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94-527: The origins of the 'NR' series of motorcycles lie in Honda's return to Grand Prix motorcycle racing in the late 1970s following an absence since their highly successful participation in the 1960s. During the absence of Honda, Grand Prix racing came to be dominated by two-stroke machines that could easily attain a higher specific output than a four-stroke equivalent. Honda had long preferred to concentrate on four-stroke development and therefore decided to produce such

188-447: A flathead engine a push rod is not necessary. The overhead cam design typically allows higher engine speeds because it provides the most direct path between cam and valve. Valve clearance refers to the small gap between a valve lifter and a valve stem that ensures that the valve completely closes. On engines with mechanical valve adjustment, excessive clearance causes noise from the valve train. A too-small valve clearance can result in

282-537: A 'spec' tyre supplier, Bridgestone, was appointed by the FIM (with Michelin no longer supplying any tyres to MotoGP and returning to the category in 2016). For the whole season Bridgestone provided four specifications of front tyre, six of rear, and a single wet specification—with no qualifying specification. For each round Bridgestone provided only two specifications for front and rear. Tyres are assigned to riders randomly to assure impartiality. Jorge Lorenzo has publicly supported

376-542: A 250 cc V-twin using a supercharger and the 8-valve oval piston technology was developed but never seen in public. The oval piston concept continued in the NR750 endurance bike, which made a brief appearance during the 1980s. Finally the technology was transferred to the road, at least on a limited basis, with the bike simply referred to as the Honda NR. This is usually distinguished by using Honda's internal model code of RC40. One of

470-474: A 350cc class from 1949 to 1982, and a 750cc class from 1977 to 1979. Sidecars were dropped from world championship events in the 1990s (see Sidecar World Championship ). From the mid-1970s through to 2001, the top class of GP racing allowed 500cc displacement with a maximum of four cylinders, regardless of whether the engine was a two-stroke or four-stroke . This is unlike TT Formula or motocross , where two and four strokes had different engine size limits in

564-406: A company known as Daimler Motoren Gesellschaft . Today, that company is Daimler-Benz . The Atkinson-cycle engine is a type of single stroke internal combustion engine invented by James Atkinson in 1882. The Atkinson cycle is designed to provide efficiency at the expense of power density , and is used in some modern hybrid electric applications. The original Atkinson-cycle piston engine allowed

658-525: A double-acting engine that ran on illuminating gas at 4% efficiency. The 18 litre Lenoir Engine produced only 2 horsepower. The Lenoir engine ran on illuminating gas made from coal, which had been developed in Paris by Philip Lebon . In testing a replica of the Lenoir engine in 1861, Otto became aware of the effects of compression on the fuel charge. In 1862, Otto attempted to produce an engine to improve on

752-508: A factory team buying ("claiming") their rival's powertrain for a fixed price. The sport's governing body received applications from sixteen new teams looking to join the MotoGP class. For the 2014 season, the CRT subclass was rebranded Open, as the claiming rule was removed. Also, all entries adopted a standard engine control unit, with factory teams being allowed to run any software, and Open entries using

846-472: A four-cylinder. This was achieved by designing an oval piston that allowed a total of 8 valves per cylinder, and connecting two con-rods to each piston. Such a configuration led to almost unprecedented complexity in terms of engine design, with 32 valves and eight con-rods incorporated into the dimensions of a regular four-cylinder motorcycle engine. Development and testing of the new engine proved fraught with difficulty (prompting some motorcycle journalists of

940-405: A machine to challenge their Japanese rivals. To achieve this aim Honda could have looked to follow their 1960s practice of increasing the number of cylinders to produce more power. However, Grand Prix rules at the time required a configuration with maximum of four combustion chambers. Honda engineers therefore came up with the highly innovative solution of constructing a 'V8' engine in the form of

1034-556: A range of technologies and design features that have now appeared on more common models. In 2008 Cologne Motorcycle Show , Honda unveiled a V4 Concept Model to celebrate the company's 60th anniversary. Grand Prix motorcycle racing Grand Prix motorcycle racing is the highest class of motorcycle road racing events held on road circuits sanctioned by the Fédération Internationale de Motocyclisme (FIM). Independent motorcycle racing events have been held since

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1128-503: A standard software. For the 2016 season, the Open subclass was dropped, and factory entries switched to a standard engine control unit software. In 2010, the 250cc two-stroke class was replaced by the new Moto2 600cc four-stroke class. In 2012, the 125cc two-stroke class was replaced by the Moto3 250cc four-stroke class with a weight limit of 65 kg with fuel. For the 2019 season Moto2 introduced

