thanks all. in the spit and hurri i think i was simply flogging the engine. for cruise now i never have throttle more than three quarters.

anyone know what the max boost the spit can take for how long? as in - if i need to really flog the thing to get max performance to get out of trouble or whatever.

The Merlin III is cleared for +6 1/4 boost for 30 minutes, however you have to keep it blow 2600 RPM. Alway keep an eye on your oil temperature, it must not exeed 90°.

The only thing I have problems with is the prop pitch on the 109 and only when I'm fighting.

Ah the world of liquid cooled engines. That remember me, Boyington. When he had arrived to Birmania with the AVG , he made a familiarisation flight with a P-40. As usually he fly the machine near or like how he fly aircrafts of the USMC(radial engines, air cooled). In this flight in the pattern, he send the throttle to the gate and pafff!!, the MP-boost indicator go to the hell. The mechanic awaiting him at ground was all, minus happy.