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Hi, I'm in the process of writing my own desktop Dyno software just for the sake of challenging myself and to learn as much about the math behind engines. I'm having a bit of a hard time though finding a way to calculate the approximate volumetric efficiency losses in the intake system. I know...

My apologies for the misunderstanding. When I stated in the OP that the intake airflow was a given, I was referring to max flow. What I need is how much air the engine will actually flow at a given rpm. @2000rpm the engine will flow far less than @5000rpm.

It's just a project that I wanted to work on. I'm not making it just because I need the software. I'm doing to better understand the math and physics involved with engines. I also just wanted to do it.

Greg Locock, as far as the intake airflow goes, what you have to start is max airflow at .50" lift. So at say 3000rpm, if you should be flowing 300cfm and your intake can flow 390cfm, you might only be flowing 270cfm because of the lower volumetric efficiency you would be at. I hope I explained...

Hi, I am currently working on software to estimate Power and torque output of an engine by user input information such as; Bore, Stroke, Cylinders, intake flow rate, head flow rate, Boost, valves per cylinder, cam duration and lift, Ignition timing and quite a few more. So far I have gotten to a...