I am having a problem with some thermodynamics calculations. I am not very experienced with them and it certainly shows in my frustration with them! Anyway the check that I am using is incrementally simulated work compared to theoretical energy in. Example 31KJ in 133KJ mechanical work out. I am obviously way off considering other calculations predicted 42% thermal eff. if you ignore over unity. (diesel cycle) I am having trouble formulating intelligent questions that might help me understand what I am doing wrong but here it goes: let: p = pressure, y = 1.4,Cr = compressed volume ratio, Ps = initial pressure, Ta = temp added = 1000, Ti = initial temperature = 300K Vr = volume ratio Vr = Cr if Cr = 1, then T = Ti * Cr^(y-1) = 300K, T = T + Ta, Cr = (T/Ti)^(1/(y-1)) = 39.089 if the volume did not increase, p = 14.7 * cr^(1.4) = 2490 psi is this not correct? or am I missing something? now if Vr = .5 then Cr = Cr/Vr = 78 1714K = Ti * Cr^(y-1) and 6550 PSI = 14.7 * Cr^(1.4) How does this second part look? Thank you for your help, I appreciate it.