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109-491: The straight-six engine (also referred to as an inline-six engine ; abbreviated I6 or L6) is a piston engine with six cylinders arranged in a straight line along the crankshaft . A straight-six engine has perfect primary and secondary engine balance , resulting in fewer vibrations than other designs of six or fewer cylinders. Until the mid-20th century, the straight-six layout was the most common design for engines with six cylinders. However, V6 engines became more common in

218-441: A crankshaft or by a swashplate or other suitable mechanism. A flywheel is often used to ensure smooth rotation or to store energy to carry the engine through an un-powered part of the cycle. The more cylinders a reciprocating engine has, generally, the more vibration-free (smoothly) it can operate. The power of a reciprocating engine is proportional to the volume of the combined pistons' displacement. A seal must be made between

327-454: A flywheel , the power from other pistons connected to the same shaft or (in a double acting cylinder ) by the same process acting on the other side of the piston. This is where the piston forms the smallest volume in the cylinder. In most types the expanded or " exhausted " gases are removed from the cylinder by this stroke . The exception is the Stirling engine , which repeatedly heats and cools

436-452: A triple in power delivery. As such, it also requires crank throws at 60° – . Such designs appear to have been limited to diesel engines such as the Detroit 71 series , marine engines, and outboard motors. Some of the 120 possible crankshaft configurations have useful properties. Still, all of them have a rocking imbalance that may or may not require a balance shaft, depending on

545-611: A 1.8 L flathead petrol engine used by the Opel 8/40 PS . The displacement of this engine was expanded as it was used in later models such as the Opel Kapitän and Opel Admiral , with later versions switching to an overhead valve (pushrod) design. In 1968, the straight-six versions of the Opel CIH engine were introduced, initially using a single overhead camshaft (SOHC) with some later versions using double overhead camshafts (DOHC). Production of

654-450: A BMW 7 Series (G11) special edition simply called "The Final V12", the last BMW series production vehicle to be fitted with a V-12 engine. On 5 October 2023 it was announced that BMW UK CEO Chris Brownridge would succeed Torsten Müller-Ötvös as the CEO of Rolls-Royce starting 1 December 2023, as a result of Müller-Ötvös retiring. BMW is an abbreviation for Bayerische Motoren Werke . This name

763-520: A V6 engine replaced it. The Nissan TB overhead valve engine was introduced in 1987 and produced alongside the other straight-six engines. The six-cylinder versions of the Prince G engine were introduced in 1963 and remained in production until 1969, three years after Prince's merger with Nissan. The 1969–1973 Nissan S20 dual overhead camshaft engine (used in the Nissan Fairlady and first generation of

872-534: A built-in balance shaft, an increased capacity to 1,170 cc (71 cu in) and enhanced performance to 75 kW (101 hp) for the R1200GS , compared to 63 kW (84 hp) of the previous R1150GS . More powerful variants of the oilhead engines are available in the R1100S and R1200S, producing 73 and 91 kW (98 and 122 hp), respectively. In 2004, BMW introduced the new K1200S Sports Bike which marked

981-597: A capacity of 1,820 L (64 cu ft), making a total capacity of 25,480 L (900 cu ft) for the largest versions. For piston engines, an engine's capacity is the engine displacement , in other words the volume swept by all the pistons of an engine in a single movement. It is generally measured in litres (l) or cubic inches (c.i.d., cu in, or in ) for larger engines, and cubic centimetres (abbreviated cc) for smaller engines. All else being equal, engines with greater capacities are more powerful and consumption of fuel increases accordingly (although this

1090-469: A cylinder to drive a reciprocating engine in a local-pollution-free urban vehicle. Torpedoes may use a working gas produced by high test peroxide or Otto fuel II , which pressurize without combustion. The 230 kg (510 lb) Mark 46 torpedo , for example, can travel 11 km (6.8 mi) underwater at 74 km/h (46 mph) fuelled by Otto fuel without oxidant . Quantum heat engines are devices that generate power from heat that flows from

1199-492: A departure for BMW. It had an engine producing 125 kW (168 hp), derived from the company's work with the Williams F1 team, and is lighter than previous K models. Innovations include electronically adjustable front and rear suspension, and a Hossack-type front fork that BMW calls Duolever. BMW introduced anti-lock brakes on production motorcycles starting in the late 1980s. The generation of anti-lock brakes available on

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1308-418: A dozen cylinders or more. Cylinder capacities may range from 10 cm or less in model engines up to thousands of liters in ships' engines. The compression ratio affects the performance in most types of reciprocating engine. It is the ratio between the volume of the cylinder, when the piston is at the bottom of its stroke, and the volume when the piston is at the top of its stroke. The bore/stroke ratio

1417-406: A hot to a cold reservoir. The mechanism of operation of the engine can be described by the laws of quantum mechanics . Quantum refrigerators are devices that consume power with the purpose to pump heat from a cold to a hot reservoir. In a reciprocating quantum heat engine, the working medium is a quantum system such as spin systems or a harmonic oscillator. The Carnot cycle and Otto cycle are

1526-535: A large number of unusual varieties of piston engines that have various claimed advantages, many of which see little if any current use: BMW The BMW Group (legally, Bayerische Motoren Werke AG , commonly abbreviated to BMW ( German pronunciation: [ˌbeːʔɛmˈveː] ), sometimes anglicized as Bavarian Motor Works ), is a German multinational manufacturer of luxury vehicles and motorcycles headquartered in Munich , Bavaria , Germany. The company

