![]() ![]() To simplify the calculation, we developed this calculator. If you don’t know this value for your turbo, it is best to use 3.0. The volumetric efficiency is a factor determined by the efficiency of the turbo, the electronic control systems, the type of fuel injection and the variation of valve timing or opening.Ī carburated engine normally has a volumetric efficiency of 0.70 to 0.80, but the electronics can raise this figure as high as 2.0.Ī diesel engine (2 cycle or 4 cycle) normally has a volumetric efficiency of 0.90.Ī turbo can raise the volumetric efficiency to between 1.5 and 3.0. Then we multiply the results by the volumetric efficiency of the motor. If we want to calculate the CFM (Cubic Feet per Minute) for a 4 cycle motor we can multiply the cubic inch displacement of the engine by the maximum rpm (Revolutions Per Minute) and divide the result by 3456. When we don’t have the airflow numbers, we can use the general rule of 2.5 times the horsepower of the engine to get an approximate amount of air required. The engine manufacturer should specify the technical information required for this air consumption (CFM). Adapting any filter to an engine requires a consideration of the air flow required by the engine as well as the resistance of the filter and ducting. Each filter is designed for a certain air flow. One of the most important factors in air filtration is the determination of the right size filter for the engine.
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