Indirect injection in an internal combustion engine is fuel injection where fuel is not directly injected into the combustion chamber .
22-470: [REDACTED] Look up PFI in Wiktionary, the free dictionary. PFI may stand for: Pay for inclusion ( paid inclusion ), charge by a search engine to include a Web site in its index Pellet Fuels Institute , trade association of the wood pellet fuel industry Percy FitzPatrick Institute of African Ornithology Performance Freediving International ,
44-410: A 'dual injection' system, combining direct injectors with port (indirect) injectors, combining the benefits of both types of fuel injection. Direct injection allows the fuel to be precisely metered into the combustion chamber under high pressure which can lead to greater power and fuel efficiency. The issue with direct injection is that it typically leads to greater amounts of particulate matter and with
66-519: A freediving organization Popular Front of India , an Islamist organisation in India Port fuel injection ( indirect injection ), a type of fuel injection used in automobiles Practical Farmers of Iowa , an agriculture NGO in Iowa Pre-flight inspection , of an aircraft Private finance initiative , a way of funding public sector projects with private capital The Prize Fighter Inferno ,
88-583: A musical project of Coheed and Cambria frontman Claudio Sanchez Pro forma invoice, a billing document that is not a demand for payment but gives information about a shipment PFI Convention (Convention on the protection of the European Communities' financial interests), a multilateral EU treaty on fraud Perspektivnyi Frontovoy Istrebitel ("Perspective Frontline Fighter"), Soviet military aircraft; see Post-PFI Soviet/Russian aircraft projects PFIs, or Pharmaceutical Formulation Intermediates,
110-474: A pharmaceutical term Press Freedom Index Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title PFI . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=PFI&oldid=1190121727 " Category : Disambiguation pages Hidden categories: Short description
132-474: A pharmaceutical term Press Freedom Index Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title PFI . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=PFI&oldid=1190121727 " Category : Disambiguation pages Hidden categories: Short description
154-613: A way of funding public sector projects with private capital The Prize Fighter Inferno , a musical project of Coheed and Cambria frontman Claudio Sanchez Pro forma invoice, a billing document that is not a demand for payment but gives information about a shipment PFI Convention (Convention on the protection of the European Communities' financial interests), a multilateral EU treaty on fraud Perspektivnyi Frontovoy Istrebitel ("Perspective Frontline Fighter"), Soviet military aircraft; see Post-PFI Soviet/Russian aircraft projects PFIs, or Pharmaceutical Formulation Intermediates,
176-402: Is different from Wikidata All article disambiguation pages All disambiguation pages PFI [REDACTED] Look up PFI in Wiktionary, the free dictionary. PFI may stand for: Pay for inclusion ( paid inclusion ), charge by a search engine to include a Web site in its index Pellet Fuels Institute , trade association of
198-410: Is different from Wikidata All article disambiguation pages All disambiguation pages Indirect injection Gasoline engines equipped with indirect injection systems, wherein a fuel injector delivers the fuel at some point before the intake valve , have mostly fallen out of favor to direct injection . However, certain manufacturers such as Volkswagen, Toyota and Ford have developed
220-419: Is much more difficult than designing a prechamber. There is much more integration between the design of the injector and the engine. It is for this reason that car diesel engines were almost all indirect injection until the ready availability of powerful CFD simulation systems made the adoption of direct injection practical. Swirl chambers are spherical cavities located in the cylinder head and separated from
242-461: Is that deposits on intake valves from the crankcase ventilation system are washed by the fuel. Indirect injection engines also tend to produce lower amounts of particulate matter compared to direct injection engines as the fuel and air are more uniformly mixed. Indirect injection using pre-combustion chambers are also used in high performance engines, such as those in Formula 1 , where they can allow
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#1732844622294264-425: The cylinder, there is less heat loss involved in transferring the burning charge into the cylinder. Air cell injection can be considered as a compromise between indirect and direct injection, gaining some of the efficiency advantages of direct injection while retaining the simplicity and ease of development of indirect injection. Air cell chambers are commonly named Lanova air chambers. The Lanova combustion system
286-495: The engine cylinder by a tangential throat. About 50% of the air enters the swirl chamber during the compression stroke of the engine, producing a swirl. After combustion, the products return through the same throat to the main cylinder at much higher velocity, so more heat is lost to the walls of the passage. This type of chamber finds application in engines in which fuel control and engine stability are more important than fuel economy. These are also called Ricardo chambers, named after
308-414: The engine to produce more power with greater efficiency. The purpose of the divided combustion chamber is to speed the combustion process, and to increase power output by increasing engine speed. The addition of a prechamber increases heat loss to the cooling system and thereby lowers engine efficiency. The engine requires glow plugs for starting. In an indirect injection system the air moves fast, mixing
330-399: The fuel and air. This simplifies engine (piston crown, head, valves, injector, prechamber, etc.) design and allows the use of less tightly toleranced designs which are simpler to manufacture and more reliable. Direct injection , by contrast, uses slow-moving air and fast-moving fuel; both the design and manufacture of the injectors is more difficult. The optimisation of the in-cylinder air flow
352-437: The fuel no longer contacting the intake valves, carbon can accumulate on the intake valves over time. Adding indirect injection keeps fuel spraying on the intake valves, reducing or eliminating the carbon accumulation on intake valves and in low load conditions, indirect injection allows for better fuel-air mixing. This system is mainly used in higher cost models due to the added expense and complexity. Port injection refers to
374-400: The injector fires, the jet of fuel enters the air cell and ignites. This results in a jet of flame shooting back out of the air cell directly into the jet of fuel still issuing from the injector. The heat and turbulence give excellent fuel vaporisation and mixing properties. Also, since the majority of the combustion takes place outside the air cell in the cavity, which communicates directly with
396-428: The injector, said axis being parallel to the piston crown, with the injector firing across a small cavity which is open to the cylinder into the hole in the end of the air cell. The air cell is mounted so as to minimise thermal contact with the mass of the head. A pintle injector with a narrow spray pattern is used. At its top dead centre (TDC) the majority of the charge mass is contained in the cavity and air cell. When
418-424: The inventor, Sir Harry Ricardo . This chamber is located at the cylinder head and is connected to the engine cylinder by small holes. It occupies 40% of the total cylinder volume. During the compression stroke, air from the main cylinder enters the precombustion chamber. At this moment, fuel is injected into the precombustion chamber and combustion begins. Pressure increases and the fuel droplets are forced through
440-432: The small holes into the main cylinder, resulting in a very good mix of the fuel and air. The bulk of the combustion actually takes place in the main cylinder. This type of combustion chamber has multi-fuel capability because the temperature of the prechamber vaporizes the fuel before the main combustion event occurs. The air cell is a small cylindrical chamber with a hole in one end. It is mounted more or less coaxially with
462-512: The spraying of the fuel onto the back of the intake valve, which speeds its evaporation. An indirect injection diesel engine delivers fuel into a chamber off the combustion chamber, either a prechamber or swirl chamber, where combustion begins and then spreads into the main combustion chamber. The prechamber is carefully designed to ensure adequate mixing of the atomized fuel with the compression-heated air. An advantage of indirect injection gasoline engines versus direct injection gasoline engines
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#1732844622294484-444: The wood pellet fuel industry Percy FitzPatrick Institute of African Ornithology Performance Freediving International , a freediving organization Popular Front of India , an Islamist organisation in India Port fuel injection ( indirect injection ), a type of fuel injection used in automobiles Practical Farmers of Iowa , an agriculture NGO in Iowa Pre-flight inspection , of an aircraft Private finance initiative ,
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