1635-518: A lower-cost version of the Oakland six, powered by the Pontiac Split-Head Six flathead engine, which used two cylinder heads. This engine was replaced by the 1941–1954 Pontiac flathead six . The unrelated Pontiac OHV 6 overhead valve engine was produced in 1964–1965, based on a Chevrolet design. Pontiac's final straight-six engine was the 1966–1969 Pontiac OHC 6 overhead camshaft engine, which

1744-572: A seal, and more heavily when higher combustion pressure moves around to their inner surfaces. It is common to classify such engines by the number and alignment of cylinders and total volume of displacement of gas by the pistons moving in the cylinders usually measured in cubic centimetres (cm or cc) or litres (l) or (L) (US: liter). For example, for internal combustion engines, single and two-cylinder designs are common in smaller vehicles such as motorcycles , while automobiles typically have between four and eight, and locomotives and ships may have

1853-480: A sequence of strokes that admit and remove gases to and from the cylinder. These operations are repeated cyclically and an engine is said to be 2-stroke , 4-stroke or 6-stroke depending on the number of strokes it takes to complete a cycle. The most common type is 4-stroke, which has following cycles. The reciprocating engine developed in Europe during the 18th century, first as the atmospheric engine then later as

1962-451: A single overhead camshaft engine in 1979 and upgraded to dual overhead camshafts before production ended in 2008 (with the 1G-FE being the final variant). Nissan's first straight-six engine was the 1950–1952 Nissan NAK flathead petrol engine, which continued in various forms until production of the Nissan P engine ended in 2003. The 1963-1965 Nissan K overhead valve petrol engine was used in

2071-586: A straight six version of the Chrysler flathead petrol engine. This was replaced by the 1959–2000 Chrysler Slant-6 overhead valve straight-six petrol engine, which was so named due to the 30-degree angle used to reduce the height of the engine (with the trade-off of a wider engine). The Slant-6 was released in the Dodge Dart economy car and used in many models until a V6 engine replaced it after 30 years. The Chevrolet Stovebolt overhead valve straight-six petrol engine

2180-414: A straight-six was the 1961–1969 Alfa Romeo 2600 executive car before the company switched to V6 engines. Mercedes-Benz's history of straight-six engines began with the 1913 Mercedes D.I aircraft engine. The first automotive straight-six engine was the 1924–1929 Daimler M836 3.9 L petrol engine. Following World War 2, Mercedes resumed production of straight-six engines with the 1951 introduction of

2289-496: Is a futuristic cauldron-shaped building, which was also designed by Karl Schwanzer and opened in 1972. The interior has a spiral theme and the roof is a 40-metre diameter BMW logo. BMW Welt , the company's exhibition space in Munich, was designed by Coop Himmelb(l)au and opened in 2007. It includes a showroom and lifting platforms where a customer's new car is theatrically unveiled to the customer. In 1975, sculptor Alexander Calder

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2398-539: Is a long-term shareholder of the company, following investments by the brothers Herbert and Harald Quandt in 1959 that saved BMW from bankruptcy , with the remaining shares owned by the public . The Otto Flugmaschinenfabrik was founded in 1910 by Gustav Otto in the Kingdom of Bavaria , which was a state of the German Empire . The firm was reorganized on 7 March 1916 into Bayerische Flugzeugwerke AG . This company

2507-685: Is grammatically incorrect (in German, compound words must not contain spaces), which is why the grammatically correct form of the name, Bayerische Motorenwerke ( German pronunciation: [ˈbaɪʁɪʃə moˈtoːʁənˌvɛʁkə] ) has been used in several publications and advertisements in the past. Bayerische Motorenwerke translates into English as Bavarian Motor Works . The suffix AG, short for Aktiengesellschaft , signifies an incorporated entity owned by shareholders, thus akin to "Inc." (US) or PLC, "Public Limited Company" (UK). The terms Beemer, Bimmer and Bee-em are sometimes used as slang for BMW in

2616-586: Is not to be confused with fuel efficiency , since high efficiency often requires a lean fuel-air ratio, and thus lower power density. A modern high-performance car engine makes in excess of 75 kW/L (1.65 hp/in ). Reciprocating engines that are powered by compressed air, steam or other hot gases are still used in some applications such as to drive many modern torpedoes or as pollution-free motive power. Most steam-driven applications use steam turbines , which are more efficient than piston engines. The French-designed FlowAIR vehicles use compressed air stored in

2725-412: Is not true of every reciprocating engine), although power and fuel consumption are affected by many factors outside of engine displacement. Reciprocating engines can be characterized by their specific power , which is typically given in kilowatts per litre of engine displacement (in the U.S. also horsepower per cubic inch). The result offers an approximation of the peak power output of an engine. This

2834-412: Is now known as BMW Motorrad . Their first successful motorcycle after the failed Helios and Flink, was the " R32 " in 1923, though production originally began in 1921. This had a " boxer " twin engine, in which a cylinder projects into the air-flow from each side of the machine. Apart from their single-cylinder models (basically to the same pattern), all their motorcycles used this distinctive layout until

2943-408: Is the German brand BMW , which has always used a straight-six layout for its six-cylinder engines. Since 2017, the trend of switching to V6 engines has reversed due to the ability to create a modular engine family of straight engines sharing many components. Examples include the 2017–present Mercedes-Benz M256 engine , the 2019–present Jaguar Land Rover Ingenium engines (AJ300 and AJ300D versions),

3052-394: Is the fictitious pressure which would produce the same amount of net work that was produced during the power stroke cycle. This is shown by: where A p {\displaystyle A_{p}} is the total piston area of the engine, S {\displaystyle S} is the stroke length of the pistons, and V d {\displaystyle V_{d}}

