RE: Tuned Pipe throttle question
Konrad,
The maximum recommended nitro for the OS.46AX is only 20%.
I am quite sure this is for the engine with the 'standard', P-Box muffler.
Even simply mounting a large prop on any engine, will lower its tolerance to nitro.
A tuned-pipe will do this for sure.
Any change in the engine's setup, that causes it to be be more 'volumetrically efficient' (as in cramming more fresh mixture into the combustion chamber); will cause it to act 'like a dog'; as if too much nitro is used. Shimming the head up is one of the easiest modification to perform; only a bit more difficult than changing a glow-plug.