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Old 03-10-2011, 10:08 AM   #17
aschen
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Join Date: Dec 2002
Chapter/Region: TXIC
Location: Houston texas
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Quote:
Originally Posted by amanichen View Post
You're confusing the operation of a modern fuel injection system with energy required to pump air.

All engines are air pumps, regardless of how much fuel is added. Maintaining a smaller pressure differential across a pump requires less work and less energy. I don't know how else to put it

Again, the energy spent pumping air through the engine is a small fraction of the total energy used by an engine.
except gasoline engines are throttled by maintaining this differenctial pressure. at part throttle The engine is unaware if this is created by the filter or the throttle plate.
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