Extremely low timed motors such as the old sport motors and cheap airplane motors would run fine without a pipe, in fact they would sometimes go faster if the pipe got knocked off. Modern racing motors have much longer port durations and they rely on the tuned exhaust to run properly. Without it they will not run very well at all.
Sean. Certified speed crazed mowron.
Team Shepherd USA
Last edited by wingracer; 08-03-2008 at 05:58 AM.