PING: Anyone currently getting ready for assembly.

[JD74]

I am looking for help from a couple specific people.....and hopefully we can find them here as Winter is approaching and the builds are about to get going in full force.

Here's what I would like:

OIL PUMP INNER PICS.

It would be nice, that when you pull your BRAND NEW Oil Pump's backing plate, to re-seal and locktight.....that you take a couple of pics.

Pumps most interested in:
- Nismo
- Jun

I already have OEM and N1 pics that I 'borrowed' from another Forum.



In the last while, Jun Pumps (2 that I know of) have been suffering from Gear Damage, as well as the odd casing crackage and I just wanna see inside and compare to the actuall 3 Nissan Pumps. I saw pics of the Jun dmage, I just have to re-find them on either AUS or UK Forums.

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Why ?
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Well, I am about to order a Reimax Gear Kit for an N1 Pump I have....if I don't sell the package first that is.

What I know:
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* A Nismo Pump flows the same as OEM.
* An N1 Pump Flows similar, but higher pressure.
* Reimax (was Reinik) is/was an Engineering Arm of Nissan/Nismo and was responsible for GT500 and N1 Engineering/Production/Reasearch and Development.
* 'Classic' GT/Group A Oil Pump would have been a Reinik/Reimax.
* Reimax sell 2 sizes of Rotor/Gear Upgrades/Replacements (77mm + 81mm) for OEM + N1 Pump casings.

What I am aiming for:
---------------------
I believe that I can make the best of a bad situation and actually BENEFIT in the process......
N1 Pump casing + Reimax Gears = Better than Nismo (and I ALREADY HAVE THE N1 Pump) because of stronger gears (perhaps the SAME reimax gears actually) BUT higher pressure.

As always,
Thanks for reading.
Allan

[JD74]

Reimax Site:

http://www.reimax.com/

Direct to Gears (and other stuff, 'lower engine area' as they call it):

http://www.reimax.com/pages/products/lower-area.html

RHD Japan:

http://www.rhdjapan.com/jdm-low/Reimax-Oil-Pump-Gear-Kit-Skyline-GT-R-RB26DETT-54021

[JBNR32]

Just go Tomei, best of the best. You'll probably need a sump extension if you do because I hear the tomei pump and suck a stock sump dry.

Johnny

[Terrh]

Count the number of teeth too

I posted this picture a while back (in like, january?)... I took my OEM pump and N1 pump apart, clearly they are NOT THE SAME PUMP.

Anyways, the N1 pump certainly looks more fragile, if you measure the minimum thickness on the outer gear with the N1 vs. stock, stock is nearly twice as thick.

I don't believe that they could flow the same with different size gears and a different number of teeth.

[mcfly]

I had pictures of the Jun pump guts, key word being had of course.


I also have to jump on terrh's post, the n1 gear does look wimpier, but the inner gear has more meat. no pump i have seen has broken the outer gear.

I have kismets broken jun gear here

http://gtrpwr.com/?p=59

[JD74]

Looks like them guys from 'Down Under' are at it again.

From necessity comes innovation......

http://www.skylinesaustralia.com/forums/Rb26-Oil-Pump-gears-t240582.html&mode=linear

Hardened gears for N1 Pumps and notice the thicknesses.....

$500 AUS seems like a steal.

From an email to another forum member from POWERTUNE.....

Yes, they are modelled on the N1 gear set so are exactly the same size.

The difference between our gear set is the material they are made from which is a pre-hardened alloy composite and as such does not require heat treatment.

As a performance part, we regret that we cannot offer warranty. We developed these gear sets out of necessity as many of our customers had broken so many of the N1 gear sets.

We made our first set in 2006. It was put into a 400kw GTR and is going strong.

[JD74]

...and here is the Reimax Gear set:

[JD74]

I also have another idea......

Can someone measure the OUTSIDE DIAMETRE of a STOCK PUMP Gear Set ? if possible ?

I will measure the N1, since I have one in front of me.

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Here's what I think:
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Since Reimax are offering both a 77mm and 81mm Gear Set, I think that a STOCK PUMP will have an outside diametre or 81mm.....and an N1 possibly 77mm ?

If this is the case, I think that people that not only bought the N1 may have an 'out' when it comes to a rebuild......but maybe even the guys that bought a stock pump as well.

In short, if you are stuck with the wrong pump, there may be hope without entirely scraping the pump you have.....and I am willing to be the guinea pig.

Even though a Nismo Pump is well under $900 most of the time, it may make sense to buy a Gear Set for your mistakingly bought pump and call it a day.

The stock pump + Gear set upgrade would = Nismo.
The N1 pump + Gear set upgrade would then = Nismo + higher pressure.

I will wait to see the diametre of the stock gears.
Thanks.
Allan

[JD74]

Jesus H Christ !

I think King Kong was working at the factory the day this N1 Pump of mine was assembled.....because there is NO WAY I can budge these screws by hand with a screwdriver (I promise, I'm not really a pu$$y....lol)....and I believe that I just blew out a Nut trying.......Any Suggestions before I burst anymore blood vessels in my forehead ?

EDIT...
Forget it. The old 1/4" socket + phillips head did it...lol
I hate not having all the right tools in the house.

[GTR-Dad]

^^^ a bit of heat works wonders too.
Dan

[EtienneGignac]

My bolts were not even close to being hard to remove...

Outside diameter of outside gear is exactly 3.2 inches or 81.28 mm.

[JD74]

My bolts were not even close to being hard to remove...

Outside diameter of outside gear is exactly 3.2 inches or 81.28 mm.

That must be the STOCK PUMP then ? - 81mm

I just measured an N1 Pump, it was - 77mm (about 10mm height, or thick not including collar extrusion)

Looks like the Reimax Gears are meant for both as replacemeents.

[EtienneGignac]

Yup that's for for the stock pump.

[EtienneGignac]

You seem to have done your homeworks on the subject...

how do these things fail usually ? Sheared teeth ?

[JD74]

You seem to have done your homeworks on the subject...

how do these things fail usually ? Sheared teeth ?

N1 Pumps fail by way of shattered inner gear.

I believe that this is mostly due to people not respecting Rev Limiters and not using Balancers....or balancing a rotating assembly prior to install.

RHD Japan was SHOCKED to hear (I read on GTR UK) that we, in North America and anywhere OUTSIDE OF JAPAN have this problem - but it should seem clear why it happens, no ?

In Aus/NZ, they run 700 HP cars on N1 Pumps because they are smart enough to:
1) Balance rotating assembly.
2) Use a proper Harmonic Balancer.
3) Respect the Rev Limiter (and sometimes not).

Here. Have a look at Rick's Specs (he's also a member here), on his 'Saurus' built JDM 'Power House':

http://www.cardomain.com/ride/447636

....notice the N1 Pump ?

I even googled to find a couple other cars that Garage Saurus did, also using N1 Pumps.

We, the Red-Neck-Haywire&duct-tape-north-americans have created most of the N1 Oil Pump Failure Internet Phenomenom from our own crappy builds......simple as that.