In order to calculate the required flow rate (CFM), we need to know the engine displacement. Unfortunately many calculations / online calculators require the (CID) of your engine or your Cubic Inch Displacement to work. Use the following formula to work it out. We use litres and CC here in South Africa and United Kingdom so here goes! I.e. 1780 CC = 1.78 Liters.
CFM = CID x RPM x VE / 3456
CID = Cubic Inch Displacement RPM = Revs per minute VE = Volumetric Efficiency (Most 4 cylinder DOHC engines are 85%) Modified engines can go to 95+ % efficiency.
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