3161-459: Is the ratio of the diameter of the piston, or " bore ", to the length of travel within the cylinder, or "stroke". If this is around 1 the engine is said to be "square". If it is greater than 1, i.e. the bore is larger than the stroke, it is "oversquare". If it is less than 1, i.e. the stroke is larger than the bore, it is "undersquare". Cylinders may be aligned in line , in a V configuration , horizontally opposite each other, or radially around

3270-425: Is the total displacement volume of the engine. Therefore: Whichever engine with the larger value of MEP produces more net work per cycle and performs more efficiently. In steam engines and internal combustion engines, valves are required to allow the entry and exit of gases at the correct times in the piston's cycle. These are worked by cams, eccentrics or cranks driven by the shaft of the engine. Early designs used

3379-423: Is then fed through one or more, increasingly larger bore cylinders successively, to extract power from the steam at increasingly lower pressures. These engines are called compound engines . Aside from looking at the power that the engine can produce, the mean effective pressure (MEP), can also be used in comparing the power output and performance of reciprocating engines of the same size. The mean effective pressure

Straight-six engine - Misplaced Pages Continue

3488-617: The Luftstreitkräfte . It was a straight-six aircraft engine called the BMW IIIa , designed in the spring of 1917 by engineer Max Friz . Following the end of World War I, BMW remained in business by producing motorcycle engines, agricultural equipment, household items, and railway brakes. The company produced its first motorcycle, the BMW R 32 , in 1923. BMW became an automobile manufacturer in 1928 when it purchased Fahrzeugfabrik Eisenach, which, at

3597-591: The 225xe using a 1.5 L three-cylinder turbocharged petrol engine with an electric motor, the 330e / 530e using a 2.0 L four-cylinder engine with an electric motor, and the 550e / 750e using a 3.0 L six-cylinder engine with an electric motor. Also, crossover and SUV plug-in hybrid models have been released using i technology: X1 xDrive25e , X2 xDrive25e , X3 xDrive30e , and X5 xDrive40e . The BMW M GmbH subsidiary (called BMW Motorsport GmbH until 1993) started making high-performance versions of various BMW models in 1978. As of November 2024 ,

3706-611: The BMW M3 in 1986. Also in 1986, BMW introduced its first V12 engine in the 750i luxury sedan. The 1989 BMW Z1 marked BMW's return to making a two-seat roadster, the 1995 BMW Z3 was their first mass-production two-seat roadster, and the 1999 BMW X5 was the company's first entry into the SUV market. The company purchased the Rover Group in 1994, but the takeover was not successful and caused BMW large financial losses. In 2000, BMW sold off most of

3815-556: The BMW M337 (produced until 1958). Production of straight-six engines resumed in 1968 with the BMW M30 single overhead camshaft engine, built for 27 years and used in various models. The 1978–1989 BMW M88 engine was a double overhead camshaft design that was introduced in the BMW M1 mid-engine sport car. BMW's introduction of turbocharged straight-six engines (aside from the low-volume variants of

3924-452: The D slide valve but this has been largely superseded by piston valve or poppet valve designs. In steam engines the point in the piston cycle at which the steam inlet valve closes is called the cutoff and this can often be controlled to adjust the torque supplied by the engine and improve efficiency. In some steam engines, the action of the valves can be replaced by an oscillating cylinder . Internal combustion engines operate through

4033-498: The Duramax Straight-6 turbocharged diesel engine has been available in several General Motors SUV and light truck models since 2020. On March 25, 2022, Stellantis announced their new turbocharged straight-six engine, called Hurricane. Two outputs are available, a standard 400 or 500 hp (298 or 373 kW; 406 or 507 PS) high performance rated at 450 or 475 pound force-feet (610 or 644 N⋅m) of torque. The turbos on

4142-522: The Ford 240 I6 from 1965 through 1972. The Ford 300 cu in (4.9 L) version of the straight-six engine was built from 1965 until 1996, with notable uses in trucks, SUVs, and vans. However, Ford straight-sixes were replaced by V6 engines in passenger cars during the mid-1970s. In 1908, the Oldsmobile Model Z was powered by a flathead straight-six petrol engine, which was produced until 1912 (in

4251-652: The Ford Falcon large sedan was introduced with a locally-built version of the American Ford Straight-6 overhead valve engine. In 1998, these engines were upgraded to a single overhead camshaft design. This was followed in 2002 by the Ford Barra dual overhead camshaft engine in 2002, which was produced in both naturally aspirated and turbocharged versions. The Ford Barra engine remained in use until Ford Australia ceased local production in 2016. The Chrysler Valiant

4360-477: The K Series , shaft drive but water-cooled and with either three or four cylinders mounted in a straight line from front to back. Shortly after, BMW also started making the chain-driven F and G series with single and parallel twin Rotax engines. In the early 1990s, BMW updated the airhead Boxer engine which became known as the oilhead . In 2002, the oilhead engine had two spark plugs per cylinder. In 2004 it added

4469-661: The Mercedes-Benz M180 overhead camshaft engine. In 1985, the Mercedes-Benz OM603 3.0 L diesel straight-six engine was introduced. In 1996, the company replaced its petrol straight-sixes with a series of V6 engines, although it continued producing diesel straight-six engines. Production of petrol straight-six engines resumed in 2017 with the introduction of the Mercedes-Benz M256 turbocharged DOHC engine. Opel began production of straight-six engines in 1927 with

