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Neo Oil Pump Question

Guishnu

By Guishnu,
in Engines & Forced Induction

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kitto Mentor

kitto

Posted
Posted

There is also another issue that is well overlooked that myself and a friend are currently working out.

The issue is most of these after market crank collars have too much tolerance between the collar and the inner gear drive surface. Its believed this is causing the inner gear to violently move around inside the housing and crack itself and or the outer gear.

This is a known issue which is found here;

http://forums.gtrcanada.com/gt-r-tech/46419-reimax-collar-clearances-pics.html

There was a guy making collars that had a better tolerance but he no longer does them.

It seems like you almost need a custom collar to suit which type of gears you have.

My friend had bought a brand new N1 pump and the pump actually failed on idle. Now we believe the pump had actually cracked while at higher RPM but it just let go when the engine was at idle.

The second pump he put in was an RB25DET pump with billet gears. The tolerance was so loose that the pump gears that were moving around all over the place actually cracked the pump housing and caused oil to leak externally. He thought it was the front main seal. But close inspection revealed a cracked housing.

bubba Grand Master

bubba

Posted
Posted

^^ and that is why I had my machinist weld up the snout of the crank and machine it back to suit my gears ;)

Some people don't like it but if done properly it's fine, works for us in a few engines and one is making 580awhp and gets regularly abused with 8500rpm limiter launches (different oil pump to me though).

Oh and NEW balancers!

Moodles2 Grand Master

Moodles2

Posted
Posted

With that link, those clearances were only checked while cold. The metal will have expanded at operating temperature, so heating up the metal to operating temp and then checking the clearances would make it more clear.

kitto Mentor

kitto

Posted
Posted

With that link, those clearances were only checked while cold. The metal will have expanded at operating temperature, so heating up the metal to operating temp and then checking the clearances would make it more clear.

Yes of course this needs to be taken into consideration.

Its hard to work out exactly how much tolerance you need on them when cold.

  • 3 years later...
Stephen Thorpe Proficient

Stephen Thorpe

Posted
Posted

Hi everyone, sorry for revisiting this old thread but it is the only one that had activity on it when I did a search for the Oil Pump Part Number I need.

My Oil Pump has failed and according to Nissan it is 150105L800 for a 1997 RB25DET.

So it seems that the N1 Pump is interchangeable with this part Number and it is better because it has hardened gears inside the pump and is less likely to fail.

Think the N1 updated part number is 1501024U01 (according to the Net) but I have no idea if this will fit the same way.

Any ideas... ?

From what I understand it needs a Crankshaft Collar to work properly as there appears to be excessive clearance but if the collar is too large it could cause the pump to crack.

So for a daily driver, pretty much standard, do you guys think it might be safer to go to the standard item?

It makes similar pressure and flow I am presuming and I don't need to worry about Thermal Expansion of a Crankshaft Collar ?

Cheers

Stephen

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