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Old 04-11-2008, 03:50 AM   #1
bugeyes
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Default Converting power steering pump to crankcase vacuum pump?

I've been down the track of fitting an electric vacuum pump to generate crankcase vacuum (had it running at about 5" wg).
I didnt want much vacuum but did want it present all rpms and loads.

Electric pump didnt last very long, apart from the noise, large current draw it was never going to be a good long term solution. Pump burnt out as I later found out it wasn't rated for continuous use.

Now I'm thinking of convertng a subaru power steering pump. I'm thinking I may need to slow it down by changing pulley size and the slight oily mist that makes its way through the catch can may be enough to lubricate the vanes inside.

Anyone else tried this or thinking of it????
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Old 04-11-2008, 08:33 AM   #2
CTKAG
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I'd look at what's been done with other applications over the years. Various cars (at least here in the US) have had Hydroboost - a PS driven power assist. Diesels and factory turbocharged vehicles often had them.
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Old 04-11-2008, 03:20 PM   #3
Turbo_Mike
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Not so on WRX/STi, its vacuum boost.
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Old 04-11-2008, 09:00 PM   #4
nicad
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What about using an eductor/ejector in the exhaust stream to draw a vacuum?
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Old 04-11-2008, 09:17 PM   #5
shvrdavid
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Use an air injection pump....
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Old 04-12-2008, 01:27 AM   #6
8Complex

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What about using a vacuum pump rated for continuous, non-lubricated use?
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Old 04-12-2008, 03:39 AM   #7
bugeyes
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Quote:
Originally Posted by 8Complex View Post
What about using a vacuum pump rated for continuous, non-lubricated use?

This issue hasn't been missed.
AS far as I know till my pump arrives they are a standard vane type pump. If this is the case they will need very little lubrication and the vanes can be replaced by plastic types.
I am hoping the small amount of oil mist that makes its way through the catch can will be enough to lubricate it. I know that when I ran the electric pump there was a very small amount of oily mist that would make it through.
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Old 04-12-2008, 08:42 AM   #8
Nate8409
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Where did you put yours? Vacuum pumps are a great idea to move the crankcase pressure and free up some extra power.
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Old 04-12-2008, 11:38 PM   #9
charliew
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I thought about that and asked my son about this and his answer was the power str. pump is a low volume high pressure pump. A power steering pump is for pressure not volume you need volume to pull a vacuum on the motor. Look elsewhere.
As shvrdavid said a air injection pump might work.
Charliew

Last edited by charliew; 04-14-2008 at 07:36 PM.
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