Straight-six engine - Misplaced Pages Continue

4578-637: The Nissan Cedric Special 50 luxury car. Using a similar design, the Nissan H30 engine was used in several luxury cars from 1965 through 1989. In 1966, Nissan began production of the six-cylinder versions of the Nissan L single overhead camshaft engine, which was produced until 2009. The 1985–2004 Nissan RB engine , used in the Nissan Skyline and several other cars, was produced in single overhead camshaft and dual overhead camshaft configurations until

4687-687: The Nissan Skyline GT-R ) was based on the Prince G engine. Mitsubishi produced six-cylinder versions of the Mitsubishi KE engine from 1963 to 1970, as well as the rare six-cylinder versions of the Mitsubishi 6G34 version of the single overhead camshaft "Saturn" engine from 1970 to 1976. The 2000–2006 Daewoo Magnus (also called the Chevrolet Evanda, Chevrolet Epica, Holden Epica, or Suzuki Verona)

4796-523: The Oldsmobile Limited luxury car) in displacements of 453 cu in (7.4 L), 505 cu in (8.3 L) and 706 cu in (11.6 L). Oldsmobile's next straight-six engine was introduced in the 1913 Oldsmobile Six luxury car, initially with a displacement of 380 cu in (6.2 L), followed by a displacement of 177 cu in (2.9 L) for the 1917-1921 Oldsmobile Model 37 luxury car. The later generations of

4905-521: The Oldsmobile Straight-6 also used a flathead design from its introduction in the 1923 Oldsmobile Model 30 luxury car until it was replaced in 1950 by Oldsmobile's V8 engine. The 1913–1929 Oakland Six luxury car was powered by a flathead petrol engine produced in displacements of 177 cu in (2.9 L) and 334 cu in (5.5 L). In 1926, the Pontiac Six was introduced as

5014-616: The World Intellectual Property Organization (WIPO) ’s Madrid Yearly Review ranked BMW's number of marks applications filled under the Madrid System as 2nd in the world, with 124 trademarks applications submitted during 2023. The key trends of the BMW Group are (as at the financial year ending December 31): BMW began production of motorcycle engines and then motorcycles after World War I. Its motorcycle brand

5123-445: The X Series SUVs and crossovers are: The current model line of the Z Series two-door roadsters is the Z4 (model code G29 ). All-electric vehicles and plug-in hybrid vehicles are sold under the BMW i sub-brand. The current model range consists of: In addition, several plug-in hybrid models built on existing platforms have been marketed as iPerformance models. Examples include

5232-420: The steam engine . These were followed by the Stirling engine and internal combustion engine in the 19th century. Today the most common form of reciprocating engine is the internal combustion engine running on the combustion of petrol , diesel , liquefied petroleum gas (LPG) or compressed natural gas (CNG) and used to power motor vehicles and engine power plants . One notable reciprocating engine from

5341-663: The 1938 Jaguar 3½ Litre sports saloon/coupe and the 1948 Jaguar Mark V luxury car. The 1927 Rover Two-litre luxury car introduced the company's IOE straight-six petrol engine. This engine was used in various Rover models until the Rover P5 was discontinued in 1973, and in various Land Rover models from the 1961 Land Rover Series IIA until 1980 Land Rover Series III . The 1928 Austin 20/6 luxury car introduced Austin's flathead straight-six petrol engine. The 1938-1939 Austin Twenty-Eight used an enlarged version of this engine. This

5450-509: The 1960s, BMW expanded its range by adding coupé and luxury sedan models. The BMW 5 Series mid-size sedan range was introduced in 1972, followed by the BMW 3 Series compact sedans in 1975, the BMW 6 Series luxury coupés in 1976 and the BMW 7 Series large luxury sedans in 1978. The BMW M division released its first road car, a mid-engine supercar, in 1978. This was followed by the BMW M5 in 1984 and

5559-473: The 1970s. By the 2000s, V6 engines replaced most straight-six engines. In terms of packaging, straight-six engines are almost always narrower than a V6 engine or V8 engine , but longer than straight-four engines , V6s, and most V8s. Straight-six engines are typically produced in displacements ranging from 2 to 4 L (122 to 244 cu in), however engines ranging in size from the 0.7 L (43 cu in) Benelli 750 Sei motorcycle engine to

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5668-454: The 1998–2006 Volvo S80 ) used the uncommon design of a transversely-mounted straight-six engine. Production of Volvo straight-six engines ceased in 2015. BMW's first product was the 1917 BMW IIIa straight-six aircraft engine. The company began production of automotive straight-six engines in 1933 with the BMW M78 petrol engine, a 1.2 L overhead valve design that evolved over the years into

5777-443: The 2006 and later BMW motorcycles paved the way for the introduction of electronic stability control , or anti-skid technology later in the 2007 model year. BMW has been an innovator in motorcycle suspension design, taking up telescopic front suspension long before most other manufacturers. Then they switched to an Earles fork , front suspension by swinging fork (1955 to 1969). Most modern BMWs are truly rear swingarm, single sided at

5886-559: The 2021–present Stellantis Hurricane engine and the 2022–present Mazda Skyactiv-X and Skyactiv-D engines. Alfa Romeo's first production straight-six engine - 6.3 L flathead petrol engine - was introduced in 1921 in the Alfa Romeo G1 luxury car. An overhead valve design was introduced in the 1922 Alfa Romeo RL sports car, and an overhead camshaft design was used in the 1927 Alfa Romeo 6C sports car and various racing cars from 1927 until 1954. The last Alfa Romeo model using

