Quote:
Originally Posted by Christ
Everyone forgot about the pumping loss reduction from WAI. Warmer air = thinner and easier to compress. It also reduces the effective compression of the engine because there's just less air being pumped in, meaning less force on the piston required to reach TDC on compression, so less bearing/ring friction, etc.
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I thought higher compression generally meant better efficiency? Or is it just that a higher compression, smaller displacement engine is more efficient than an equivalently powerful larger displacement engine with less compression?
Piston and bearing friction shouldn't be affected by compression, it's kinda like how there is the same rolling resistance from your tires if your going up a hill versus going on flat ground, at least that's how I see it. If it was effected, I suspect the difference would be very small.