N-1 vs std oil pump

[The Alchemist]

got my N-1 oil pump yesterday and took it apart to compare to my std R32 GTR oil pump...(2 screws worked loose as they do )

here are the differences for interest sake:

1: the relief spring

std has a twin spring system N-1 has a single...both measured identical spring rates at 3 different heights starting from the installed height.

Interestingly the N-1 relief plunger has a small oil hole drilling about 8mm down from the top edge, level with the relief oil passage in the pump housing. This would have a dampening effect on the way the relief valve works as the spring cavity would have a head of oil in it that would have to squeeze out the small oil drilling first.

Plunger size was the same and relief valve cavity was the same.

2: the oil pump gears are where the biggest difference lies.

The N-1 inner gear has 1 less lobe (11) vs the std which has 12...this allows the internal volume of the pump gears to increase using a redesigned shape on the outer gear/inner gear meeting surfaces. We didn't CC the difference as the N-1 was obviously much larger than the Std R32 gear.

3: The gear hardness and material...

a hardness test was performed using a proper hardness tester in the machine shop. The std gears were a 0.56 and the N-1 scored a 0.96 a marked difference!

Also the gears were made out of the same material!! Sintered steel.

The major reason , I believe , that the N-1 gears have been hardened is that in order to increase the pumping volume the outer gear wall thickness has been dramatically reduced thus hardening is required to keep the strength up.

4:Internal channels are all larger in the pump housing and redesigned to increase flow

5: the pump backing plate has a redesigned screw fixing arrangment with an extra screw on the N-1 ( 8 screws vs 7 in the std ) Also the backing plate is 0.5mm thicker ( 6.5mm on the N-1 vs 6mm on the std )

A note worth noting the backing plate screws were not lock tighted, needless to say that they where during reassembly!!!

Cheers Mike

[RB26zcar]

Great info there mate...... It's good to see hard evidence of the N1 being a upgrade of the standard Nissan pump, after constaint reports of it being the same pump, with just a stiffer spring....

[GTS-t VSPEC]

Nice to see someone doing some proper testing:cheers: I bought an HKS Oil Pump, hopefully it was worth it over the N1 pump:D

[GTRgeoff]

Good stuff. I had been led to believe the N1 was just a higher spring rate on the relief so it's good to see some testing.

What I have confirmed from FAST is that the RB25DET and RB26DETT oil pumps flow exactly the same amount, but it doesn't detail any defferences in construction, so to all intents it is the same pump. I can't recall if the part number was different.

[bmxwrx]

Tell us the price son!

What do these commonly go for? and is it brand new?

[[[d a n n y]]]

the N1's go for around 500+ but under 600

[The Alchemist]

$850 NZ.

The Rb25 and the R32 GTR pump are indeed the same. We also happened to have one off a dead Rb25 and compared the two.

Interesting how the relief spring have the same spring rates eh?

Isn't the HKS pump worth a small fortune ??

Mike

[GTS-t VSPEC]

Yes the HKS pumps is a small fortune:( But I'm lead to believe it is superior to the N1, I hope so:D

[Gav]

I picked up a used Trust pump for around the same price as an N1 and as GTS-t VSPEC says hopefully it is better than std.

Didn't happen to have a squizz at it when it went on did ya Paul?

[GTS-t VSPEC]

Gav, As far as I'm aware both the Trust and HKS pumps have improved designs compared to the N1 pumps. I can take pics of my HKS pump as it's not on the engine yet, maybe someone will be able to see what differences there are.

[Cefiro_PWA]

Gav, As far as I'm aware both the Trust and HKS pumps have improved designs compared to the N1 pumps. I can take pics of my HKS pump as it's not on the engine yet, maybe someone will be able to see what differences there are.

please show us pics

[GTS-t VSPEC]

Will try and take some on Monday, and have them up on Tuesday so people can do a comparison.

[The Alchemist]

that would be good.....didn't have a camera handy when I took the N-1 apart bugger it...thats why I took all the details down on paper.

[wrxkilla]

yeah im very sure the HKS, JUN & Tomei oil pumps flow alot more than an n1.

i lost my info, maybe search the web for the details...

mick

[Genesis®]

great info

should go into the FAQ section