5995-408: The 6.7 L (409 cu in) Cummins B Series engine pickup truck engine have also been produced. Due to its well-balanced configuration, the straight-six can be scaled up to substantial sizes for heavy trucks, locomotives, industrial and marine use. If an appropriate firing order is used, a straight-six engine has perfect primary and secondary engine balance . The primary balance is due to

6104-770: The 6th largest by revenue. In 2023, the company was ranked 46th in the Forbes Global 2000 . The company has significant motor-sport history, especially in touring cars , sports cars , and the Isle of Man TT . BMW is headquartered in Munich and produces motor vehicles in Germany, the United Kingdom, the Netherlands (ceased in 2023), the United States, Brazil, Mexico, South Africa, India and China. The Quandt family  [ de ]

6213-458: The English language and are sometimes used interchangeably for cars and motorcycles. The circular blue and white BMW logo or roundel evolved from the circular Rapp Motorenwerke company logo, which featured a black ring bearing the company name surrounding the company logo, an image of a horse head on a plinth. BMW retained Rapp's black ring inscribed with the company name, but the interior of

6322-700: The Hurricane Standard Output deliver a peak boost of 22 psi, while the Hurricane High Output turbos deliver 26 psi of peak boost. The 3.0 L Hurricane is produced at Stellantis’ Saltillo Engine Plant in Mexico. Toyota's first straight-six engine was the Toyota Type A , produced from 1935 through 1947. The Type A was an overhead-valve petrol engine based on the Chevrolet Stovebolt engine. This

6431-530: The M lineup is: The letter "M" is also often used in the marketing of BMW's regular models, for example the F20 M140i model, the G11 M760Li model and various optional extras called "M Sport", "M Performance" or similar. BMW has a long history of motorsport activities, including: The global BMW Headquarters in Munich represents the cylinder head of a 4-cylinder engine . It was designed by Karl Schwanzer and

6540-495: The M30 engine in the 1980s) was in 2006 BMW N54 and the production of naturally aspirated engines ceased in 2015. As of 2022, the BMW B58 turbocharged straight-six engine remains in production, along with its higher performance BMW S58 variants. Rolls-Royce's first straight-six engine was a 6.0 L IOE petrol engine, which was used in the 1905 Rolls-Royce 30 hp luxury car. This car

6649-643: The Opel CIH engine continued until 1993, when a V6 engine replaced it. Volvo began production of straight-six engines with the 1929–1958 Penta DB flathead petrol engines. The company resumed production in 1969 with the Volvo B30 overhead valve petrol engine, followed by the straight-six versions of the Volvo Modular Engine introduced in 1995 and then the Volvo SI6 engine introduced in 2006. Several models (such as

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6758-550: The Rover brands, retaining only the Mini brand. In 1998, BMW also acquired the rights to the Rolls-Royce brand from Vickers . The first modern mass-produced turbocharged petrol engine was introduced in 2006 (from 1973 to 1975, BMW built 1,672 units of a turbocharged BMW M10 engine for the BMW 02 Series ), with most engines switching over to turbocharging over the 2010s. The first hybrid BMW

6867-483: The World War II era was the 28-cylinder, 3,500  hp (2,600 kW) Pratt & Whitney R-4360 Wasp Major radial engine. It powered the last generation of large piston-engined planes before jet engines and turboprops took over from 1944 onward. It had a total engine capacity of 71.5 L (4,360 cu in), and a high power-to-weight ratio . The largest reciprocating engine in production at present, but not

6976-523: The application. The six pistons with six unique phases cannot be "paired" as in the four-stroke case. The Detroit engines used a configuration that, once the primary rocking couple was balanced out, was also perfectly balanced at all other rocking couples until the 6th order. Mercury came to use a configuration that canceled only the primary rocking couple and was run without a balancer. The reciprocating masses of all configurations are still imbalanced at only 6th-order and up in their plane of motion. Still,

7085-556: The back (compare with the regular swinging fork usually, and wrongly, called swinging arm ). Some BMWs started using yet another trademark front suspension design, the Telelever, in the early 1990s. Like the Earles fork, the Telelever significantly reduces dive under braking. BMW Group, on 31 January 2013, announced that Pierer Industrie AG has bought Husqvarna Motorcycles for an undisclosed amount, which will not be revealed by either party in

7194-465: The balance of kinetic energy exchange between pistons has improved to a residual 6th-order-and-up inertial torque oscillation compared with the four-stroke design being imbalanced at 3rd-order and up. Crankshafts for straight-six engines usually have either four main bearings (i.e., a bearing in between each pair of crankpins and one at each end) or seven main bearings (i.e., a bearing between every crankpin): The first production straight-six engine

7303-493: The black outline encircling the rondel. The logo is used for BMW's branding communications but it is not used on vehicles. The slogan 'The Ultimate Driving Machine' was first used in North America in 1974. In 2010, this long-lived campaign was mostly supplanted by a campaign intended to make the brand more approachable and to better appeal to women, 'Joy'. By 2012 BMW had returned to 'The Ultimate Driving Machine'. In 2023,

7412-828: The company was nearly taken over by rival Daimler-Benz. A large investment in BMW by Herbert Quandt and Harald Quandt resulted in the company surviving as a separate entity. Günther Quandt , was a well-known German industrialist, joined the Nazi party in 1933 and made a fortune arming the German Wehrmacht, manufacturing weapons and batteries. Many of his enterprises were appropriated from Jewish owners under duress with minimal compensation. At least three of his enterprises made extensive use of slave laborers, as many as 50,000 in all. One of his battery factories had its own on-site concentration camp, complete with gallows. Life expectancy for laborers

