Originally Posted by
1967brutus
The biggest part is the short period where the exhaust drwasw in air when the piston starts going down. That's the "poy" part... the "t" is the closing of the valve...
A bit a joke, but basically that basically is it.
It's coming down to phonetics is it? Hehehe
The piston has moved down the cylinder approx 30° of crank rotation (1/6 of it's downward travel) before the exhaust valve fully closes, long after TDC, so it seems likely that at that point most all of the air entering the cylinder would be through a wide open intake valve, very little through a nearly closed off exhaust valve. The point I'm making is that I don't see how there would be enough velocity remaining in the exhaust tract to make the "P" sound in poyt.
Hmmmmm