Quote:
Originally Posted by Beaver
I understand that cold air is denser and contains more oxygen by volume than warm air, but the reason for depowering the motor I don't quite get. Maybe if you can explain what you mean by "pumping losses" I'll begin to get it.
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Small engines burn less gas. Its actually tricking the engine in to burning less gas by giving it less oxygen. Pumping losses are the work the engine has to do to force air past the throttle. That takes some HP.