Recent content by A Atwood

Maybe I'm just a little dyslexic, I tried re-calculating and came up with the same result as you. 70°F with 10.0:1 compression -869°F. Not sure what I did wrong the first time. Thanks for the correction. ARN

For the temp calcs, I had to convert to kelvin, then back to F. All temp calcs must be based off of absolute. ARN

Thanks Dr. D. I am only interested in the pressure and temp just prior to ignition @ TDC(top dead center). Reason is, knowing these values, helps in determining if the pressure and temperature are significant enough to create detonating or pre-ignition. Octane of the fuel requirements as...

I appreciate the help. What I am calculating, is the psi and temp changes that go on inside of a running engine. I found a couple of formulas on your site by doing some searching. I believe they are the correct formuls that I need. P2 = P1 (V1/V2) ^y for pressure change, and T2 = T1...

The gas is a fixed amount. Trapped volume in the engine world. Does the constant have a known value. Would you mind walking me through to find the solution.

Homework Statement Trying to calculate changes in psi and temperature with a known change of volume. One cubic foot of air(14.7 psi) compressed to one tenth its original volume. 10:1 compression ratio. Starting temp=70° F or 294° K Homework Equations Don't know the equation. That is...