Water Pump

[dmonic1]

hi guys i am about to do the 100,000 km service on my stagea and was wondering if all the RB motors use the same water pump. im pretty sure the RB26 is the only motor that is different.

i am sourcing all my parts through my uncles workshop but some of his part books are a bit old.

any help would be greatly appreciated.

[chook]

you will need a NEO (R34 Gtt) water pump, different(and dearer) to standard rb25 rb26, part #21010-AA527.

eg http://www.kudosmotorsports.com/catalog/ni...25det-p-38.html

http://www.skylinesaustralia.com/forums/in...t&p=4533449

[dmonic1]

is there anything in particular that makes the NEO engine water pump different to the others.

i imported my car from synergy a few years ago and while i was in there last week they said they use standard RB25 R33 water pumps as the only difference was a 10mm locator bolt hole was missing.

just trying to save some money if possible as RB30/25 water pump i can get for about $80.00

[chook]

from what ive read, Nissan addressed some water flow issues with earlier pumps with higher flow at mid range rpm on the NEO pumps through their redesign. I suppose its like oil, whatever the budget can allow, but NISSAN wouldn't have redesigned it without a reason.

[dmonic1]

does everybody change it at 100,000 or is a if it's not broke don't fix it rule apply

[jrm]

Given the work required to change it - you'd be silly not to do it at the 100,000km service time.

[RubyRS4]

Given the work required to change it - you'd be silly not to do it at the 100,000km service time.

+1

Your belts are off and you've drained the coolant anyway to remove the radiator ... its just so easy to do the waterpump too at the same time.

I am doubtful tho about the Neo waterpump being different. Is there a link to some info confirming this?

[kidafa]

NEO pump is different, its been covered a million and some more times

[RubyRS4]

NEO pump is different, its been covered a million and some more times

How is it different? Where is the source? I'm trying to find specs but they don't exist. Just spoke to Nissan and even they don't know how they are different.

What I have found is:

Part #21010-70TY5 ($110) - for R32 GTST

Part #21010-58S25 ($120) - for R32 GTR

Part #21010-21U26 ($175) - for R33 GTST/GTR, R34 GTR, and series 1 Stagea

Part #21010-AA527 ($260) - for R34 GTT, series 2 Stagea

Part #21010-24U27 ($380) - for N1 Skyline GTR

Note: they say "for" not "fit", so you could interchange.

[RubyRS4]

More info sourced from guys who've done the comparison overseas with pics ...

One source claims the standard RB25DET pump appears shallow, whereas the Neo water pump is deeper, but there is no comment on the blade design/difference. No pics were available to back it up.

Below is an N1 water pump vs OEM RB25DET pump. Blades are obviously different:

The N1 flows less than OEM for a balanced high RPM setup.

The OEM flows more than N1 and is good for street and light track time.

Above is the N1 compared to an EOM Neo pump.

One source says the NEO pump looks like Nissan addressed the flow issue they were having at mid-high RPM (again, no pics/evidence to support this).

Below is a pic of an RB25/RB26 pump (non N1/non Neo)

So ... best way to solve the argument is to get our hands on the 3 types of pumps (OEM RB25, OEM RB25 Neo, N1) and measure volume/capacity/depth, and blade specs and take pics.

So who's got some spare waterpumps lying around?

[KiwiRS4T]

The only difference I know about is in the positioning of one of the mounting bolts. Some aftermarket pumps cater for this by having a slot there so it will fit all applications. Pumps are supposed to be good for 200.000 so if you are confident about the speedo reading and pump is OK you could leave it til the next belt but if you think speedo may be wound back then change the pump anyway.

[leetom]

rb30 pump fits s1 and 260 just need to block 1 hole in block with grub screw, apparently has more capacity and costs about $80(neo & s1 block are the same?)

[Brandon]

If I'm not wrong, the N1 will fit most variants due to that oval shaped hole. As mentioned above, its the mounting bolts thats different. I'm not 100% sure though. Lesser blades on the N1 was for more flow? isnt it? If they're all spining at the same RPM, the one with lesser blades should flow more.

[lachlanw]

less blades beats the water up less at high rpm

there is a thread with pictures of all 4 in and its really not that hard to find . do a search . it you cant find it you fail at internet