I have a WRX and EJ22t oil pump sitting in my garage. So, I did alittle research and measuring to figure out which should be used in the new engine. All "case" dimensions are within .001in of eachother, and the gear width (measured .393in/9.9822mm)/profile are the same. I've always been under the impression that the 22t pumped a larger volume. Although, after comparing both, I can only conclude that they are the same pump. Ej22t pump on left, WRX on right. Ej22t gears on left, WRX on right. Am I missing anything here?....:eek3: Feel free to post up any other findings, I am particularly interested in comparing these 10mm pumps to the 12mm.
I see the "10" on the 22T pump. I'm just surprised at the 10mm rotor of the WRX pump. The casting of hte WRX pump does not have the typical size designation on the inside, which is visible on the 22T pump. I want to see the bypass valve apart on both.
The one on the right is the WRX pump with the 10 on it. I don't see any markings on the 22t pump tho.
Thats a shot of the inside, underneath the rotating gears of the pump. ej22t on left, wrx on right. Can it be taken apart any further?
Yes as Dan said you can remove the bypass valve. Its the hex on the right-side of the pump looking from the front. Also all the pumps ive seen have the size marked on the front top to the left of the CPS boss. 22T markings seen here: http://s31.photobucket.com/albums/c389/Threshld1/93%20Legacy%20SS/Oil%20Pump/?action=view¤t=P8170191.jpg
Now this is very interesting: I removed the bypass valve on both pumps, the 22t pump had 1 shim and the wrx pump had 2. Is it safe to run 3 shims?
22t left, wrx right I was not expecting to see the shims in the wrx pump, was it manufactured shimmed/nonshimmed in different years? From what I have read, the spring rates are the same between the two pumps, is this true?
orly.... WRX has 2 shims.... must be the same for JDM. Meaning that would be for factory 8000rpm like JDM.