1222-451: A successful atmospheric engine that same year. The factory ran out of space and was moved to the town of Deutz , Germany in 1869, where the company was renamed to Deutz Gasmotorenfabrik AG (The Deutz Gas Engine Manufacturing Company). In 1872, Gottlieb Daimler was technical director and Wilhelm Maybach was the head of engine design. Daimler was a gunsmith who had worked on the Lenoir engine. By 1876, Otto and Langen succeeded in creating

1316-475: A traditional piston engine. While Atkinson's original design is no more than a historical curiosity, many modern engines use unconventional valve timing to produce the effect of a shorter compression stroke/longer power stroke, thus realizing the fuel economy improvements the Atkinson cycle can provide. The diesel engine is a technical refinement of the 1876 Otto-cycle engine. Where Otto had realized in 1861 that

1410-579: A turbine system that converted waste heat into kinetic energy that it fed back into the engine's transmission. In 2005, BMW announced the development of the turbosteamer , a two-stage heat-recovery system similar to the Mack system that recovers 80% of the energy in the exhaust gas and raises the efficiency of an Otto engine by 15%. By contrast, a six-stroke engine may reduce fuel consumption by as much as 40%. Modern engines are often intentionally built to be slightly less efficient than they could otherwise be. This

1504-399: Is 148 kg (326 lb). Traditionally, the age limits for Moto3 were 16-28, with an upper limit of 25 for new contracted riders participating for the first time and wild-cards. A change of rules was introduced in 2014, allowing under-age FIM CEV Repsol Moto3 (junior) champions to participate in a subsequent Moto3 series at World Championship level. The first beneficiary of this rule-change

1598-464: Is 765cc displacement with three cylinders, contrasting with the previous Honda's 600cc in-line four. In 2024 Pirelli became the sole tire supplier in Moto2 and Moto3, replacing Dunlop. The 125cc class was replaced in 2012 by the Moto3 class. This class is restricted to single-cylinder 250cc four-stroke engines with a maximum bore of 81 mm (3.2 inches). The minimum total weight for motorcycle and rider

1692-413: Is a contact surface on which the cam slides to open the valve. Many engines use one or more camshafts "above" a row (or each row) of cylinders, as in the illustration, in which each cam directly actuates a valve through a flat tappet. In other engine designs the camshaft is in the crankcase , in which case each cam usually contacts a push rod , which contacts a rocker arm that opens a valve, or in case of

1786-463: Is closer to the top. Diesel engines by their nature do not have concerns with pre-ignition. They have a concern with whether or not combustion can be started. The description of how likely Diesel fuel is to ignite is called the Cetane rating. Because Diesel fuels are of low volatility, they can be very hard to start when cold. Various techniques are used to start a cold Diesel engine, the most common being

1880-536: Is limited by the chemical composition of the fuel. There are several grades of fuel to accommodate differing performance levels of engines. The fuel is altered to change its self ignition temperature. There are several ways to do this. As engines are designed with higher compression ratios the result is that pre-ignition is much more likely to occur since the fuel mixture is compressed to a higher temperature prior to deliberate ignition. The higher temperature more effectively evaporates fuels such as gasoline, which increases

1974-590: Is necessary for emission controls such as exhaust gas recirculation and catalytic converters that reduce smog and other atmospheric pollutants. Reductions in efficiency may be counteracted with an engine control unit using lean burn techniques . In the United States, the Corporate Average Fuel Economy mandates that vehicles must achieve an average of 34.9 mpg ‑US (6.7 L/100 km; 41.9 mpg ‑imp ) compared to

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2068-431: Is not immediately available due to the need to sharply increase engine RPM, to build up pressure and to spin up the turbo, before the turbo starts to do any useful air compression. The increased intake volume causes increased exhaust and spins the turbo faster, and so forth until steady high power operation is reached. Another difficulty is that the higher exhaust pressure causes the exhaust gas to transfer more of its heat to

2162-400: Is that the temperature rise of the compressed charge can cause pre-ignition. If this occurs at the wrong time and is too energetic, it can damage the engine. Different fractions of petroleum have widely varying flash points (the temperatures at which the fuel may self-ignite). This must be taken into account in engine and fuel design. The tendency for the compressed fuel mixture to ignite early

2256-412: Is ultimately limited by material strength and lubrication . Valves, pistons and connecting rods suffer severe acceleration forces. At high engine speed, physical breakage and piston ring flutter can occur, resulting in power loss or even engine destruction. Piston ring flutter occurs when the rings oscillate vertically within the piston grooves they reside in. Ring flutter compromises the seal between

