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Hey N-gineers!

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Ron from IL

11-26-2002 11:56:45




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Does anybody know the APPROXIMATE horsepower needed to turn a power steering pump? I know, I know--what car, etc., etc. I got a free pump from a friend off (I believe) a Nissan (PLEASE, no Nippondenso jokes!), and I'd like to use it to power a small hydraulic cylinder for a garden'sized dump trailer. Would 3-H.P. be enough?

TIA

Ron




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kevin

11-26-2002 16:43:08




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 Re: Hey N-gineers! in reply to Ron from IL, 11-26-2002 11:56:45  
Awright, lets look at it this way: 1 hp = 33000 ft-lb/min.

so maybe you want to lift 330 lb 3 ft. in 6 sec

330 lb x 3 ft = prox. 1000 ft-lb divided by .1 min

giving 10000 ft-lb/min which requires about 1/3 hp.

Now, let's say the overall system efficiency = 50%

so .33/.5 = .66 hp. minimum in this example.

Just scale these guesses up to meet YOUR requirements. Good luck and don't pinch yer fingers. I'm an electronics engineer NOT mechanical.

YMMV
kevin

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Jet9N

11-26-2002 15:49:32




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 Re: Hey N-gineers! in reply to Ron from IL, 11-26-2002 11:56:45  
I'm sure any small engine would serve your purpose
fine. I have a 10 HP lawn tractor that I built
some years ago. Later I built a loader on it and
run the loader with a power steering pump. Then
told the wife it didn't look balanced and built
a back hoe for it. This pretty well loads the 10
HP engine. Blew one pump out, just a little too
much for it.

I believe it's set for about 900 PSI.

HTH

Jet

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Dave Smith

11-27-2002 04:34:23




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 Re: Re: Hey N-gineers! in reply to Jet9N, 11-26-2002 15:49:32  
How about posting a photo of it.
Dave <*)))><



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Jet9N

11-28-2002 11:36:46




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 Re: Re: Re: Hey N-gineers! in reply to Dave Smith, 11-27-2002 04:34:23  
Don't have the capabilities. Sorry.

Jet



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Jim Spencer S.E. Michigan

11-26-2002 13:48:16




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 Re: Hey N-gineers! in reply to Ron from IL, 11-26-2002 11:56:45  
Ron:
There are a lot of considerations that must be made and just common sense will give you a better understanding.
For instance the area of a circle is 3.1416 times the (radius X radius). This means that if you had a 10inch diameter cylinder it will have 78 square inches in area. (5 X 5 X 3.1416). Ten (10) PSI would allow you to raise 780 lbs. You could do this with a 1/16 h.p. air compressor running off your battery but it would be slow.
I am not trying to be smart but get you to think. If you use a 3" dia. cylinder(1.5 X 1.5 X 3.1416)a little over 7 square inch area it will take 100 PSI to exert a 700 lb force.
I don't know what pressure a power steering pump will produce. It would be nice to know this unless you just want to experiment. I would think that probably 1 H.P would be enough for what you want to do. I do think that on an automobile it takes more than 1 H.P. during times when the car is stationary and turning the wheels, but during driving on the hyway it would use very little H.P.
I am a retired engineer, but I have been in Manufacturing all my life.
When Henry Ford made his first car I am sure many modifications were made before he developed the "TOWN CAR". The most important thing is to have fun and building the dump trailer sounds good to me.
Jim

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kevin

11-26-2002 12:21:05




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 Re: Hey N-gineers! in reply to Ron from IL, 11-26-2002 11:56:45  
Depends on how fast you want to do the work. The pump for my loader is 7 gpm at 2500 psi max (Vickers V20 vane pump) and this will take over 20 hp by way of comparison. I have done some calculations in the past, and determined that about 6 hp was the min pump hp I could tolerate before I got a deal on this one. Do not underestimate how much power it takes. Having said that, for something like a garden trailer lifting a couple hundred lb. not too fast, you are probably in the right ballpark with your 3 hp. If you want more specific numbers, we will need the pump efficiency, displacement, pressure, load and lifting speed.
fwiw
-kevin

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Willy-N

11-26-2002 12:16:55




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 Re: Hey N-gineers! in reply to Ron from IL, 11-26-2002 11:56:45  
I have a 5 1/2 hp engine that drive the pump for my 20 ton 4" cylinder Log Spliter it seems 3 hp would work your pump to do what you wanto do. Mark H.



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