> When I adjust mixture on the c310 engines, the only guage that moves > is the temp. Shouldn't the manifold pressure also be changing if the > engine is generating more or less power as the mixture changes? I do > see a yawing motion when I tweak mixture for a single engine so it is > affecting thrust output, I just can't see the effects on the guages > (other than engine temp.)
Changing the mixture does not affect the gaseous volume flowing into the cylinders, because the fuel is a small fraction, even after evaporation. If the engine RPM doesn't change, then the performance of the suction pump implied by the cylinders is unchanged so that there is no reason for the manifold pressure to change in any way whatsoever. On an aircraft with controllable prop, when it is in regulation, changing mixture affects neither the RPM nor the MP but the prop is invisibly changing the pitch to absorb variations in the power available from the engine. On a fixed prop, or when outside the regulation range for whatever reason, changes the engine power can only be dissipated by changes in RPM, which has a knock-on effect on the MP as described above. _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