2350-545: The 1960s, due to advances in engine design and technology, two-stroke engines began to take root in the smaller classes. In 1969, the FIM—citing high development costs for non-works teams due to rules which allowed a multiplicity of cylinders (meaning smaller pistons, producing higher revs) and a multiplicity of gears (giving narrower power bands, affording higher states of tune)—brought in new rules restricting all classes to six gears and most to two cylinders (four cylinders in

2444-511: The 250cc class, in the 1966 season. Mick Doohan , who won 12 out of 15 (80%) of the 500cc races in the 1997 Grand Prix motorcycle racing season also deserves an honourable mention. Valentino Rossi is the most successful contemporary rider, having won nine titles including seven 500cc/MotoGP titles (2001–2005, 2008–2009), and one each at 250cc and 125cc levels. The current champion is Spanish rider Jorge Martín . The 2025 MotoGP World Championship consists of 22 circuits. The following shows

2538-428: The 3-cylinder, 765cc Triumph production engine, while Moto3 and MotoGP still use prototype engines. The starting grid consists of three columns and features around 20 riders. Grid positions are determined based on qualifying speeds, arranged in descending order, with the fastest rider occupying the pole . Each race is a 45-minute sprint, completed without any fuel or tire stops. In 2005, a flag-to-flag rule for MotoGP

2632-685: The FIM remaining as the sport sanctioning body. Teams are represented by the International Road Racing Teams Association (IRTA) and manufacturers by the Motorcycle Sport Manufacturers Association (MSMA). Rules and changes to regulations are decided between the four entities, with Dorna casting a tie-breaking vote. In cases of technical modifications, the MSMA can unilaterally enact or veto changes by unanimous vote among its members. These four entities compose

2726-467: The Grand Prix Commission. There have traditionally been several races at each event for various classes of motorcycles, based on engine size , and one class for sidecars . Classes for 50cc , 80cc, 125cc, 250cc, 350cc, 500cc, and 750cc solo machines have existed at some time, and 350cc and 500cc sidecars. Up through the 1950s and most of the 1960s, four-stroke engines dominated all classes. In

2820-540: The MotoGP grids. Presently four-cylinder engines appear to offer the best compromise between weight, power, and fuel consumption as all competitors in the 2009 series used this solution in either 'V' or in-line configuration. In 2002, the FIM became concerned about the advances in design and engineering that resulted in higher speeds around the race track ; regulation changes related to weight, amount of available fuel and engine capacity were introduced. The amended rules reduced engine capacity to 800cc from 990cc and restricted

2914-475: The PlayStation 3 and Xbox 360. Metacritic gave the game a rating of 72%. In 2013, Milestone got the exclusive license for MotoGP video games, a contract that will now last until at least 2026. The first game in this run of their contract was MotoGP 13 , which was released on 21 June 2013 on PlayStation Vita, PlayStation 3, and Xbox 360. The game received mixed reviews and scored 73%. As of September 2024

Honda NR - Misplaced Pages Continue

3008-521: The actual four-stroke and two-stroke cycles is not a simple task. However, the analysis can be simplified significantly if air standard assumptions are utilized. The resulting cycle, which closely resembles the actual operating conditions, is the Otto cycle. During normal operation of the engine, as the air/fuel mixture is being compressed, an electric spark is created to ignite the mixture. At low rpm this occurs close to TDC (Top Dead Centre). As engine rpm rises,

3102-426: The air has been compressed twice and then gains more potential volume in the combustion but it is only expanded in one stage. A turbocharger is a supercharger that is driven by the engine's exhaust gases, by means of a turbine . A turbocharger is incorporated into the exhaust system of a vehicle to make use of the expelled exhaust. It consists of a two piece, high-speed turbine assembly with one side that compresses

3196-477: The amount of available fuel for race distance from 26 litres (5.7 imp gal; 6.9 US gal) in year 2004 to 21 litres (4.6 imp gal; 5.5 US gal) in year 2007 and onwards. In addition, the minimum weight of four-cylinder bikes used by all participating teams was increased by 3 kg (6.6 lb). The highest speed for a MotoGP motorcycle in 125cc category is 249.76 km/h (155.19 mph) by Valentino Rossi in 1996 for Aprilia and

3290-499: The beginning of the new MotoGP era in 2002, 500cc two-stroke or 990cc four-stroke bikes were specified to race. The enormous power advantage of the twice as large displacement four-stroke engine over the half the size two-stroke meant that by the following season, no two-stroke bikes were racing. In 2007, the maximum engine capacity was reduced to 800cc without reducing the existing weight restriction. MotoGP-class motorcycles are not restricted to any specific engine configuration. However,

