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Old 10-17-2008, 04:34 AM   #13
RickB
Scraping Paint
 
City: Fort Lauderdale
Vessel Model: CHB 48 Zodiac YL 4.2
Join Date: Oct 2007
Posts: 3,804
RE: Lehman Idle Speed

"... a gasoline engine needs the correct fuel-air mixture sent to the cylinders where the diesel "creates" the correct fuel-air mixture in the cylinder ..."

That's about it. A gas engine has to get it right with the entire charge from the beginning or it won't work well or at all.

In the combustion chamber of a diesel, mixture happens. That is why there is such intensive research going on in the science of combustion and the art of spray patterns. It is one of the reasons common rail has come back with phenomenally high rail pressures and electronic control of injection timing. With these systems we can modulate the timing and amount of fuel as well as deliver it in multiple injection events during the same power stroke and even intersperse fuel with water to control NOx.

This is the sort of thing that I believe will keep diesels around long after gas engines have gone by the wayside for many applications.
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