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 | Illustrated: GDI Diagram |
GDI: Gasoline Direct Injection supplies fuel directly to the inside of the cylinder.
A variety of air-fuel mixtures can be created according to changes in the fuel injection timing.
| Direct fuel injection has been used in diesel engines for many years, but not in petrol engine until recently. Inherently, direct injection has two advantages :
1. Since the fuel is injected under high pressure directly into the combustion chamber, just before ignition by the spark plug, this allows the precise control of charge stratification vital to ignite ultra-lean air / fuel mixtures.
2. Direct injection also dispenses with the need for a throttle, so eliminating the pumping loss associated with drawing air around a conventional engine's butterfly valve.
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