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Old 07-08-2015, 06:25 PM   #1
InjectedSTi
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Default 07 vs 08 10mm Oil Pump (Not 11mm)

After doing some research and speaking to a couple reputable people here on the board, I've decided to go with the factory 10mm Oil Pump for my rebuild. However, I noticed that Subaru lists a different part number for the 08+ WRX 10mm Oil Pump. Does anyone know what the difference between the 02-07 WRX/STi 10mm Oil Pump and the 08+ WRX 10mm Oil Pump is? I was comparing some pictures of the two different pumps side by side and I do see a some added material to the bottom/middle section of the pump which leads me to believe that the 08+ 10mm pump was revised and might be a better replacement than the 02-07 10mm.

15010AA300: 02-07 WRX/STi 10mm
15010AA320 08+ WRX 10mm Single AVCS
15010AA360 08+ STi 11mm Dual AVCS

http://i.imgur.com/JtsVn1a.jpg
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Last edited by InjectedSTi; 07-08-2015 at 06:48 PM.
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Old 07-08-2015, 06:45 PM   #2
MrTris
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They're identical, for all intents and purposes. Just food for thought, there are currently THREE iterations of the same EJ257 SB, with three different PNs, two of which have the same heat-treated crank, with identical rods and pistons. There is no functional or physical difference, they just have different part numbers #becauseSubaru.
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Old 07-08-2015, 07:22 PM   #3
InjectedSTi
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Actually there were THREE different cranks used, Non-Treated, Nitrided, and Heat Treated. But let's not get into that whole debate comparing SB's. I'm simply comparing just the two 10mm Oil Pumps here. Clearly they're not "identical" as I can see changes to the housing. I'm just trying to determine what if any other changes there are that I don't see or know about. I know they're interchangeable I'm just trying to decide if ordering a 08+ 10mm will be more beneficial. Will it matter in the long run? Maybe not, but if the 08+ pump has been revised then obviously I'd rather have the better of the two.
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Old 07-09-2015, 07:33 AM   #4
KillerBMotorsport
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Sometimes changes like this are made due to process evolution. The casting house may have determined they'd get a better quality yield rate (due to inclusions, deforming, etc...) by tweaking the design some. This is very common in manufacturing, and you will see no discernible difference in function

We've made this same observation here. Clearance specs, rotor specs, port sizes, etc... are all the same. Order which ever one suits your fancy.
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Old 07-09-2015, 07:51 AM   #5
InjectedSTi
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The casting house may have determined they'd get a better quality yield rate (due to inclusions, deforming, etc...) by tweaking the design some.

This was my thoughts exactly!

I'd already planned on ordering the newer model buy just wanted someone to confirm whether or not there was anything specific that I should avoid using this model over the older one. We all know how manufacturers love to make changes that aren't always "upgrades"

Thanks for the input KillerB
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Old 05-18-2020, 12:27 AM   #6
kayaker43
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Ok, very old thread but it needs a correction.

Its widely assumed that all Subaru oil pumps have the same diameter rotors but with different thicknesses. There are actually two versions of the 10mm pump with either a 76mm diameter outer rotor or a 78mm diameter.

I have on my bench a 10mm pump from an STI engine that spun a bearing on the dyno. Its really still usable but I decided to at least replace the inner and outer rotors because they are much cheaper than a new pump. The old rotor is 76mm and the new rotor is 78mm diameter.

Also the external markings for the 10mm pump can either be "10" or "78" so maybe that's a way to tel them apart.
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