B Boy
Posts: 8
Joined: 4/1/2003
From: AL
Status: offline
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I just ran across this, and it has been an interesting read, but you guys forgot one important area of the motor through all of this. Ultimately, the only area that benefits from any charging, done anywhere, at any time, is the volume above the piston. Regardless of anything that happens prior to the compression of f/a mixture, the pressure above the piston will be created by the backpressures of the tuned pipe. As the piston approaches TDC (for the actual work of the motor to be done), the last port open before the combustion cycle is the exhaust port, period. Any pressurized air would have been effectively negated as it moved throught this area by the simple fact that air pressure (volume) normalizes immediately upon introduction to an open system. The arguement that a packet of compressed (or denser) air will sit around, remaining pressurized, and wait for all ports to close, is a subject of humor. The last complete volume of air before the explosion (in its entirety) is ; top of piston, exhaust opening, header, tuned pipe. Note, that none of the area effected by any type charging device is mentioned, because all ports have closed by this time, except for the exhaust. Therefore, this is where the final say in pressurization happens. Who cares about pressurization anywhere in the motor except above the piston just before the combustion stroke or before this area was sealed off from the crankcase. Unless you are able to pressurize this chamber with your super mixture just before this area closes, no significant performance gains can be yeilded. The only place that charging can be done is through the exhaust port.
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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Car Engines >> Car Nitro & Gas Engines >> RE: were to find a turbo or supercharger kit 
RE: were to find a turbo or supercharger kit - 