7521-470: The crankshaft. Opposed-piston engines put two pistons working at opposite ends of the same cylinder and this has been extended into triangular arrangements such as the Napier Deltic . Some designs have set the cylinders in motion around the shaft, such as the rotary engine . In some steam engines, the cylinders may be of varying size with the smallest bore cylinder working the highest pressure steam. This

7630-430: The cylinder either by ignition of a fuel air mixture ( internal combustion engine ) or by contact with a hot heat exchanger in the cylinder ( Stirling engine ). The hot gases expand, pushing the piston to the bottom of the cylinder. This position is also known as the bottom dead center (BDC), or where the piston forms the largest volume in the cylinder. The piston is returned to the cylinder top (top dead center) (TDC) by

7739-529: The early 1980s. Many BMW's are still produced in this layout, which is designated the R Series . The entire BMW Motorcycle production has, since 1969, been located at the company's Berlin-Spandau factory. During the Second World War, BMW produced the BMW R75 motorcycle with a motor-driven sidecar attached, combined with a lockable differential , this made the vehicle very capable off-road. In 1982, came

7848-437: The front and rear trio of cylinders moving in pairs (albeit 360° out of phase), thus canceling out the rocking motion present in a straight-three engine . The secondary balance is due to the crank throws being arranged in three planes offset at 120°, resulting in the non-sinusoidal forces summing to zero for all free forces until the sixth order. The engine balance characteristics of a straight-six engine compare favorably with

7957-432: The future. The company is headed by Stephan Pierer (CEO of KTM). Pierer Industrie AG is 51% owner of KTM and 100% owner of Husqvarna. In September 2018, BMW unveiled a new self-driving motorcycle with BMW Motorrad with a goal of using the technology to help improve road safety. The design of the bike was inspired by the company's BMW R1200 GS model. The current model lines of BMW cars are: The current model lines of

8066-457: The head of the BMW Group. In January 2021, BMW announced that its sales in 2020 fell by 8.4 percent due to the impact of COVID-19 pandemic restrictions. However, in the fourth quarter of 2020, BMW witnessed a rise of 3.2% in its customers' demands. This recovery was supported by the company's adoption of widely accepted technologies and integration of third-party services such as Apply Pay and on-demand music. On 18 January 2022 BMW announced

8175-588: The largest ever built, is the Wärtsilä-Sulzer RTA96-C turbocharged two-stroke diesel engine of 2006 built by Wärtsilä . It is used to power the largest modern container ships such as the Emma Mærsk . It is five stories high (13.5 m or 44 ft), 27 m (89 ft) long, and weighs over 2,300 metric tons (2,535 short tons ; 2,264 long tons ) in its largest 14 cylinders version producing more than 84.42 MW (113,209 bhp). Each cylinder has

8284-404: The logo is based on the image of an airplane propeller spinning in a blue sky. This myth likely stems from a 1929 BMW advertisement that depicted the logo superimposed on a rotating propeller. However, the logo predates that advertisement by 12 years. The current iteration of the logo was introduced in 2020, removing 3D effects that had been used in previous renderings of the logo while removing

8393-447: The more common straight-four engines and V6 engines , which experience significant secondary dynamic imbalance, resulting in engine vibration. As engine reciprocating forces increase with the cube of piston bore, the straight-six is a preferred configuration for large truck engines. An even-firing six-cylinder two-stroke engine requires ignitions at 60° intervals, or else it would run with simultaneous ignitions and be no smoother than

8502-410: The ones most studied. The quantum versions obey the laws of thermodynamics . In addition, these models can justify the assumptions of endoreversible thermodynamics . A theoretical study has shown that it is possible and practical to build a reciprocating engine that is composed of a single oscillating atom. This is an area for future research and could have applications in nanotechnology . There are

8611-440: The ring is quartered blue and white, reminiscent of the coat of arms and flag of Bavaria (which in turn are based on the arms of the historic House of Wittelsbach , which ruled Bavaria for many centuries). The logo does not bear the distinctive lozenge shape found on the coat of arms, however, as local laws at the time it was introduced forbade the use of state coats of arms on commercial logos. A persistent myth claims that

8720-499: The same sealed quantity of gas. The stroke is simply the distance between the TDC and the BDC, or the greatest distance that the piston can travel in one direction. In some designs the piston may be powered in both directions in the cylinder, in which case it is said to be double-acting . In most types, the linear movement of the piston is converted to a rotating movement via a connecting rod and

8829-407: The sliding piston and the walls of the cylinder so that the high pressure gas above the piston does not leak past it and reduce the efficiency of the engine. This seal is usually provided by one or more piston rings . These are rings made of a hard metal, and are sprung into a circular groove in the piston head. The rings fit closely in the groove and press lightly against the cylinder wall to form

8938-450: The time, built the Austin 7 under licence from Dixi . The first car sold as a BMW was a rebadged BMW Dixi called the BMW 3/15 , following BMW's acquisition of the car manufacturer Automobilwerk Eisenach. Throughout the 1930s, BMW expanded its range into sports cars and larger luxury cars. Aircraft engines, motorcycles, and automobiles would be BMW's main products until World War II. During

9047-434: The war, BMW concentrated on the BMW 801 aircraft engine using as many as 40,000 slave laborers. These consisted primarily of prisoners from Nazi concentration camps , most prominently Dachau . Motorcycles remained as a side-line and automobile manufacture ceased altogether. BMW's factories were heavily bombed during the war and its remaining West German facilities were banned from producing motor vehicles or aircraft after

