First you need to know the volume of your combustion chamber, either by caculation [V(comb)=Pi*r^2*L] or by measurement (water displacement, etc). Then you need to know the stoichiometric concentration [C(stoic)] for your fuel. If you happen to be using propane in air, the value is 4.03% by volume (0.0403 cubic inch of propane per cubic inch of combustion chamber volume). Then you must decide at what gage pressure your fuel meter will operate [P(meter)]. Assume that atmospheric pressure is 14.7 psia (unless you can measure it otherwise). Then calculate the volume of the meter:
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