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Old 10-06-2015, 04:09 AM   #21 (permalink)
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Quote:
Originally Posted by oil pan 4 View Post
I used a 120v power drill, varrac, kill-a-watt meter and a hand held optical tachometer.
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You'd need to consider the efficiency of the electric drill. 200 watts drawn by the drill won't equate to 200 watts of effort.
That is, how much power does the drill consume when it's just spinning freely?
Apologies if you already took that into account!

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Old 10-06-2015, 11:51 AM   #22 (permalink)
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Originally Posted by oil pan 4 View Post
I am surprised how fast it warms up.
It must be stopped.
Isn't it better to have warm fluid that pumps easier than cold/thick fluid?

I just found a delete option for Ford 4cly engines on another forum. The 2008 Escape has the old engine with electric power steering so there is a bracket and idler pulley that can be used on any other car with the same engine. Idler is same dimension as PS pump so you don't even need a new belt. If I find one in a JY I'm going to give it a try but I'm not willing to spend $80+ to get a new one
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Old 10-06-2015, 01:04 PM   #23 (permalink)
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I can reuse the radiator mounted transmission heater to warm the fluid.
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Old 10-06-2015, 01:16 PM   #24 (permalink)
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Quote:
Originally Posted by markweatherill View Post
You'd need to consider the efficiency of the electric drill. 200 watts drawn by the drill won't equate to 200 watts of effort.
That is, how much power does the drill consume when it's just spinning freely?
Apologies if you already took that into account!
Of course I took that into account. I measured the drills unloaded power draw at both test speeds, before and after each test.
To free spin the drill up to 850rpm took more than 200 watts.
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Old 10-06-2015, 05:40 PM   #25 (permalink)
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Quote:
Originally Posted by California98Civic View Post
Or an electromagnetic clutch for the pulley like most alternators have now. The ECU could just disengage the pulley under certain conditions, as it does a "smart" alternator. "Smart" pulley driven power steering pump is born. Could put such a pulley on an "on/off" switch too and ckntrol it from the dash. So you would only draw power from the engine at the low RPMs that oilpan is saying draw very little power. But his test was without turning the steering wheel, so wouldn't turning the wheel increase power draw somehow?
I was looking into those alternator clutches and most appear to be one way clutches and dampeners.
That way when the auto transmission shifts and the engine RPMs suddenly drop you don't have the alternator trying to push the belt.
Apparently this can make some kind of noise or shimmy.

As best I can tell when you use power assist to turn the wheel with the vehicle sitting still the pumps power consumption goes up to at least 1hp even at low engine speed.
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Old 10-08-2015, 11:21 PM   #26 (permalink)
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Thank you for posting this information. I didn't realize that the power steering pump's parasitic drag increased that much with RPM.
This past May, I replaced the stock crankshaft pulley on my Mustang with a 25% underdrive pulley from ASP. Thanks to underdriving the power steering pump and the water pump, I've gained about a mile per gallon.
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Old 10-08-2015, 11:37 PM   #27 (permalink)
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You know there's a guy with a Ranger who put an a/c clutch on his power steering pump and detailed it all here on EM.
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Old 10-09-2015, 01:22 AM   #28 (permalink)
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I added the clutched power steering pump ranger to the wiki mod page years ago.

I found some more info on Saginaw pumps.
All belt driven power steering pumps do the same thing so this largely applies to them too.

According to hot rod magazine the early P1 Saginaw type pump moves up to 20GPM at 5,000RPM.
The saginaw type 2 makes 15GPM at that speed.

I would really like to just take my grossly over kill Saginaw pump and just clutch it.
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Old 10-09-2015, 12:59 PM   #29 (permalink)
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I would like to clutch mine but have concern about engage load burning it out. on a minibike site, there is a manual cone clutch. there were some that lost friction material due to loads but could be use on PS.
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Old 05-11-2016, 09:02 AM   #30 (permalink)
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I gave up on trying to put a clutch on the Saginaw P1 pump and just went with a 12v hydraulic power unit instead.
http://ecomodder.com/forum/showthrea...ion-32895.html

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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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