3384-538: The bike over to the "high side", usually catapulting the rider over the top. Increased use of traction control has made highsides much less frequent. 2023 saw the introduction of 'Sprint' race events; these races take place on the Saturday of the race weekend with the traditional Grand Prix taking place on the Sunday. The 'Sprint' races are shorter - approximately half the length of a Grand Prix. Riders score approximately half

3478-452: The bore diameter is larger than its stroke length is an oversquare engine, conversely, an engine with a bore diameter that is smaller than its stroke length is an undersquare engine. The valves are typically operated by a camshaft rotating at half the speed of the crankshaft . It has a series of cams along its length, each designed to open a valve during the appropriate part of an intake or exhaust stroke. A tappet between valve and cam

3572-417: The case of the 350cc and 500cc classes). This led to a mass walk-out of the sport by the previously highly successful Honda , Suzuki and Yamaha manufacturer teams, skewing the results tables for the next several years, with MV Agusta effectively the only works team left in the sport until Yamaha (1973) and Suzuki (1974) returned with new two-stroke designs. By this time, two-strokes completely eclipsed

3666-446: The control ECU hardware and software certain benefits to increase their competitiveness. From 2023, front ride height – or holeshot – devices were banned. These devices have been common place in MotoGP since the back-end of 2018, when Ducati first introduced a system that could lower the rear of its bike to help with acceleration off the line for race starts. Moto2 was initially a 600cc four-stroke class introduced in 2010 to replace

3760-436: The current standard of 25 mpg ‑US (9.4 L/100 km; 30.0 mpg ‑imp ). As automakers look to meet these standards by 2016, new ways of engineering the traditional internal combustion engine (ICE) have to be considered. Some potential solutions to increase fuel efficiency to meet new mandates include firing after the piston is farthest from the crankshaft, known as top dead centre , and applying

3854-474: The efficiency of the compression engine. Higher compression ratios also mean that the distance that the piston can push to produce power is greater (which is called the expansion ratio ). The octane rating of a given fuel is a measure of the fuel's resistance to self-ignition. A fuel with a higher numerical octane rating allows for a higher compression ratio, which extracts more energy from the fuel and more effectively converts that energy into useful work while at

Honda NR - Misplaced Pages Continue

3948-566: The efficiency of the engine could be increased by first compressing the fuel mixture prior to its ignition, Rudolf Diesel wanted to develop a more efficient type of engine that could run on much heavier fuel. The Lenoir , Otto Atmospheric, and Otto Compression engines (both 1861 and 1876) were designed to run on Illuminating Gas (coal gas) . With the same motivation as Otto, Diesel wanted to create an engine that would give small industrial companies their own power source to enable them to compete against larger companies, and like Otto, to get away from

4042-502: The energy generated by combustion is converted into useful rotational energy at the output shaft of the engine, while the remainder being lost due to waste heat, friction and engine accessories. There are a number of ways to recover some of the energy lost to waste heat. The use of a turbocharger in diesel engines is very effective by boosting incoming air pressure and in effect, provides the same increase in performance as having more displacement. The Mack Truck company, decades ago, developed

4136-412: The engine's performance and/or fuel efficiency could be improved by improving the overall efficiency of the cycle. It has been found that even if 6% of the entirely wasted heat is recovered it can increase the engine efficiency greatly. Many methods have been devised in order to extract waste heat out of an engine exhaust and use it further to extract some useful work, decreasing the exhaust pollutants at

4230-484: The entire race. Conserving rubber throughout a race is a specific skill winning riders acquire. Special 'Q' or qualifying tyres of extreme softness and grip were typically used during grid-qualifying sessions until their use was discontinued at the end of the 2008 season, but they lasted typically no longer than one or two laps, though they could deliver higher qualifying speeds. In wet conditions, special tires ('wets') with full treads are used, but they suffer extreme wear if

4324-407: The first internal combustion engine that compressed the fuel mixture prior to combustion for far higher efficiency than any engine created to this time. Daimler and Maybach left their employ at Otto and Cie and developed the first high-speed Otto engine in 1883. In 1885, they produced the first automobile to be equipped with an Otto engine. The Daimler Reitwagen used a hot-tube ignition system and

4418-531: The four-strokes in all classes. In 1979, Honda , on its return to GP racing, made an attempt to return the four-stroke to the top class with the NR500 , but this project failed, and, in 1983, even Honda was winning with a two-stroke 500. Previously, the championship featured a 50cc class from 1962 to 1983, later changed to an 80cc class from 1984 to 1989. The class was dropped for the 1990 season, after being dominated primarily by Spanish and Italian makes. It also featured

