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In direct injection, the fuel is injected at high pressure diretly into the combustion chamber.

This totally eliminates "intake emulsifying" and optimises the atomisation at precisely the right time, allowing the most efficient combustion, minimum particulate and lowest possible emmissions.

Generally, compression in diesel engines is between 18 and 22 bar, the injection in normally undertaken as the piston nears the top to optimise the point of ignition, requiring a high pressure fuel line and injector.

Btw....the image is of a direct injected petrol engine. Diesel engines work on high compression and "compressive ignition", whereas petrol engines require a spark....the spark-plug here instead of a glow plug (which is used in cold starting of a diesel engine) is key to identificaiton.

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