When I get a chance I will try some different props and fuels on the Mighty Tiger and establish a much broader spectrum of performance from the stock setup. Been kinda busy lately.

If you intend to keep running FAI fuel you could gain quite a bit of power simply from increasing compression ratio.

Yep I know, that is why i mentioned it was still there. This is the way 99% of all new modelers are going to run this engine IF they have no nitro or just buy the cheapest stuff in the store. As I said I will do some additional testing, I just found an APC 11X6 to bolt on and retest and I will check my supply of fuel and determine what fuel I have the most of for the higher nitro test.