New oil pump size? help

Craig Fenlon

buying a new rcm oil pump,

opinions on 10mm v 11mm which is best?Oem is 10mm, is the 11mm overkill?

won’t be running massive power maybe 350 tops.


Site Supporter
Depends massively on exact spec, use, etc. But in very general terms "biggest isn't best".....
Age of engine and type of heads is also a factor.....


Type RA Member
I went with the 11mm RCM iirc
Car is a 98 Type R with a brand new block (S20C and Version 4 heads
I rarely pay full price for RCM parts as the garage I use has a similar relationship with RCM