9156-481: The war. Again, the company survived by making pots, pans, and bicycles. In 1948, BMW restarted motorcycle production. BMW resumed car production in Bavaria in 1952 with the BMW 501 luxury saloon. The range of cars was expanded in 1955, through the production of the cheaper Isetta microcar under licence. Slow sales of luxury cars and small profit margins from microcars, meant BMW was in serious financial trouble and in 1959

9265-511: Was commissioned to paint the BMW 3.0 CSL racing car driven by Hervé Poulain at the 24 Hours of Le Mans, which became the first in the series of BMW Art Cars. Since Calder's work of art, many other renowned artists throughout the world have created BMW Art Cars, including David Hockney , Jenny Holzer , Roy Lichtenstein , Robert Rauschenberg , Frank Stella , and Andy Warhol . To date, a total of 19 BMW Art Cars, based on both racing and regular production vehicles, have been created. BMW sponsors

9374-406: Was completed in 1972. The building has become a European icon and was declared a protected historic building in 1999. The main tower consists of four vertical cylinders standing next to and across from each other. Each cylinder is divided horizontally in its center by a mold in the facade. Notably, these cylinders do not stand on the ground; they are suspended on a central support tower. BMW Museum

9483-460: Was followed by an IOE version in 1916. The 1951 Hudson Hornet introduced a 308 cu in (5.0 L) flathead straight-six engine. These engines dominated dirt track and NASCAR racing at the time. Production of the Hudson I6 continued after the 1954 merger forming American Motors Corporation and was eventually replaced by a new Rambler V8 after 1956. In 1924, Chrysler began production of

9592-574: Was followed by the AJ6 and AJ16 engines, produced from 1984 to 1996, before being replaced by a Ford-derived V6 engine. The 1948–1959 Lagonda straight-6 dual overhead camshaft petrol engine was used in various Aston Martin and Lagonda cars. This engine's successor was the Tadek Marek-designed straight-six used in the DB4 (1958), DB5 (1963), DB6 (1965) and DBS (1967). The Ford Zephyr 6 overhead valve engine

9701-411: Was followed by the 1962–1988 Chevrolet Turbo-Thrift engine (also using an overhead valve design), which was replaced by various General Motors V6 engines. The 1952 through 2006 AMC Straight-6 petrol engine initially used a flathead design before being upgraded to an overhead valve design in 1956. A new I6 design with a short stroke and seven main bearing crankshaft was introduced in 1964. The engine

9810-423: Was followed by the first generation Toyota F overhead valve engine, which was produced from 1949 to 1975, which in turn was followed by the 2F version from 1975 to 1988 and the fuel-injected 3F / 3FE version from 1988 to 1992. This was replaced by the dual overhead camshaft Toyota FZ engine , produced from 1993 until 2008. Produced alongside these engines was the single overhead camshaft Toyota M engine , which

9919-582: Was founded in 1916 as a manufacturer of aircraft engines , which it produced from 1917 to 1918 and again from 1933 to 1945 creating engines for aircraft that were used in the Second World War . The companies automobiles are marketed under the BMW, Mini and Rolls-Royce brands, and motorcycles are marketed under the BMW Motorrad brand. Also in 2023, BMW was the world's ninth-largest producer of motor vehicles , with 2,555,341 vehicles produced and in 2023

10028-525: Was introduced in 1929 as a replacement for the brand's straight-four engines and was produced in displacements of 181 cu in (3.0 L), 194 cu in (3.2 L) and 207 cu in (3.4 L). The second generation of this engine family - often referred to as the Blue Flame engine - was produced from 1937 to 1962 in displacements of 216 cu in (3.5 L), 235 cu in (3.9 L) and 261 cu in (4.3 L). This

10137-625: Was introduced in 1962, powered by the American Chrysler Slant 6 . In 1970, the Valiant switched to the Chrysler Hemi-6 overhead valve engine, an Australia-only engine that was produced until Chrysler Australia ceased production of large cars in 1981. Piston engine There may be one or more pistons. Each piston is inside a cylinder , into which a gas is introduced, either already under pressure (e.g. steam engine ), or heated inside

10246-407: Was introduced in 1965 and produced over seven generations until 1993 (with the 7M-GTE being the final version of the M engine). The M engine was replaced by the dual overhead camshaft Toyota JZ engine , which was produced from 1990 to 2007 and is arguably known as Toyota's best straight-six engine. Toyota's third line of straight-six engines was the 2.0 L Toyota G engine , which was released as

10355-643: Was introduced in the Willys Jeep Station Wagon . At the time of its introduction, the Tornado engine had the lowest specific fuel consumption of an American gasoline (petrol) engine. The Tornado engine was replaced by the AMC I6 engine. In 2001, General Motors resumed production of straight-six engines with the Vortec 4200 dual overhead camshaft petrol engine. This engine was used in various SUV models until 2009. Also,

10464-632: Was introduced in the Dutch Spyker 60 HP racing car in 1903. Straight-six engines increased in popularity in the years after and by 1909, approximately 80 manufacturers were using them (including 62 in the United Kingdom). Prior to the 1950s, V6 engines were rarely used, due to the poorer engine balance of V6 engines compared to straight-six engines. Since the 1980s, however, the shorter length of V6 engines has seen most manufacturers replace straight-six engines with V6 engines. An exception to this trend

