Compressor Output

 

Today I extrapolated the compressor test data to get an idea of what compressor speed would be necessary.

Compressor Output 

The airflow is calculated by multiplying the cross-sectional area of the the tester by the speed the air is moving then converted from cubic metres per hour to cubic centimetres per minute.

Theoretical Engine Requirements

To calculate the theoretical air flow rate required for the engine to be 100% volumetric efficient, the displacement (swept volume) is multiplied by the engine speed and then divided by two because there is only one intake stroke for every two revolutions of the crankshaft.

Conclusion 

 

When the compressor airflow rate and the engine theoretical flow rate are compared the compressor is capable of lowing a great deal more than what is required by the engine. This means that the compressor must be under driven by using a much smaller drive pulley than the compressor pulley.

 

The next step is to calculate the conditions required for the engine to knock as well as when the engine runs at its greatest efficiency. Then the pulley ratios can be finalised.