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[QUOTE=RedDevil;355820] ...The Atkinson engine is therefore more efficient than a same sized normal engine on partial load. But where the Atkinson engine is at its peak, the Otto engine can produce more power. If you don't need that you could also use a smaller normal engine with the same peak power as the Atkinson engine, at roughly the same efficiency.
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OK thanks, that's what I'm shooting for. Derating Big Red for more efficiency.
Nemesis, those are some well detailed experiences. Some good meat to chew on.
So it sounds like you are thinking that increasing dynamic compression by advancing the intake cam will have a larger MPG benefit than reducing intake friction by retarding the cam to gain some atkinson effect. Correct?
Wow, lots of variables in the engine equation here. I think to get a good answer some engine modeling software is in order. Or more fun yet just run some experiments.
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Good design is simple. Getting there isn't.
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