Calculation to find the torque required to start an engine

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SUMMARY

The discussion focuses on calculating the torque required to start a 5-liter, 4-cylinder engine with a 17:1 compression ratio cranking at 200 RPM. Key considerations include the torque needed to rotate the flywheel and the reciprocating mass, as well as the power required to compress air in the cylinders. The participant emphasizes that neglecting the power needed to compress air could lead to inaccurate torque calculations for the starter motor design.

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  • Understanding of engine mechanics and dynamics
  • Knowledge of torque and power calculations
  • Familiarity with starter motor design principles
  • Basic concepts of compression ratios in internal combustion engines
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Engine designers, automotive engineers, and anyone involved in starter motor development or engine performance optimization.

akshai
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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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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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