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Old 04-11-2013, 12:10 PM   #1
Sean2.5Black
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Member#: 150647
Join Date: Jun 2007
Chapter/Region: NWIC
Location: Beaverton, OR
Vehicle:
98 Impreza 2.5RS
Ej20G hybrid

Default Upgrade ej20g oil pump for vf39/43?

Hey guys a few years ago I put a vf39 on my 20g and ended up ruining the bearing in it... after talking with some subaru people and techs, it turns out this was supposedly a common problem in the 2 liters due to the smaller oil pump size... but what I've learned is only the 08+'s have a larger oil pump..


My question is;
When I end up doing my timing belt/seals, is it worth upgrading to an 08+ oil pump or should I just grab a 2liter pump?


Current setup;
Yellow tops
20g short block
2.5 heads
Vf39/43 soon
Not looking for more than 300hp
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Old 04-11-2013, 12:22 PM   #2
eg33GC
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Join Date: Mar 2009
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Vehicle:
99 V4
EJ20K RS

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bigger isnt better, and a 10mm is certainly adequate for what you have.
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Old 04-11-2013, 01:26 PM   #3
Sean2.5Black
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Chapter/Region: NWIC
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Ej20G hybrid

Default

Is the stock 20g a 10mm? I'll just grab an oem one if so lol.
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Old 04-11-2013, 01:33 PM   #4
eg33GC
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EJ20K RS

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indeed
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Old 04-11-2013, 01:53 PM   #5
luka
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Chapter/Region: E. Canada
Location: Waterloo
Vehicle:
1993 Impreza WRX JDM
Silver

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the newer STI's came with 11mm stock no? is that a bolt on for the 20g?
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Old 04-11-2013, 02:39 PM   #6
eg33GC
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EJ20K RS

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read the built motor forum on over-pumping stock engines
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Old 04-19-2013, 12:53 AM   #7
NewWRXMike
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This was something I was looking into as well because I was doing my timing belt. I decided to just reseal the oil pump and change out the O-ring.
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Old 04-19-2013, 01:28 AM   #8
Marnix
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1984 AM5, 1994 BC4,
2010 BR5

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Bigger pump than necessary will destroy your bearings - eventually. I always make sure that the pump size is matched in such a way that maximum oil pressure is available just before the turbo starts to really spool up and load the bearings. The bigger the turbo and the more revs you intend to make, the smaller the pump can be.

If the block has a lot of oil flow sapping features like AVCS, dual AVCS and/or oil squirters or larger bearing clearances you need to compensate for that with a pump one size bigger though.
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