ORIGINAL: jamesflies
hey guys, a buddy of mine at the field today said that a pitts muffler robs power from the engine. if this is true, how so and is there any way to gain the power back? [>:]
Depends on the engine and size. A stock muffler with the baffle plate installed will rob about 200 - 300 rpm. A pitts usually only robs about 150 - 200 rpm.
Pitts are USUALLY noiser than a stock muffler.
The "robbing" of the power is attributed to the lack of back pressure, which in turn means less pressure to the fuel tank. 46 size engines USUALLY do not have a problem with this. Larger engines MAY have a problem (usually ). On my OS 160 FX I had to plug one of the tubes in order to get adequate back pressure to the tank.