Torque to speed reduction ratio

Thread starter bcarver
Start date Jan 27, 2009
Tags

Ratio Reduction Speed Torque

AI Thread Summary

Reducing the speed of a 200hp motor from 1750 rpm to 190 rpm using a 9.2:1 pulley ratio theoretically increases the torque to 5520 ft-lbs. However, this calculation does not account for losses due to friction in the pulley system, which can significantly affect the actual output torque. Users should consider these losses when determining the effective torque at lower speeds. Overall, while the multiplication of torque by the ratio seems straightforward, real-world applications will yield lower values. Accurate assessments require factoring in efficiency losses to ensure reliable performance.

Jan 27, 2009

bcarver

hi,I was wondering if anybody would know the following:

If I have a 200hp motor that has 600ft/lbs of torque at 1750 rpm
and reduce the speed to 190 rpm with pulleys 9.2:1 does that
give me 600ft/lbs x 9.2 = 5520 ft/lbs torque @ 190 rpms?

thanks

Engineering news on Phys.org

Jan 27, 2009

brewnog

Science Advisor

Gold Member

Yes, minus losses due to friction in the pulley system.

Thread 'Query on Isentropic relationships (such as PV^gamma = constant)'

Hi all, I have a question. So from the derivation of the Isentropic process relationship PV^gamma = constant, there is a step dW = PdV, which can only be said for quasi-equilibrium (or reversible) processes. As such I believe PV^gamma = constant (and the family of equations) should not be applicable to just adiabatic processes? Ie, it should be applicable only for adiabatic + reversible = isentropic processes? However, I've seen couple of online notes/books, and...

View full post »

Thread 'Dry sump pump issue'

I have an engine that uses a dry sump oiling system. The oil collection pan has three AN fittings to use for scavenging. Two of the fittings are approximately on the same level, the third is about 1/2 to 3/4 inch higher than the other two. The system ran for years with no problem using a three stage pump (one pressure and two scavenge stages). The two scavenge stages were connected at times to any two of the three AN fittings on the tank. Recently I tried an upgrade to a four stage pump...

View full post »