Originally Posted by
keithtsr
I am running the stock header and pipe. I haven't made any changes to it. You are right about the altitude here. When I would go to sea level to fly in a pattern contest I always tried to get there a day or two early just to set up my engines. It was like having a super charger on them.
We should be able to improve performance yet by tuning the exhaust for smaller props. If you plan to turn an 11x7, 11x8, more RPM should be available. With the larger "long stroke" props (12x8, 12x9), the exhaust is actually a little restrictive and a longer pipe may be needed.
I'm running Wildcat 10% with 3 oz of castor oil added to it. I'm probably going to mix a few fuels together to get about 12 1/2 percent nitro. NovaRossi is pretty stun on running 10% fuel.
I'm reading that Wildcat Premium has 16% oil with a 20/80 castor/synthetic mix. That's pretty low castor content for the beast. No doubt it will perform well but it might be somewhat life limiting in the long run. It's likely a good thing that you added the 3 oz of castor. 5 oz might be even better.
Personally I'd really like to source 50/50 20% oil fuel (e.g., Sig Champion or Morgan 4-stroke) and dilute it with methanol. Find out where the sweet spot is ;-)
David