ORIGINAL: brjensen71
OK, time for more details, I starting to wonder if the pipe I have is sized correctly. The goal is to get max RPM on high pitch prop.
The engine is a Super tigre 90, it has had boost port timing raised to match the inlet ports. The inlet and boost ports have smoothed. The crank timing changed to gain more RPM, and the piston modified uncover the ports.
I have been using a 15cc Macs pipe and header, and an APC 10X10 on 10% nitro fuel.
So far I have been able to get 15300 rpm from the motor.
I have included my data so far
what details?
you still do hold back the all important information that is needed to evaluate your problem, IF there is a problem. I do not like being led by the nose.