Originally Posted by
Hobbsy
Dan. the next time you break in a Saito by any method you choose, note that oil pours out of the vent at a high rate when the needles are rich, no matter the throttle setting or speed. The cylinder pressure will always be exactly what is required to drive the prop at the current rpm.
The cylinder pressure is much higher when the engine is accelerating the prop as it must overcome not only the air resistance, but the resistance of inertia of the mass of the propeller.
The WOT allows a denser intake air charge thus increasing cylinder pressure, thus increasing torque, thus accelerating the propeller speed/RPM. Once the propeller reaches the static RPM for the amount of throttle opened, then yes the cylinder pressure will be constant per the RPM/propeller size/pitch.
Does the cylinder pressure in your car increase if you accelerate @ WOT compared to accelerating like you have an egg under your right foot?