11/12mm oil pumps differeneces
24 August 2015, 08:58 AM
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Cool, thanks for that. I'm still on V3 heads and a fairly tame state of tune. I seen the group buy for genuine pumps and had thought about changing mine to 11/12mm if there was any benefit in doing so. As far as wear and tear goes, does the pump require replacement at some stage?
24 August 2015, 09:40 AM
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My personal experience has been with under piston squirters on my 3k mile old forged CDB I found the modded 10mm pump didn't develop enough pressure (3.8 bar@4k rpm and 90C), even cold starts only produced 5.4 bar max. So I have upgraded to an RCM 11mm pump (other makes of pump are available 
) which has given 1 bar more on each of those parameters. I know it's now more common to remove the squirters, but they're there so I have to cope with the extra demand.
) which has given 1 bar more on each of those parameters. I know it's now more common to remove the squirters, but they're there so I have to cope with the extra demand.
Last edited by Blue by You; 24 August 2015 at 09:41 AM.
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24 August 2015, 09:53 AM
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Not sure enough of my Subaru history facts to say, but I think they were fitted to all CDB engines, certainly not seen on all turbo engines. Someone is sure to be along with the right information.
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