10573-521: Was powered by a 1.3-1.6 L overhead camshaft straight-six petrol engine. The 1931–1932 MG F-type tourers, 1932–1934 MG K-type sports cars, and 1934–1936 MG N-type sports cars were powered by an overhead camshaft straight-six petrol engine. During the mid-1930s, the Riley MPH sports car and Riley Kestrel 6 saloon were produced in small numbers and were powered by dual overhead camshaft straight-six petrol engine. The 1947 Bristol 400 luxury car

10682-597: Was powered by an overhead valve straight-six petrol engine based on the design of the BMW M328 engine. This engine remained in use until the Bristol 406 was discontinued in 1961. The dual overhead camshaft Jaguar XK6 engine petrol engine was produced from 1948 to 1992 in the Jaguar XK120 sports car. Introduced as a 3.4 L, it was used in passenger and racing cars, produced in displacements of 2.4 to 4.2 L. The XK6 engine

10791-558: Was powered by the Daewoo XK6 straight-six petrol engine, which is one of the few straight-six engines to be used in a transverse engine front-wheel drive car. From the 1950s to the 2010s, many cars produced in Australia were powered by a straight-six engine. Holden's first car, the 1948 Holden 48-215 sedan, was powered by the Holden 'grey' motor , an overhead valve petrol engine. This engine

10900-419: Was replaced by Chevrolet's straight-six engine and Buick's V6 engine. a The overhead valve Buick Straight-6 petrol engine was introduced in the 1914 Buick Six luxury car and was produced until 1930. Buick did not make another six-cylinder engine until they introduced a V6 engine in 1962. The 1916 through 1926 Hudson Super Six was powered by a 289 cu in (4.7 L) straight-six petrol engine. This

11009-591: Was replaced by the Austin D-Series engine , an overhead valve engine initially designed for trucks, which was used in passenger cars from 1947 until 1968 (along with several Jensen Motors models from 1946 to 1962). The overhead valve BMC C-Series was used by various BMC brands from 1954 to 1971, followed by the 2.2 L version of the BMC E-Series overhead camshaft engine, which was produced from 1970 until 1982. The 1930–1936 Wolseley Hornet six lightweight car

11118-521: Was replaced by the Holden 'red' motor , which was produced from 1963 to 1980 and in turn followed by the 1980–1984 Holden 'blue' motor . The final locally produced Holden straight-six was the 1984–1986 Holden 'black' motor , which was initially replaced by the Japanese-built Nissan RB30 engine before Holden switched to a locally-built V6 engine. Ford produced straight-six engines for the longest time of any Australian manufacturer. In 1960,

11227-472: Was replaced by the 1906–1926 Rolls-Royce Silver Ghost , which switched to a flathead (side-valve) design for its straight-six engine. In 1906, the Standard Six luxury car was introduced, powered by a 20 hp (15 kW; 20 PS) I6 petrol engine. Standard's engines were also used in several cars built by SS Cars and its successor Jaguar, such as the 1932 SS 1 sports car, the 1936 SS Jaguar 100 and

11336-457: Was rugged, reliable, and became noted for longevity. A turbocharged racing engine based on the AMC Straight-6 engine block produced 875 hp (652 kW) and competed in the 1978 Indianapolis 500 race. The final application for the AMC Straight-6 engine was the 2006 Jeep Wrangler (TJ) , after which a V6 replaced it. The 1962 through 1973 Jeep Tornado overhead camshaft straight-six engine

11445-606: Was six months. While Quandt and BMW were not directly connected during the war, funds amassed in the Nazi era by his father allowed Herbert Quandt to buy BMW. The relative success of the small BMW 700 assisted in the company's recovery, allowing them to develop the New Class sedans. The 1962 introduction of the BMW New Class compact sedans was the beginning of BMW's reputation as a leading manufacturer of sport-oriented cars. Throughout

11554-560: Was the 2010 BMW ActiveHybrid 7 , and BMW's first mass-production electric car was the BMW i3 city car, which was released in 2013, (from 1968 to 1972, BMW built two battery-electric BMW 1602 Elektro saloons for the 1972 Olympic Games). After many years of establishing a reputation for sporting rear-wheel drive cars, BMW's first front-wheel drive car was the 2014 BMW 2 Series Active Tourer multi-purpose vehicle (MPV) . In March 2018, Daimler and BMW merged their mobility services. In August 2019, Oliver Zipse replaced Harald Krüger as

11663-415: Was then renamed to Bayerische Motoren Werke (BMW) in 1922. However, the name BMW dates back to 1913, when a company to use the name was founded by Karl Rapp initially as Rapp Motorenwerke . The name and Rapp Motorenwerke 's engine-production assets were transferred to Bayerische Flugzeugwerke in 1922, who adopted the name the same year. BMW's first product was produced for fighter aircraft of

11772-560: Was used in several of the company's sports cars. The 1906–1908 Ford Model K luxury car used a 405 cu in (6.6 L) straight-six petrol engine and was the only Ford six-cylinder passenger car engine until the 1940s. The Ford flathead I6 was produced from 1941 until 1951, followed by the Ford OHV I6 overhead valve engine from 1952 through 1964, then the Ford Thriftpower Six overhead valve engine from 1960 until 1982, and

11881-716: Was used in the Ford Zephyr executive car and several other models from 1951 to 1966. The Triumph I6 overhead valve straight-six petrol engine was produced from 1960 to 1977 and debuted in the Standard Vanguard Six sports saloon. The Leyland PE166 engine was loosely based on the Triumph design and was produced from 1977 to 1986. The 1972–1977 TVR 2500M sports car was powered by the Triumph I6 engine. Then, from 1999 to 2007, TVR's own TVR Speed Six dual overhead camshaft engine

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