Quote:
Originally Posted by UsedTaHaveA68
The reason gasoline engines, including the 3.6DI, don't do this is because of the rate at which gasoline burns. Gasoline burns much quicker than heavier diesel fuel. If you were to inject it at TDC, where the air is extremely compressed and HOT, you would probably spontaneously ignite the gasoline. This results in an EXPLOSION, also called detonation.
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If detonation occurs at TDC wouldn't the force of the "EXPLOSION" force the piston DOWN? Where it was going anyway? Detonation occurs because the fuel burns as the piston is still travelling upward. When fuel burns as the piston moves downward, the energy is allowed a mechanical "place to go" and burns much more smoothly. Diesels are nothing more than controlled detonators. They burn smoothly. So does the DI. It's controlled by spark ignition however.
Your explanation still doesn't explain why the DI motors use high PRESSURE fuel injectors on the same levels as DIESEL engines. Speed is not the issue. Quite a bit of engine power is used to attain that level of fuel pressure. Why do that when you don't need to?