Neo Oil Pump Question

[Guishnu]

Hi All,

I have searched the forum to try and find the answer but have had no joy.

Do you know if the RB25DET Neo oil pump is different from the S1/S2 RB25DET as used in the R33 GTST? I was wondering if it was in any way superior to the ones used on R32/R33 RB25 & RB26 engines.

Cheers

Chris

[bigjiz]

im pretty sure that the 25 bottom end r all the same its just the head that is different and for the 32 (rb20) i think it is slightly better geared but dont quote me on it

[GTSBoy]

im pretty sure that the 25 bottom end r all the same its just the head that is different and for the 32 (rb20) i think it is slightly better geared but dont quote me on it

Um. No. Neo bottom end is quite different. Block is basically the same thing. 25Neo uses the same rods as RB26. Pistons are different to plain old 25s. And I am told that the 25Neo uses an N1 oil pump too.

[Guishnu]

Well you see,

I had heard that the neo 25 had an N1 oil pump - but wanted to know if it's just another internet myth or if there is any proof?

EDIT:

It seems that:

- RB25DET S1/S2 motor uses oil pump part number 15010-5L800

- N1 Oil pump is part number 15010-24U00 that was superseeded by 15010-24U01

Might help anybody else searching in future....

- N1 Water Pump- 21010-21U26

N1 Water Pump Part Number

Edited March 13, 2012 by Guishnu

[GTSBoy]

Yes, I figured you were obliquely fishing along that line of enquiry. That's why I said "I'm told". Because I haven't seen it myself.

Someone on here confidently posted an assurance that they use the N1 pump only a few months ago (like within the last year).

cheers

[Guishnu]

:-)

Trying to find the part number for the RB25DET Neo oil pump is like trying to get blood from a stone. Hopefully somebody on here will have access to the Nissan parts database and can look it up.

[Guishnu]

For some reason it won't let me edit my above post anymore - so...

It seems that:

- RB25DET S1/S2 motor uses oil pump part number 15010-5L800

- R34GTR RB26DETT uses oil pump part number 1501005U11 that was superseeded by 1501005U12

- N1 Oil pump is part number 15010-24U00 that was superseeded by 15010-24U01

Webbers Oil Pump Comparison Guide

http://webbersrbguide.com/index.php?option=com_content&view=article&id=60:oilpumps&catid=46:engine-mechanical&Itemid=22

Edited March 13, 2012 by Guishnu

[lilcrash]

Nissan epc data says pump is - 150105L800

[RRob]

I wouldn't say it "is" a N1 pump, but very similar. From memory the NEO has smaller diameter gears with the N1 profile.

[Simon-S14]

I can confirm that neo uses a n1 style pump

[JustinP]

As can I, definitely N1. I just put mine back together a week and a half ago.

[dori34]

should replace the old pump with a new one anyway. i wouldnt run a old oil pump on a rebuilt motor.

N1 pumps now are cheap as now, dont forget the oil pump collar for the crank!

[kitto]

I can also confirm that my NEO motor has an N1 pump with 77mm gears.

If your wanting to buy a new pump, please DO NOT buy a brand new N1 or any other RB25DET, RB20DET etc oil pump. They fail regularly. For some reason all pumps after a particular year of manufacture seem to fail prematurely. Some people say its around 2005 ish.

I believe the housings are ok, but the gears seem to be weaker. I would say a new pump with billet gears would be ok.

[JustinP]

That's why I reused my old N1 pump. I opened it up and checked everything and and everything looked good and the tolerances were all in spec so why not reuse it. I added the crank collar though.

I can also confirm that my NEO motor has an N1 pump with 77mm gears.

If your wanting to buy a new pump, please DO NOT buy a brand new N1 or any other RB25DET, RB20DET etc oil pump. They fail regularly. For some reason all pumps after a particular year of manufacture seem to fail prematurely. Some people say its around 2005 ish.

I believe the housings are ok, but the gears seem to be weaker. I would say a new pump with billet gears would be ok.

[Guishnu]

So we seem to have some conflicting data here chaps.

The Nissan EPC says that it's 150105L800 or an RB25DET S1/S2 pump.

But people have opened them up and said that it's a proper N1 pump which means that is should be part number 15010-24U00 or 15010-24U01.

So what gives?

[JonnoHR31]

should replace the old pump with a new one anyway. i wouldnt run a old oil pump on a rebuilt motor.

N1 pumps now are cheap as now, dont forget the oil pump collar for the crank!

problem is the original pump is probably going to be more reliable than new n1 pump. as others have said the best setup without going a full aftermarket pump (jun, nitto etc) is to replace the gears with billet ones and use a collar.

[pipster11]

as stated before

http://nissan.epc-data.com/skyline/er34/3944-rb25det/engine/150/15010/

the r34 is listed as having the r33 pump number

also, if the pump hasen't broken yet, why would you replace it with one that have been reported to fail quite often?

[dori34]

the new n1 pump in my car has been fine so far for 18 months now with over 4-6 trackdays in that time *fingers crossed*

its hit and miss with this, there have been people without an issue who ran this and still going strong after many years, and then there are the unfortunate who have failed in the first 5000km or so.

[Simon-S14]

as stated before

http://nissan.epc-data.com/skyline/er34/3944-rb25det/engine/150/15010/

the r34 is listed as having the r33 pump number

also, if the pump hasen't broken yet, why would you replace it with one that have been reported to fail quite often?

what can i say... the epc data is wrong. they are most certainly different from that of a s1/2 style rb25 pump

[bubba]

If the Neo oil pump are actually the 77mm OD N1 style gears, then I would be going Reimax gears.

I put Reimax gears in my old N1 pump but if I was to do it again, I would source a standard RB26 pump and go with the 81mm OD Reimax gears.

Cost me $430 delivered from RHDJapan.