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Is This Rb25Det A Non Neo Or Neo Engine.

ltcree

By ltcree,
in Engines & Forced Induction

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ltcree Contributor

ltcree

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Hey Guys,

Been offered an engine out of a very late series 1 stagea to go into my r33. The guy I'm buying it off hasn't opened it up but is determined that its a neo inside. It has a neo crank sensor (plastic cover) but the r33 coils will bolt up to it and not the neo coils. Now looking at the tomei website as I was going to put tomei cams in it, There is a different cam for 25's between 9/97 - 8/98. Looking on FAST at work all the parts (head, lifters etc) are the same number as all the R33 parts. The only thing in common with a R34 is the CAS. Talking to a reputable engine builder that builds race 25's, he has told me that if it has a plastic cover CAS it MUST be a neo. Has anyone come across this late S1 stagea or very late R33 type engine before and if so what internals has it got? As far as I can tell its a noraml 25 with a neo type CAS? Any help much appreciated.

Odium Grand Master

Odium

Posted
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Is the engine local to you? Might want to get someone with rb25det neo/standard experience to pop down there with you and check it out...

Are there other visual differences other than the plastic covers? Maybe get the seller to take a bunch of pics of it for you and post them up here?

tridentt150v Grand Master

tridentt150v

Posted
Posted

As far as I can tell its a noraml 25 with a neo type CAS? Any help much appreciated.

Yep, thats what it is. In 1997-98 and immediately prior to the R34 there were a few R33's made that had a few different things about them. The 40th Anniversary model was one of them. You could say they are a series 2.5, but they are not recognised as such. There is a thread some where on here with differences between models, not sure if the '98 is covered though. They are not a Neo.

If you get Tomei cams then order for the '98 R33, otherwise the CAS key will be wrong.

ltcree Contributor

ltcree

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Posted

Yep, thats what it is. In 1997-98 and immediately prior to the R34 there were a few R33's made that had a few different things about them. The 40th Anniversary model was one of them. You could they are a series 2.5, but their not recognised as such. There is a thread some where on here with differences between models, not sure if the '98 is covered though. They are not a Neo.

If you get Tomei cams then order for the '98 R33, otherwise the CAS key will be wrong.

Thats exactly what I thought. Cheers for the replys guys.

GTSBoy Grand Master

GTSBoy

Posted
Posted

Question: is the inlet manifold of late series 2 like a neo or like a 33 manifold?

The answer to this could help OP and further my knowledge aha.

Well, they're not Neo's, so they don't have any of the things that were actually different different (ie that actually matter). That's the head, the inlet manifold......

GTSBoy Grand Master

GTSBoy

Posted
Posted

R33 intake manifold will bolt onto a neo head so it is a possibility that they made them with 33 intakes.

Actually, there might be something in that. I was looking to buy a Neo a while back and I think it was at Adelaide Jap that there was an engine that they claimed was a Neo - but it didn't have the R34 inlet manifold. Engine was from a C34 Laurel. Had Neo CAS, Neo type ECU.....but looked like an old 25. But here's the kicker - the guys there said that they'd pulled the top off it and swore that it had solid lifters, just like any Neo.

So, I wonder if there is not a vague halfway motor hiding in Nissan's closet that needs investigating.

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