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Questions About Crank Dampers For Rb25/26

sh0velman

By sh0velman,
in Engines & Forced Induction

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sh0velman Newbie

sh0velman

Posted
Posted

Hey guys, new member here, long long long time lurker (reading but not posting).

We're in the midst of an RB25DET NEO build for an S14 (240SX) and I am running into an issue...

The engine we have is from an R34 GT-T and when we pulled the stock damper off, it kinda fell apart. So we need to buy a new one, but I'm trying to understand why RB26 spec units are half the price of an RB25 spec unit, and also to understand which version I really need for a NEO engine.

One piece of information I have found indicates it's the crank snout difference between the RB25 and 26, but I've also read that the NEO has the same specs as the 26 in that respect...

Does anyone here have any other information on what is different and why we should pay double the cost for a 25-spec unit?

TY!

sh0velman Newbie

sh0velman

Posted
  • Author
Posted

supply on demand... more demand for a 25 balancer i guess?

also you will find the power steering belt is different on the 25 to the 26.

Yes I understand the economic reasons for price differences... :P

I'm asking if there is a mechanical or functional difference between parts made for the 25 vs the 26.

IE, why couldn't I use a 26 instead of a 25? :)

Ben C34 Grand Master

Ben C34

Posted
Posted

It's a good question, as for the sake of a new belt it would still save money running the cheaper balancer. Not sure what the differences are myself, but I have a neo balancer on my rb30 crank.

89CAL Grand Master

89CAL

Posted
Posted

Really depends if it under-drives or over-drives. I'm not sure if you can use the power steering pump off a GTR and it will work fine. I got my Ross Balancer for a touch over $600 which wasnt to bad

sh0velman Newbie

sh0velman

Posted
  • Author
Posted

Thanks for the replies, all.

I should say, we are planning on putting an N1 RB26 crank into the engine, so I know that the 26 dampers will mount to the crank..

I was mostly worried about belt positioning, ie, the distance between the block and the accessory drive pulleys, being different.

If the only issue is belt length, well, that's not really an issue, we can figure out what length of belt is needed. :)

Anyone have any input on using a 26 damper on a 25, aside from belt length concerns?

TY!

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