Question

How to calculate max velocity for an engine?

Answer 1

In order to determine the maximum velocity of an automoble, you first need to determine the power loss due to drag and rolling forces, as pointed out above. For automobiles, the drag power is the largest, and varies as speed-cubed: Pdrag = (1/2) ρACdv3 See http://en.wikipedia.org/wiki/Drag_(physics [Broken]) while rolling resistance power is Prolling =~0.01 mgv where tire rolling resistance coefficient is ~ 0.01 Then match max engine power (torque x 2 pi RPM/60) to provide the necessary power. If, in an Excel run, the vehicle reaches maximum velocity before the engine reaches max power output, you will need a higher gear ratio. Understanding the power loss due to drag, rolling reststance, etc., and knowing the engine brake (dynamometer) power, and using the acceleration rate vs velocity Pacc = m a v (mass acceleration velocity) is sufficient to calculate elapsed times, final velocities, etc. 

Reference https://www.physicsforums.com/threads/how-to-calculate-max-velocity-of-a-vehicle-from-torque-and-rpm...

Answer 2

Answer:

Explanation:

In order to determine the maximum velocity of an automoble, you first need to determine the power loss due to drag and rolling forces, as pointed out above. For automobiles, the drag power is the largest, and varies as speed-cubed: Pdrag = (1/2) ρACdv3 while rolling resistance power is Prolling =~0.01 mgv where tire rolling resistance coefficient is ~ 0.01 Then match max engine power (torque x 2 pi RPM/60) to provide the necessary power. If, in an Excel run, the vehicle reaches maximum velocity before the engine reaches max power output, you will need a higher gear ratio. Understanding the power loss due to drag, rolling reststance, etc., and knowing the engine brake (dynamometer) power, and using the acceleration rate vs velocity Pacc = m a v (mass acceleration velocity) is sufficient to calculate elapsed times, final velocities, etc.