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Rb26 Crank In Rb25

adamsrotor

By adamsrotor,
in Engines & Forced Induction

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adamsrotor Enthusiast

adamsrotor

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hey guys, im currently under the build of a rb25 for my s13 silvia. lookin at fully forged bottom end with cams n porting up the top and plenty of the usual stuff... already got most the gear. the thing im not sure about is what to do about the oil pump drive, either im thinking just wack on a crank collar and a oil pump to suite. believe a late 32 gtr onwards pump will fit?? also many aftermarket options. OR... is it just as easy to put a 32gtr onwards crankshaft (long crank) on with rb26 oil pump and aftermarket rb26 pistons and rods to suite? and this would fix the oil pump drive issue? any info on puttin the rb26 crank in a rb25 would be helpfull. thanks guys, adam.

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adamsrotor Enthusiast

adamsrotor

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anyone else got any ideas??? im about to order pistons from usa so i need to make sure that all i need is cp pistons to suite a rb26, rb25/26 eagle rods and then source a long crank here. are all the crank main journals the same? thanks again.

adamsrotor Enthusiast

adamsrotor

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honestly? i have already purchased the pistons and rods... going to look at a crank shaft tomorrow night. what about oil pump? ive heard the only diff between N1 and stock is higher oil pressurer which is acheivable through installing a shim in the standard pump pressure relief valve anyways. is this true or is there more to it? thanks.

I would use a gtr crank and pistons. Dont bother with rods, dirtgarage is(was) selling a set of cleaned up stockers that are stronger than most aftermarket ones. He made over 400awkw with a set of stockers.
Adriano Grand Master

Adriano

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Ive also heard that the r33 gtr pump and the n1 are identical apart from the relief valve, however they cost about the same. What pistons did you end up getting, rb25 or 26, that will depict what crank you have to run.

Edited by Adriano
Sydneykid Grand Master

Sydneykid

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honestly? i have already purchased the pistons and rods... going to look at a crank shaft tomorrow night. what about oil pump? ive heard the only diff between N1 and stock is higher oil pressurer which is acheivable through installing a shim in the standard pump pressure relief valve anyways. is this true or is there more to it? thanks.

Which "stock" oil pump are you comparing the N1 to?

An early R32GTR "stock" oil pump? The N1 pump has the wide drive flange, the early R32GTR oil pump doesn't, they have the narrow drive flange. The N1 oil pump also has a different rotor configuration and the higher oil pressure relief valve.

A late R32GTR "stock" oil pump? They both have the wide drive flange,but the N1 oil pump also has a different rotor configuration and the higher pressure relief valve

An R33GTR "stock" oil pump? They both have the wide drive flange, but the N1 oil pump also has a different rotor configuration and the higher pressure relief valve

An R33GTR V SPec "stock" oil pump? They both have the wide drive flange and the same rotor configuration, but the N1 oil pump has the higher pressure relief valve

An R34GTR "stock" oil pump? They both have the wide drive flange, the same rotor configuration and the higher pressure relief valve

Simple isn't it?

But wait there is more. Nissan has superceded some part numbers, so even if you order an early R32GTR pump you will most likely get a late model one anyway.

Cheers

Gary

adamsrotor Enthusiast

adamsrotor

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Ive also heard that the r33 gtr pump and the n1 are identical apart from the relief valve, however they cost about the same. What pistons did you end up getting, rb25 or 26, that will depict what crank you have to run.

i got cp rb26 pistons, hopefully get long crank tomorrow night

adamsrotor Enthusiast

adamsrotor

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Which "stock" oil pump are you comparing the N1 to?

An early R32GTR "stock" oil pump? The N1 pump has the wide drive flange, the early R32GTR oil pump doesn't, they have the narrow drive flange. The N1 oil pump also has a different rotor configuration and the higher oil pressure relief valve.

A late R32GTR "stock" oil pump? They both have the wide drive flange,but the N1 oil pump also has a different rotor configuration and the higher pressure relief valve

An R33GTR "stock" oil pump? They both have the wide drive flange, but the N1 oil pump also has a different rotor configuration and the higher pressure relief valve

An R33GTR V SPec "stock" oil pump? They both have the wide drive flange and the same rotor configuration, but the N1 oil pump has the higher pressure relief valve

An R34GTR "stock" oil pump? They both have the wide drive flange, the same rotor configuration and the higher pressure relief valve

Simple isn't it?

But wait there is more. Nissan has superceded some part numbers, so even if you order an early R32GTR pump you will most likely get a late model one anyway.

Cheers

Gary

i was refering to a late model, since thats the crank i will be using. the main reason i decided to go to a rb26 crank in the 1st place was to fix the oil pump drive issue. thanks for the info sk, so pretty much im better off just goin N1 by the sounds of it. is the cheapest option getting it through nissan for trade price or does someone know somewhere else that sells them cheaper. i see spool on ebay has them for $390... cheers

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