The forum could really do with a sticky, so people can understand with clear simple instructions the black art of pipe tuning.

more info here.

http://www.rcaerobats.net/tuned_pipe_info.htm


If you tune for max rpm on the deck, then surly as the engine unloads in the air, the pipe will detune itself. have you got to set below peak rpm on the deck to allow for this.


One thing that isn't clear is what to do with main needle when tuning pipe? Is adjusment needed each time you cut the header? I assume you go richer the shorter the header.
Or do you leave it alone to measure the results.
If you shorten and dont tune hs needle then are you seeing the optimum rpm increase.?