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Old 05-11-2008, 09:36 PM   #1
hypoxvi
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Default STi oil pump vs. WRX oil pump

Are they the same? what are advantages to using the STi oil pump in the 2.0L motor?
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Old 05-11-2008, 10:47 PM   #2
Turn in Concepts
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AFAIK there is no difference between the sti and wrx, but there are differences in model years and what was used. Search in the built motor forum as there is a thread about which pump provides more volume vs pressure.

Tony
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Old 05-11-2008, 10:54 PM   #3
MrSlowbaru
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08 sti has a larger oil pump
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Old 05-12-2008, 12:20 AM   #4
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The WRX and STI use the same oil pump (10mm FWIW) until 2008 when the STI got an 11mm pump. If you are still using your stock motor, I would say to just stick with the OEM pump. If you are going to build it up, or plan on making substantially more power than stock, then it might be worth upgrading your pump.

Of course, before that, you would want to make sure that you are using a good quality oil (lots of discussion on that)...

Good luck with your project.

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Old 05-12-2008, 12:41 AM   #5
hypoxvi
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would i benefit from using the 12mm jdm pump? my horsepower goals are under 300whp. I am more concerned about longevity as i am replacing the short block due to a spun bearing.
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Old 06-03-2009, 11:01 PM   #6
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Default 12mm oil pump beneficial?

Quote:
Originally Posted by hypoxvi View Post
would i benefit from using the 12mm jdm pump? my horsepower goals are under 300whp. I am more concerned about longevity as i am replacing the short block due to a spun bearing.
Old thread I know but it had the question I was about to ask but no one had responded to it. Would a 12mm oil pump on a 2.0 provide extra protection against a spun bearing?
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Old 06-03-2009, 11:55 PM   #7
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No, not necessarily. In fact, having too much oil pressure can be problematic as well. As others stated, there is a lot of discussion about this in the built motor forum. I would do a lot of research in there.

From what I've gathered (and this is very very summarized):
-10mm is fine in stock form for most 2.0L applications
-Shimmed 10mm for built 2.0L and hybrids w/increased bearing clearances and no AVCS
-11mm for built 2.5L w/single AVCS
-12mm for double AVCS and/or motors with piston squirters
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Old 06-04-2009, 12:48 AM   #8
FuJi K
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I will be running my 12mm pump. My engine setup consists of intake AVCS, oil squirters, and larger clearance rod bearing with the double cross drilled crank.

Until someone runs into an issue running a 12mm oil pump, I don't see a problem using it.
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Old 06-04-2009, 01:17 PM   #9
slowmike
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I'm running an shimmed 11mm pump on my hybrid with large bearing clearances
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Old 06-04-2009, 02:44 PM   #10
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Quote:
Originally Posted by wheatpaste View Post
...there is a lot of discussion about this in the built motor forum. I would do a lot of research in there.
I didn't check there. Thanks.
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