manifold pressure and cylinder pressure?

[00 scrub]

Is manifold pressure on an airplane engine the same as cylinder pressure on an auto engine? If it is what is the manifold pressure of a GT-S engine at full throttle at about 7600rpm? I'm just curious to see if the two are the same measurments.

[autxr]

They probably are the same measurement, but the GTS's number will be roughly zero or even negative (relative to atmospheric pressure).

A turbo car on the other hand will have a number of about 8 to 14 psi (for "normal" cars).

My understanding is that planse (the propeller type) are all turbo props. that means some sort of positve pressure on the manifold.

Cylinder pressure is actually the pressure inside the combustion chamber and will be close to 220-240 psi in the Celica regardless of the RPM.

Scott

[Chui]

INtake manifold pressure and cylinder pressure aren't the same, as autxr stated. In a normally aspirated engine at wide open throttle you'll see a vacuum in the manifold. [ ~0.6 MPa]. If it were turbocharged the intake manifold operates at near maximum boost pressure under wide open throttle conditions.

Actually, the cylinder pressure is a function of engine load [recall the spark mapping changes as a function of engine speed, load and temperature]. Part throttle conditions will yield significantly less combustion chamber pressure.