Engine Pressure

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Calculating the pressure inside the combustion chamber of a Briggs and Stratton 5hp engine at 3800 rpm involves understanding that pressure varies throughout the combustion cycle. The Mean Effective Pressure (MEP) can be calculated using the formula MEP = 1000 * (P * Nr) / (V * N), where P is power in kW, Nr is the number of crank revolutions per power stroke, V is the displaced volume per cylinder, and N is the number of cylinders. It's important to note that peak cylinder pressure will exceed the MEP and requires a more complex calculation. This foundational understanding aids in engine performance analysis. Accurate pressure calculations are essential for optimizing engine efficiency.
ditchpanther
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Hello,
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



Ditch
 
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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.
 
Thanks a lot this will really help with what we are doing

Ditch
 
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