Originally Posted by
Captain Beaker
Closing the throttle reduces the manifold pressure, so that mass of air that is compressed and heated and then finally expanded is reduced. While the air acts a spring that heat loss is not recovered. Open throttle may be most efficient when the engine is running for real, the reverse applies without ignition. It is a exceptionally minor point in any case
????? So what does the MP read when you are on the ground with the engine stopped? Have you ever started a chainsaw or lawnmower? Hint, it's easier to pull the motor through with the throttle open. With all due respect, it's time to stop arguing. You're not making any sense.