Quote:
Originally Posted by peterrr
If the diesel was burnt before TCD your engine could ony run backwards
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Of course not.
As the engine is turning over the momentum of the crankshaft and flywheel will push the piston to the TDC, then move on to the expansion stroke of the
Otto cycle which does all the work.
The Diesel mixture will ignite as soon as the parameters for autoignition are met, which is either before TDC or never. That may happen at about 20 degrees before TDC, depending on a lot of variables.
Modern engines control the moment of combustion by injecting diesel into the cylinder at a precise moment in the cycle.
That will usually be advanced several degrees before TDC.
But don't take it from me, please read
Ignition timing - Wikipedia, the free encyclopedia
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