![]() That is the very complicated thing to calculate.īut, as the piston goes down, friction will take some force away that will not be converted to torque. The curve's shape greatly depends on the intake-camshaft-exhaust design. It usually peaks out at a point near maximum torque, being lower before and after that point. The volumetric efficiency changes with the mean piston speed (which is directly related to rpm). The amount of air can be calculated based on engine size, rpm and volumetric efficiency. The last two are relatively constant throughout the rpm range. ![]() It depends mostly on the amount of air-fuel mixture that goes into the cylinder, the combustion efficiency and the efficiency of the thermodynamic cycle. IMEP is the average pressure within the cylinder. ![]() Is there a shortcut I can take to create a believable rpm/torque graphic just based on RPM, # cylinders and cylinder bore/stroke? ![]()
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