Pond Boss Forums AERATION Systems questions Manifold heating up

JKB, I thought compressing a gas raised it's temp and decompressing a gas lowered it's temp? (something about the molecules being closer together and bouncing off one another more frequently?)

Yes, the other piece to the puzzle is the kenetic energy that is used to compress the gas.

For instance take a diesel engine. When the fuel is injected into the cylinder it doesn't ignite. But, compress that air 18 to 22 times, and the diesel fuel ignites - no spark needed like a gas engine. Again, kenetic energy needs to be added to the equasion to start in the form of a starter motor. IIRC, if a diesel isn't turning at least 220 rpm, then there isn't enough rapid compression to ignite the diesel fuel.