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RB30 Oil pump Vs RB26DETT Oil pump

JNR24

By JNR24,
in General Automotive Discussion

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OVL-747 Enthusiast

OVL-747

Posted
Posted
Originally posted by SteveL

RB30ET also uses upgraded rod bolts.

theres no difference between rods and rod bolts.

when we rebuild these bottoms its common to put say arp bolts in but stock nissan is extremely good.

but most ppl just get em resized then the whole shootin match balanced - rb30s are tough as guts

SteveL Mentor

SteveL

Posted
Posted
Originally posted by OVL-747

theres no difference between rods and rod bolts.

We'll have to agree to disagree. I build these engines too, and the VLT r/bolts are definately an upgrade from the NA type. They even have a different PN...but apart from that, I can say the material is superior, having actually tested them in comparison. But as you say rods are identical.

ARP don't make rod bolts for any RB engine. The closest thing they have is VG30DETT bolts. Of course, it's possible to ream out the bolt holes to accept something for another engine (eg we use chev bolts in 2L U series Nissan engines).

Warpspeed Experienced

Warpspeed

Posted
Posted

It seems to be a standard belief that high power motors need big oil pumps. I have never understood this logic.

The larger capacity oil pumps are only needed to maintain oil pressure at idle. Think about it.

If you have an RB30E, you only need a certain sized pump to stop the oil light coming on at idle. Now if you have an RB30ET the turbo oil flow bleeds off a lot of oil from the engine, so they fit a larger displacement pump.

Same thing with the RB25DE, extra camshaft = more oil needed. RB25DET, bigger again, extra cam plus turbo.

RB26DETT, has two turbos, extra cam, plus oil squirters, so you need a really big oil pump, but only really at slow idle.

Now oil pump flow is proportional to engine RPM, so at say 2,500 RPM even a small oil pump is going to easily provide enough flow and pressure for any situation. The problem really only exists at idle RPM.

So the theory that you need a massive high volume oil pump for that 9,000 RPM racing engine is simply not true, quite the reverse in fact.

But if you are building a street RB30DETT, a big pump would be a very good idea, no matter what the final power rating.

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