Quote:
Originally Posted by oil pan 4
Diesels seem to want as much mass as possible stuffed in their cylinders to get the best fuel economy.
EGR delete, free flowing intake, ram air, water injection and turbo chargers all show FE gains on diesels.
One of the most important factors with FE is getting your diesel engine up to operating temperature.
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If you think about it, that all leads to conclusion that as piston compress stuff certain amount, if there is more stuff you gain higher CR and higher CR always improves things until it becomes too high.
That is at least image what I'm getting.
Real life results have always a lot of variables, cold starting, engine not staying at optimal temp, if short driving, drivetrain has more loss because oils and greases becoming thick and most of effect comes from cold, maybe using winter tires, winter diesel etc.
Also while air has more oxygen, it has less water, that might have something to do with something too, at least skin and throat becomes dry more easily
