Calculating RPM from Torque & Inertia: Seeking Advice

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SUMMARY

To calculate the RPM of a combustion engine from torque and inertia, one must first determine the net torque by subtracting dyno torque from engine torque. This net torque is then divided by the inertia to find acceleration. The speed can be calculated by summing the acceleration over specified time intervals, such as 1 millisecond. However, it is important to note that during a dyno test, engine torque and dyno torque should ideally be equal, eliminating the need for calculation.

PREREQUISITES
  • Understanding of torque measurement in engines
  • Familiarity with inertia calculations
  • Knowledge of dynamometer (dyno) testing procedures
  • Basic principles of acceleration and speed calculations
NEXT STEPS
  • Research "Torque vs. Inertia in Engine Performance" for deeper insights
  • Study "Dynamometer Testing Techniques" to understand engine testing
  • Learn about "Calculating Acceleration from Torque" for practical applications
  • Explore "RPM Calculation Methods in Combustion Engines" for advanced techniques
USEFUL FOR

Engineers, automotive enthusiasts, and anyone involved in performance tuning or testing of combustion engines will benefit from this discussion.

r_james14
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As part of a much larger project I am doing for fun, is it possible to calculate the RPM of a combustino engine from the Torque and Interia.

Reason I am asking is i have a dyno torque result and an engine torque result and i am trying to calculate the speed. If anyone wants to know why or more information i'll happyily respond.

Thanks In Advance

James
 
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i have been generally told if i find net torque

Engine Torque - Dyno Torque and then divide the answer by inertia, i'll have acceleration.

Add these together for each time interval (1ms) ill have speed.

Have i been told correctly?

James
 
Is this an engine test on a dyno? The engine torque and dyno torque should be the same; since there's no loss across a flywheel.

Engine speed will be measured on a dyno test, you won't need to calculate this.
 

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