4512-422: The fuel known as Ligroin to become the world's first vehicle powered by an internal combustion engine. It used a four-stroke engine based on Otto's design. The following year, Karl Benz produced a four-stroke engined automobile that is regarded as the first car. In 1884, Otto's company, then known as Gasmotorenfabrik Deutz (GFD), developed electric ignition and the carburetor. In 1890, Daimler and Maybach formed

4606-529: The general public and unable to be ridden legally on public roads . This contrasts with the various production-based categories of racing, such as the Superbike World Championship and the Isle of Man TT Races that feature modified versions of road-going motorcycles available to the public. The top-division is known as MotoGP since 2002 , when the four-stroke era began. Prior to that, the largest class

4700-400: The heat of compression, is now called the diesel engine, whether a four-stroke or two-stroke design. The four-stroke diesel engine has been used in the majority of heavy-duty applications for many decades. It uses a heavy fuel containing more energy and requiring less refinement to produce. The most efficient Otto-cycle engines run near 30% thermal efficiency. The thermodynamic analysis of

4794-434: The intake air, and the other side that is powered by the exhaust gas outflow. When idling, and at low-to-moderate speeds, the turbine produces little power from the small exhaust volume, the turbocharger has little effect and the engine operates nearly in a naturally aspirated manner. When much more power output is required, the engine speed and throttle opening are increased until the exhaust gases are sufficient to 'spool up'

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4888-436: The intake, compression, power, and exhaust strokes of the four-stroke cycle to occur in a single turn of the crankshaft and was designed to avoid infringing certain patents covering Otto-cycle engines. Due to the unique crankshaft design of the Atkinson, its expansion ratio can differ from its compression ratio and, with a power stroke longer than its compression stroke, the engine can achieve greater thermal efficiency than

4982-459: The key technical regulations for each class. It was also introduced for the 2005 year, that under rule 2.10.5: 'No fuel on the motorcycle may be more than 15 °C below ambient temperature . The use of any device on the motorcycle to artificially decrease the temperature of the fuel below ambient temperature is forbidden. No motorcycle may include such a device.' This stops an artificial "boost" gained from increasing fuel density by cooling it. At

5076-496: The latest release is MotoGP 24 on PlayStation 5, PlayStation 4, Nintendo Switch, Microsoft Windows, Xbox Series X/S and Xbox One. Four-stroke engine A four-stroke (also four-cycle ) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction. The four separate strokes are termed: Four-stroke engines are

5170-458: The lifespan of engines, switching to a single tyre manufacturer, and banning qualifying tyres, active suspension, launch control and ceramic composite brakes. For the 2010 season, carbon brake discs were banned. For the 2012 season, the MotoGP engine capacity was increased again to 1,000cc. It also saw the introduction of Claiming Rule Teams (CRT), which were given more engines per season and larger fuel tanks than factory teams, but were subject to

5264-424: The mechanical parts of the engine. The rod-to-stroke ratio is the ratio of the length of the connecting rod to the length of the piston stroke. A longer rod reduces sidewise pressure of the piston on the cylinder wall and the stress forces, increasing engine life. It also increases the cost and engine height and weight. A "square engine" is an engine with a bore diameter equal to its stroke length. An engine where

5358-554: The mono tyre rule. At the end of the 2015 season, Bridgestone withdrew as tyre supplier of MotoGP. Following a formal tender, French tyre manufacturer Michelin became the official supplier for the 2016 season, marking their return to the series and testing began in Aragon immediately after the end of the 2015 season. Early Grand Prix video games include Grand Prix 500cc (1987), Cycles: International GP Racing (1989), Grand Prix 500 2 (1991) and GP-1 (1993). The first simulator

5452-470: The most common internal combustion engine design for motorized land transport, being used in automobiles , trucks , diesel trains , light aircraft and motorcycles . The major alternative design is the two-stroke cycle . Nikolaus August Otto was a traveling salesman for a grocery concern. In his travels, he encountered the internal combustion engine built in Paris by Belgian expatriate Jean Joseph Etienne Lenoir . In 1860, Lenoir successfully created

5546-495: The most expensive road motorcycles yet offered for sale, a limited number of the NR models (300 examples) were sold in 1992 with a 750 cc version of the engine, capable of developing approximately 130 PS (96 kW; 128 bhp) at 14,000 rpm in standard form. The Japanese market motorcycles were restricted by law to 77 PS (57 kW; 76 bhp) at 11,500 rpm. Although a heavy machine by modern standards, it incorporated

