Power transmission question

2strok4fun

Member

Apr 6, 2002

1,085

1

• Jun 19, 2008

• #1

Here is one that I am sure is simple, but I cant find the answer.

If I have a pump that requires 12hp @ 1800 rpm and a motor that produces hp and runs at 3600 rpm with a 2:1 pulley ratio, what HP motor is needed?

do I still need the 12 hp? or will a 6 hp do with the reduction?

Thanx

 

M

mideastrider

~SPONSOR~

Jul 8, 2006

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• Jun 19, 2008

• #2

If the pump requires 12hp you'll need 12hp for the pump to make its rated output.

 

R

rmc_olderthandirt

~SPONSOR~

Apr 18, 2006

1,533

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• Jun 19, 2008

• #3

Yep, the engine needs to produce 12 Hp at 3600 RPM.

I would recommed a larger motor and throttle it down some.

Rod

 

MrLuckey

Fire Marshall Ed

LIFETIME SPONSOR

Feb 9, 2000

3,715

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• Jun 20, 2008

• #4

You gotta admit it would be really cool to do 12hp worth of work and only use 6 hp getting it done :)

 

2strok4fun

Member

Apr 6, 2002

1,085

1

• Jun 20, 2008

• Thread starter
• #5

MrLuckey said:

You gotta admit it would be really cool to do 12hp worth of work and only use 6 hp getting it done :)

Click to expand...

Yes, that is my initial thought, but then I started thinking that HP is only a calculation based on torque and if I am running the motor at its torque output at 3600 rpm, does the 2:1 pulley reduction double the torque at the 1800 rpm at the pump less parasitic loss?