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Engine Pressure

by ditchpanther
Tags: engine, pressure
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Apr28-08, 03:23 AM
P: 2
I was wondering if anyone could tell me or show me how to calculate the pressure inside the cumbustion chamber of a Briggs and Stratton 5hp engine. This calculation is done at 3800 rpm. Thanks

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Apr28-08, 03:28 PM
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P: 2,794
This is a complex question, and the pressure doesn't stay constant at any point during the combustion cycle.

Mean Effective Pressure is calculated by:

MEP = 1000 * (P * Nr) / (V * N)

Where MEP is in kPa, P is power in kW, Nr is the number of crank revolutions per power stroke, V the displaced volume per cylinder, and N the number of cylinders.

Note that the peak cylinder pressure will be much higher than this, but the calculation of this is far more involved.
Apr28-08, 07:59 PM
P: 2
Thanks a lot this will really help with what we are doing


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