5640-441: The new PlayStation publisher and worked together with Italy-based Milestone to produce MotoGP '07 (PS2) and some of its successors. In 2008, THQ lost the MotoGP licence and Capcom became the exclusive publisher. MotoGP 2010 , an iOS game made in 2010 by I-Play, released on 3 September 2010 and was not received well by critics after having a 43% rating on Metacritic. MotoGP 10/11 was released by Capcom on 15 March 2011, for

5734-582: The new four-stroke engines, they were soon able to dominate their two-stroke rivals. As a result, by 2003 no two-stroke machines remained in the MotoGP field. The 125cc and 250cc classes still consisted exclusively of two-stroke machines. In 2007, the MotoGP class had its maximum engine displacement capacity reduced to 800cc for a minimum of five years. In 2009, during the Great Recession , in an effort to cut costs, MotoGP underwent changes including reducing Friday practice sessions and testing sessions, extending

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5828-462: The number of cylinders employed in the engine determines the motorcycle's permitted minimum weight; the weight of the extra cylinders acts as a form of handicap . This is necessary because, for a given capacity, an engine with more cylinders is capable of producing more power. If comparable bore to stroke ratios are employed, an engine with more cylinders will have a greater piston area and a shorter stroke. The increased piston area permits an increase in

5922-458: The number of engines that could be used in a season, and with larger fuel allowances during the races. Under the claiming rule, CRTs agree to allow up to four of their engines per season to be claimed, after a race, by one of the major manufacturer teams at a cost of €20,000 each including transmission, or €15,000 each for the engine alone. From the 2014 season, the CRT class was dropped in favour of an "Open Class" specification - allowing teams using

6016-544: The performance of his Michelin tires, switched to Bridgestones for 2008 and won the world championship in dominant fashion. Pedrosa controversially switched to Bridgestones during the 2008 season. In 2008, the rules were amended to allow more tires per race weekend—18 fronts and 22 rears for a total of 40 tires. The lower number of tires per weekend was considered a handicap to Michelin riders. The only MotoGP team using Dunlop tires in 2007, Yamaha Tech 3, did not use them in 2008 but switched to Michelin. For 2009, 2010 and 2011,

6110-415: The piston speed for industrial engines to about 10 m/s. The output power of an engine is dependent on the ability of intake (air–fuel mixture) and exhaust matter to move quickly through valve ports, typically located in the cylinder head . To increase an engine's output power, irregularities in the intake and exhaust paths, such as casting flaws, can be removed, and, with the aid of an air flow bench ,

6204-477: The points in these races. The Riders' World Championship is awarded to the most successful rider over a season, as determined by a points system based on Grand Prix results. Giacomo Agostini is the most successful champion in Grand Prix history, with 15 titles to his name (8 in the 500cc class and 7 in the 350cc class). The most dominant rider of all time was Mike Hailwood , winning 10 out of 12 (83%) races, in

6298-478: The poor efficiency and reliability of the Lenoir engine. He tried to create an engine that would compress the fuel mixture prior to ignition, but failed as that engine would run no more than a few minutes prior to its destruction. Many other engineers were trying to solve the problem, with no success. In 1864, Otto and Eugen Langen founded the first internal combustion engine production company, NA Otto and Cie (NA Otto and Company). Otto and Cie succeeded in creating

6392-409: The power of the four-cylinder machines. In 2002, rule changes were introduced to facilitate the phasing out of the 500cc two-strokes. The premier class was rebranded MotoGP, as manufacturers were to choose between running two-stroke engines up to 500cc or four-strokes up to 990cc or less. Manufacturers were also permitted to employ their choice of engine configuration . Despite the increased costs of

6486-421: The power output limits of an internal combustion engine relative to its displacement. Most commonly, the supercharger is always running, but there have been designs that allow it to be cut out or run at varying speeds (relative to engine speed). Mechanically driven supercharging has the disadvantage that some of the output power is used to drive the supercharger, while power is wasted in the high pressure exhaust, as

6580-497: The radii of valve port turns and valve seat configuration can be modified to reduce resistance. This process is called porting , and it can be done by hand or with a CNC machine. An internal combustion engine is on average capable of converting only 40-45% of supplied energy into mechanical work. A large part of the waste energy is in the form of heat that is released to the environment through coolant, fins etc. If somehow waste heat could be captured and turned to mechanical energy,

