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water pump queries

Mase

By Mase,
in Engines & Forced Induction

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Mase Mentor

Mase

Posted
Posted

I was told the vl (rb30) water pump fits the rb25's, but i was just wondering if anyone knew if they fit the rb20det as well??

Also, can anyone give me a quick run down on removal and install of a water pump.

This is how i see it,

*use white out to mark where cas sits on timing cover as i don't have a timing gun

*remove cas

*remove timing cover

*mark appropriate spots with white out so timing belt goes straight back in original position

*remove water pump after draining coolant system

*clean around the area with a rag etc and apply gasket with some gasket goo (any suggestions? )

*install new water pump

*put timing belt back on inline with white marks

*put all covers back on

Any suggestions/tips etc would be great.

cheers

Jayson

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Mase Mentor

Mase

Posted
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Posted

I reworded my search and got a few more results. So far i have removed mostly everything except for the harmonic balancer. I've cracked the centre nut but now need a harmonic puller to remove it. I paid $74.50 for a rb30 water pump (Protech) and had some gasket goo around so all up it should hopefully only cost me $74.50.

Joel the rb30 water pump seems identical to me. The only difference being that the top 10mm bolt hole is not slotted like the nissan one.

Cheers

Jayson

Sydneykid Grand Master

Sydneykid

Posted
Posted
There is a "powermax" one for like $80 from some parts places I've noticed (supercheap, etc).. Fit sheet says RB26DETT, RB25DET, RB30E, and RB25DE so if you ask me that sounds universal :P

They missed RB20DE and RB20DET and RB30ET. :slap:

  • 2 weeks later...
Sydneykid Grand Master

Sydneykid

Posted
Posted
So it is confirmed the rb20det motor will use an aussie delivered r31 skyline rb30 water pump....

Yes, definitely, absolutely, not a problem, all RB water pumps are interchangeable, go for it, let 'er rip, whack it on, bolts straight up etc etc.

You need to be aware that while they fit, there are slight differences in performance.

The RB20DE pump flows slightly less water at all RPM's (smallest engine, needs less cooling).

The RB26DETT pump flows slightly less water at high rpm (stops cavitation). :)

The RB26DETT N1 pump actually flows less than the standard pump for sustained high rpm use (racing). :idea:

The RB30E and RB30ET pumps are not designed for sustained high rpm (over 7,000 rpm), they are SOHC remember.

The RB20DET and RB25DET pumps are pretty similar in flow, but the impellers look different. :confused:

I think the RB25DE pump is prety much the same as the RB20DE pump but I haven't had them side by side to compare.

Hope that helps

Sydneykid Grand Master

Sydneykid

Posted
Posted
So what would be the right choice of water pump for a lower rpm 800hp Rb30/26

Standard RB26DETT would be my choice. There is one on my RB31DET, so I guess you could say I have put my money (or faith) where my mouth is. :)

  • 3 months later...
(B1) MR_fanny Grand Master

(B1) MR_fanny

Posted
Posted

sorry for digin the thread up again but im in the process of upgrading my water pump and have a few questions.

i wanted to upgrade to the N1 but syd kid says there is less flow than standard so does that mean for daily use and the occasional track/drift days its not worth it?

does the stock RB26dett water pump flow better than the stock RB25det??

Sydneykid Grand Master

Sydneykid

Posted
Posted
anyone??

Maybe I am the only one who has compared them, but the spec sheet confirms it. The N1 water pump is specifically designed for continuous high rpm use, so it doesn't cavitate. This means it pumps less water around at lower rpm. So if you use your RB26 a lot (only) on the track, an N1 water pump is maybe worthwhile. But driving around the street it will be a handicap, maybe on hot days with the aircon on, in traffic. The RB30 pump is much better for this as it was designed for lower (average) rpm.

That's all for me :birdie:

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