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Tomei Oil Pump For My Gtr

OMGGTR

By OMGGTR,
in Engines & Forced Induction

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KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

The new collar will be 40.7mm so you have probably just bought a collar for nothing. Don't waste any more money by getting it fitted. Yes it would entail machining off the old collar and replacing it with one exactly the same. Its only worth doing if you have the older style shorter collar that only partly engages with the pump.

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Great can anyone confirm this as i just lost 198 bux on a collar

No one's going to pay you $195 for a crank collar - your best bet is to see if your supplier will take it back less a handling fee maybe for a credit if not a refund so that you can buy something else off them.
OMGGTR Mentor

OMGGTR

Posted
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Posted

The factory crank collars tend to be far too small. Too much clearance between it and the pump gear.

Sounds like your engine is built so your stuck with the factory drive. At least its a long nose one though.

Balanced crank is good as is the ATI balancer.

More oil pressure is better to a point. AS A MINIMUM you want 10PSI per 1,000RPM. Oil pressure also depends a lot on what viscosity oil your using.

But lets say its a street car, you have your rev limiter set to 7,500 RPM, when the oil is hot, you would like around 90PSI at around 4,000RPM all the way through to 7,500RPM. Being an RB26 your rev limiter may be higher.

The more oil pressure you have the better (higher pressure around the bearings prolongs bearing life), but the more oil pressure you have the more problems you have trying to get the oil back down to the sump as quick as possible.

Why is this said if r33 crank is ok?

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Why is this said if r33 crank is ok?

Everyone agrees that the early short crank collars should be replaced to safeguard the oil pump but there is a theory that the later full length collars and therefore the Jun and Tomei collars (and the ones that I sell) allow too much clearance and therefore destroy oil pumps. I don't accept that this theory is by any means proven but those that believe it either weld up their cranks and machine them down to allow less clearance or else get bigger (than 40.7mm) collars made up. I don't know how they pan out.

There are hundreds or probably thousands of RB engines with stock full length collars that have not destroyed their oil pumps so I remain unconvinced.

In any case the collar you have bought will just replicate the collar you already have so that is why it is not worth fitting.

mico Proficient

mico

Posted
Posted

because there may be too much clearance and not enough meat on the std crank. the oil drive on the std crank is only cast and with a hard steel oil pump it may wear. installing a hard steel crank collar should lessen this and u should have a better clearance. just wait till u get the collar mate dont stress.

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