6674-449: The requirement to be tied to a municipal fuel supply. Like Otto, it took more than a decade to produce the high-compression engine that could self-ignite fuel sprayed into the cylinder. Diesel used an air spray combined with fuel in his first engine. During initial development, one of the engines burst, nearly killing Diesel. He persisted, and finally created a successful engine in 1893. The high-compression engine, which ignites its fuel by

6768-399: The ring and the cylinder wall, which causes a loss of cylinder pressure and power. If an engine spins too quickly, valve springs cannot act quickly enough to close the valves. This is commonly referred to as ' valve float ', and it can result in piston to valve contact, severely damaging the engine. At high speeds the lubrication of piston cylinder wall interface tends to break down. This limits

6862-415: The same class to provide similar performance. Consequently, all machines were two-strokes, since they produce power with every rotation of the crank, whereas four-stroke engines produce power only every second rotation. Some two- and three-cylinder two-stroke 500s were seen, but though they had a minimum-weight advantage under the rules, typically attained higher corner speed and could qualify well, they lacked

6956-406: The same time preventing engine damage from pre-ignition. High Octane fuel is also more expensive. Many modern four-stroke engines employ gasoline direct injection or GDI. In a gasoline direct-injected engine, the injector nozzle protrudes into the combustion chamber. The direct fuel injector injects gasoline under a very high pressure into the cylinder during the compression stroke, when the piston

7050-491: The same time. Use of the Rankine Cycle , turbocharging and thermoelectric generation can be very useful as a waste heat recovery system. One way to increase engine power is to force more air into the cylinder so that more power can be produced from each power stroke. This can be done using some type of air compression device known as a supercharger , which can be powered by the engine crankshaft. Supercharging increases

7144-452: The speed of the flame front does not change so the spark point is advanced earlier in the cycle to allow a greater proportion of the cycle for the charge to combust before the power stroke commences. This advantage is reflected in the various Otto engine designs; the atmospheric (non-compression) engine operates at 12% efficiency whereas the compressed-charge engine has an operating efficiency around 30%. A problem with compressed charge engines

7238-598: The start of the twentieth century and large national events were often given the title Grand Prix. The foundation of the Fédération Internationale de Motocyclisme as the international governing body for motorcycle sport in 1949 provided the opportunity to coordinate rules and regulations in order that selected events could count towards official World Championships. It is the oldest established motorsport world championship . Grand Prix motorcycles are purpose-built racing machines that are unavailable for purchase by

7332-536: The time to comment that NR meant "Never Ready") but Honda eventually succeeded in meeting the original performance criteria for the engine. The final 500 cc race version was capable of developing approximately 130 bhp at over 20,000 rpm. However, this rarely translated into success on the track for the NR500, and Honda subsequently redirected its Grand Prix campaign in the form of the NS500 two-stroke machine. In 1983/84,

7426-421: The top speed in the history of MotoGP is 366.1 km/h (227.5 mph), set by Brad Binder during the 'Sprint' race of 2023 Italian Grand Prix with a KTM RC16 . On 11 December 2009, the Grand Prix Commission announced that the MotoGP class would switch to the 1,000cc motor limit starting in the 2012 season. Maximum displacement was limited to 1,000cc, maximum cylinders were limited to four, and maximum bore

7520-414: The top-flight series, Agostini holds the title record with eight, followed by Valentino Rossi with seven and active rider Marc Márquez with six. As of 2023, Rossi holds the record for most top-flight race wins with 89. An FIM Road Racing World Championship Grand Prix was first organized by the Fédération Internationale de Motocyclisme in 1949. The commercial rights are now owned by Dorna Sports , with

7614-427: The total valve area, allowing more air and fuel to be drawn into the engine, and the shorter stroke permits higher revs at the same piston speed, allowing the engine to pump still more air and fuel with the potential to produce more power, but with more fuel consumption too. In 2004 motorcycles were entered with three-, four-and five-cylinder configurations. A six-cylinder engine was proposed by Blata, but it did not reach

7708-805: The track dries out. In 2007 new MotoGP regulations limited the number of tires any rider could use over the practice and qualifying period, and the race itself, to a maximum of 31 tyres (14 fronts and 17 rears) per rider. This introduced a problem of tire choice versus weather (among other factors) that challenges riders and teams to optimize their performance on race day. This factor was greeted with varying degrees of enthusiasm by participants. Bridgestone had dominated in 2007 and Michelin riders Valentino Rossi , Nicky Hayden , Dani Pedrosa , and Colin Edwards all acknowledged shortcomings in Michelin's race tires relative to Bridgestone. Rossi, disappointed with and critical of

