GT-B oil pump

[adbramsay]

Hey guys
I need to know what kind of oil pump a 1997 Legacy GT-B comes with. I also need to know if it will take the added pressure of an external oil cooler? All help is appreciated, can not wait for the build to start in the new year!!!

[chuckthefuk]

I have never heard of added pressure from an oil cooler to cause oil pump flow issues.

I have fitted a few oil relocation kits and oil cooler on bone stock EJ25D's and a EJ205 Version 5 STi. Your safe for sure and I am pretty sure you bolt on any oil pump since even the EJ257 Oilpump is compatible with all EJ20 motors.

-Chuck

[adbramsay]

Thanks chuck. I just want to try protect the motor from big end failure again, any other solutions?

[chuckthefuk]

If your worried about oil starvation you can a few things:

1) Upgrade to a high-volume oil pump.. Cosworth makes a nice unit and its not to expensive.
2) Install a Oil Accumulator on the pressurizes side of your oil system -> http://www.moroso.com/catalog/categoryd ... tcode=1360 (http://www.moroso.com/catalog/categorydisplay.asp?catcode=1360)
3) Install upgraded baffled oil pan + windage tray/oil crank scrapper plate
4) Upgrade all your oil lines to stainless-steel to prevent sweating/expanding/cracks

Or just spend the $4000 and go Dry-Sump :-p

Cheers
- Chuck

[Robbks]

I just want to try protect the motor from big end failure again, any other solutions?
i doubt the cause of your big-end failure in a GTB was oil starvation.
more likely detonation from poor fuel, hot intake air, or too much boost.

GTB's were prone to big-end failure. especially, used imported models from japan. which are generally not serviced as often as they should be

[2000gtb]

JDM STi oil pumps from what I research is "bigger" than USDM.. 12mm to the US 9mm.. once you do this you can get the cosworth oil pan with baffles and a new oil pick-up... adds a quart of extra oil... you should be set..

[Huffer]

I just want to try protect the motor from big end failure again, any other solutions?
i doubt the cause of your big-end failure in a GTB was oil starvation.
more likely detonation from poor fuel, hot intake air, or too much boost.

GTB's were prone to big-end failure. especially, used imported models from japan. which are generally not serviced as often as they should be

I second this. When I was in NZ, every other week a GT-B or GTB was in the shop for engine repair. Too much boost for weak internals was the culprit, not a lack of oil flow.

If you want to prevent failure, wind the boost down, or convert to a single turbo engine without the internal issues.

[adbramsay]

hey guys,
I thank you all for your info, at the moment I am ordering a reconditioned (rebuilt) ej20g closed deck block. The block will come with a few goodies including arp head studs, acl bearings, ej20g crank, and wrx pistons (cast). I am running stock boost so I do not feel the need for forged internals internals. However, I am going to be running about 8.3:1 compression instead of the stock 8.0:1, this was as close as we could get using stock parts (otherwise serious costs were involved). I was more worried about oil flow issues. Here in the Bahamas we have notoriously poor gas, anywhere from 87-89 mon octane which is the equivilant of 92-93 ron which is what the lower end of the legacy spectrum is capable of handling. I am also going to install an external oil cooler, instead of the tiny, but still effective stock subaru item. I have spoken to several people including my mechanic and he says the stock pump is ok.