Here is one method for determine Q_{in} from given information for an engine. For an automotive engine, the power per liter is given as 3.37x10^{4} W/liter, which is equivalent to 34 MW/m^{3} after a unit conversion. Doubling this value to include heat transfer results in approximately 60 MW/m^{3}. Next we need to determine the heat input in Joules for one cycle. Given that the engine speed, w, is 5000 rpm: If we are given the bore and the stroke to be: The displacement volume, V_{d}, can be found from:

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