Differences in Oil Pump Gears?

[2_Liter_Turbo]

Went to go install the billet oil pump gears on my race car's engine. Found that they were a different size! Suck! Not sure what to do now, lol.

Application listed is the SR20DET, which is what I have. The outer ring diameter is 4mm smaller than OEM! Anyone else hear of 81mm vs 77mm SR20 gears? Thickness is different as well (Reimax is 10mm, factory is 9.4mm).

[2_Liter_Turbo]

Well, found that Reimax only makes gears for the S14/S15 oil pumps, not the S13 SR. When I bought these, they were listed for all RWD SRs... guess not.

[jedi03]

arent some of them interchangeable?

[RalliartRsX]

arent some of them interchangeable?

I think over the years and various configurations, there have been 5-8 different pump designs between FWD, RWD and 4WD SR20.

So the answer is; not necessarily (as the OP has figured out).

Example: SR20VE oil pump varies from a standard SRDET oil pump although they have the same external dimensions (if you look at them side to side internally, the differences are significant)