ORIGINAL: GaryHarris
ORIGINAL: proptop
Well...OK...piston port timed, but it's the top of the piston, not the skirt...
Beg to differ bro. The fuel/air mixture goes into the crankcase and then up through the transfer ports. If you shorten the rear skirt of the piston it allows earlier entry and more volume into the crankcase and up into the top end through the transfer ports. I admit though, I don't know anything that shnele thing. <sp></sp> I could be very wrong.
I know the types of engines you're talking about...certain motorcycle and snowmobile (etc. ) engines, but our model engines are different. The port timing is controlled by the location of the ports in the sleeve and the top of the piston as it uncovers/covers them, not the skirt. So they're not exactly what you'd call "piston ported" in the same sense as the motorcycle/snowmobile (weed whacker, leaf blower, etc. ) engines.