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Calculation to find the torque required to start an engine

  1. Apr 24, 2015 #1
    I need to design starter motor based on the the torque required to rotate the flywheel and reciprocating mass in the engine.How to do the calculation .I have already done a part,i feel something more to consider
     

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  3. Apr 24, 2015 #2

    SteamKing

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    You've got a 5 liter, 4-cylinder engine with a 17:1 compression ratio, cranking at 200 RPM max.

    I didn't see any calculations which develop the amount of power it takes to turn this engine against the air being compressed in the cylinders. I don't think this power can be neglected.
     
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