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Oil Restrictors

moogley

By moogley,
in Engines & Forced Induction

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Al Grand Master

Al

Posted
Posted

I have tried 1mm and 1.5mm, also using an N1 oil pump, both cases left me with a noisy head, on idle. Now i am ripping the restrictions out and running the std 2mm. Hopefully that would make it sound normal again.

Just my experience

PS: Any revs above 1000rpm, and the head sounded perfect/normal. Pulled down the head and found no wear on lifters or cams; after 10,000km.

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Dale FZ1 Veteran

Dale FZ1

Posted
Posted
I have tried 1mm and 1.5mm, also using an N1 oil pump, both cases left me with a noisy head, on idle. Now i am ripping the restrictions out and running the std 2mm. Hopefully that would make it sound normal again.

Just my experience

PS: Any revs above 1000rpm, and the head sounded perfect/normal. Pulled down the head and found no wear on lifters or cams; after 10,000km.

according to a build guide i have rb30s have 2x1.8mm restrictors as standard and rb25s have 2x1.5 standard but it recomends to use 2x1mm?

Moogley you've seen the man's advice. It's a fairly common experience - the issue is obtaining sufficient flow from the pump at low revs (idle) through a small orifice to fill the hydraulic lifters.

I have a stock pump with 2mm shim, and 2x 1.6mm feeds and no VCT. Hot or cold start it takes ~ 2-3 secs to pump up the lifters and otherwise the top end is silent at any engine speed. I expect it and can live with it

The other thing I found was a big impact by the grade of oil used on cold start oil pressure and lifter noise. The guide is just that, not a Bible. If you're 100% road use then stick with the stock feeds to avoid noisy lifters. But do drill out the internal oil returns in the block and head.

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