Cruising Sailors Forum Archive

your engine mfg should have that info readily available....

but, barring that you could take half the bore of your cylinders, square it, multiply by pi, multiply by the stroke, multiply by the number of cylinders, multiply by TWO (because it is a four-stroke engine), and that is the volume of air per revolution (you can get the units right, I assume). Multiply the volume per revolution by the number of revolutions per minute to get the volume per minute.

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