7802-400: The track, a stationary yellow flag is shown. If a fallen rider cannot be evacuated safely from the track, the race is red-flagged. Motorcycle crashes are usually one of two types: lowside , when the bike loses either front or rear tire grip and slides out on the "low" side, and the more dangerous highside , when the tires do not completely slide out, but instead grip the track surface, flipping

7896-461: The traditional 250cc two-stroke class. Engines were supplied exclusively by Honda, tires by Dunlop and electronics are limited and supplied only by FIM-sanctioned producers. Carbon brake discs are banned, only steel brake discs are allowed. However, there are no chassis limitations. Until 2019, only 600cc four-stroke Moto2 machines were allowed. In 2019 Triumph replaced Honda as the sole supplier of Moto2 engines. The Triumph's engine configuration

7990-407: The turbocharger's turbine to start compressing much more air than normal into the intake manifold. Thus, additional power (and speed) is expelled through the function of this turbine. Turbocharging allows for more efficient engine operation because it is driven by exhaust pressure that would otherwise be (mostly) wasted, but there is a design limitation known as turbo lag . The increased engine power

8084-423: The use of a glow plug . The maximum amount of power generated by an engine is determined by the maximum amount of air ingested. The amount of power generated by a piston engine is related to its size (cylinder volume), whether it is a two-stroke engine or four-stroke design, volumetric efficiency , losses, air-to-fuel ratio, the calorific value of the fuel, oxygen content of the air and speed ( RPM ). The speed

8178-438: The valves not closing properly. This results in a loss of performance and possibly overheating of exhaust valves. Typically, the clearance must be readjusted each 20,000 miles (32,000 km) with a feeler gauge. Most modern production engines use hydraulic lifters to automatically compensate for valve train component wear. Dirty engine oil may cause lifter failure. Otto engines are about 30% efficient; in other words, 30% of

8272-460: The wet-weather bikes have steel brake rotors and different brake pads instead of the carbon discs and pads used on the 'dry' bikes. This is because the carbon brakes need to be very hot to function properly, and the water cools them too much. The suspension is also 'softened' up somewhat for the wet weather. When a rider crashes, track marshals up the track from the incident wave yellow flags, prohibiting overtaking in that area; one corner farther up

8366-409: Was GP 500 , launched in 1999. In the early 2000s, THQ published five video games for Windows and Xbox platforms, the first being MotoGP: Ultimate Racing Technology (2002) and the last MotoGP '07 (2007), whereas Namco of Japan published and in-house developed five video games for PlayStation platforms starting with MotoGP (2000) and ending with MotoGP (2006). In 2007, Capcom became

8460-489: Was 500cc , both of which form a historical continuum as the official World Championship, although all classes have official status. The championship is divided into four classes: the eponymous MotoGP, Moto2, Moto3 and MotoE. The first three classes use four-stroke engines , while the MotoE class uses electric motorcycles . The most successful rider in Grand Prix history is Giacomo Agostini with 15 titles and 122 race wins. In

8554-519: Was capped at 81 mm (3.2 inches). Carmelo Ezpeleta, the CEO of Dorna Sports , indicated that the projected changes were received by the teams favorably. From 2012, teams not entered by one of the major manufacturers could seek "claiming rule team" (CRT) status. Claiming rule team were intended to allow independent teams to be competitive at a lower cost and increase the number of entries in MotoGP. Claiming rule teams benefitted from less restrictive rules on

8648-553: Was contested over 6 rounds (at 4 Grand Prix weekends). The MotoE class gained World Championship status in 2023, and also switched to Ducati bikes. Tyre selection is critical, usually done by the individual rider based on bike 'feel' during practice, qualifying and the pre-race warm-up laps on the morning of the race, as well as the predicted weather. The typical compromise is between grip and longevity—softer compound tyres have more traction, but wear out more quickly; harder compound tyres have less traction, but are more likely to last

8742-410: Was double (2013 and 2014) CEV champion Fabio Quartararo . However, after a rash of incidents involving young rider fatalities in lower classes, the FIM set a minimum age of 18 starting in the 2023 season. The MotoE World Cup was introduced in 2019 and features all-electric motorcycles. The series uses a spec Energica Ego Corsa motorcycle, manufactured by Energica Motor Company . The first season

8836-415: Was introduced. Previously, if a race started dry and rain fell, officials could red-flag (stop) the race and either restart or resume on 'wet' tyres. Now, when rain falls, a white flag is shown, indicating that riders can pit to swap the motorcycle on which they started the race for an identical one, as long as the tyres are different (that is, intermediates or wets instead of slicks). Besides different tyres,

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