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I've defined engine power requirements based on driving dynamics, but am not sure how to extend this to engine parameters. From design requirements, I've fixed my gear ratios, and hence can determine how much power and torque is required from the engine at a particular speed.

I want to then determine the architecture of the engine, in terms of bore, stroke, compression ratio, amount of fuel injected, as values that I can tune. Since its an SI engine, I'm taking air fuel ratio as stoichiometric, but I'm still unable to figure out how to determine the engine parameters as a function of the power required ?

Thanks in advance.

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# Automotive Calculating engine parameters from power requirement

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