Brewnog, I remember those formulas from my ICE class long ago. Is there an equation to calculate peak pressure if we make certain assumptions: full throttle/load, known boost, torque, cyl temp, valve timing. I made the assumption that peak cyl pressure occurs 15 deg ATDC. In my case, I have a solid model of an engine and I know the maximum hp and torque it will have to make. I want to do an FEA analysis on the model and I need peak cyl pressure(or a reasonable estimation) to go any further. I put together a small kinematic spreadsheet so I know piston position, velocity, acceleration, and rod angularity at any crank angle. Right now, I'm disregarding forces due to momentum. Any help would be appreciated.