Tomei oil pump has resistance

[matty42o]

Hey guys

i have a rb Tomei oil pump I’ve purchased used. And is hard to turn… as in couldn’t turn the gears by hand. Installed spool billet  gears this arvo and doesn’t turn by hand aswell. Does turn when dummy fitted on the crank with no binding just has resistance. I’ve only delt with factory pumps. Is this normal?? Inspected pump housing and it looks basically like new. Thanks in advance!!

[Dose Pipe Sutututu]

This is my opinion (feel free to ignore), but since your motor is out I would just not stuff about and straight up install a Nitto oil pump and Nitto crank collar. 

I've used v1.0 of those said billet gears and they ate themselves up, albeit was installed in an old factory housing. There appeared to be a high amount of cavitation causing pitting on the gears - most likely from me sitting on the limiter like a tool.

Anyhow that motor died, 2nd motor went in and my current engine builder advised not to stuff about with swapping out gears and what not and just to get a Nitto pump straight off the bat.

[matty42o]

1 hour ago, Dose Pipe Sutututu said:

This is my opinion (feel free to ignore), but since your motor is out I would just not stuff about and straight up install a Nitto oil pump and Nitto crank collar. 

I've used v1.0 of those said billet gears and they ate themselves up, albeit was installed in an old factory housing. There appeared to be a high amount of cavitation causing pitting on the gears - most likely from me sitting on the limiter like a tool.

Anyhow that motor died, 2nd motor went in and my current engine builder advised not to stuff about with swapping out gears and what not and just to get a Nitto pump straight off the bat.

Thanks for the advice 

spool got back to me in regards for the clearance… turns out it’s only ment to have 0.02mm movement between inner gear and backing plate which is sounds pretty excessively tight for something doing 7000 rpm. So gonna pull it apart again to re check clearances 

[r32-25t]

Or you could listen to the advice of people who have done it before and fit a nitto pump that’s perfect from the get go rather then making 2 different products work together 

[Dose Pipe Sutututu]

A poor man pays twice, famous words and often repeated by @Piggaz

I've gone through both Spool v1.0 and v2.0 hears, have used both the original housing and then a brand new N1 housing. Both times saw pitting on the gears, however the 2nd pump I suspect was sucking up air too when the sump was drained around a few bends at the track thus costing a motor.

I was going to salvage the 2nd pump, but my current engine builder insisted on throwing it into the bin and going with a tried/tested/proven Nitto pump that delivers consistent pressure and will happily handle high RPM. 

FWIW my motor happily revs over 8500rpm.

[GTSBoy]

Hmmmmm.....take risks with the oil pump you should not.

/Yoda

[matty42o]

Yeah I might just bite the bullet and go nitto 

not exactly wanting to risk a fresh built 25/30. But thanks everyone for the heads up 

[BK]

Also Nitto pump = mandatory 8+ litre sump

[r32-25t]

I think all high flow pumps do 

[BK]

On 05/11/2022 at 11:00 AM, r32-25t said:

I think all high flow pumps do 

Yeah but a Nismo, Greddy or Tomei pump flow nothing close to the volume of a Nitto. A Tomei you'll get away with a Trust 6 - 6.5L sump - you won't with a Nitto,it may as well be a standard sump. It just isn't big enough and they baffles are crap.

I put at least 3 of my engine failures down to those Trust piece of shit extension things. Only the 8+ litre Hi octane or Lewis engines design seems acceptable for Nitto flow rates.