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Anybody Rebuilt An Rb25det Themselves?

stuartlaw_78
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stuartlaw_78 Community Regular

stuartlaw_78

Posted
Posted

Hi people,

Fairly new here but been reading alot of posts on here and I have to say, I've learnt a fair bit and picked up some good tips on what to do and what not to do.

I own an R33 GTS-T and decided to rebuild the motor. My cousin and I have been around cars for a while now and have rebuilt motors before but have never attempted one of these babies! Managed to resource some parts and contacts, etc but...

--Has anybody rebuilt an RB25DET motor before and if so, have they come across any issues or have any tips for me as we are about to start in 2 weeks.

--Also, has anybody managed to find some good parts (pistons, gasket kits, bearings, etc) and does anybody know of any good brands? I've found it particularly hard to find parts for this motor. It seems easier to find parts for the RB26 motor.

Can anybody help here??

Thanks

Duncan Grand Master

Duncan

Posted
Posted

gasket kit, Nissan

bearings, ACL Race series, same as rb26

pistons, anything cheap and forged like Arias from Rockett Industries.

I would have said it was dead easy to do, but my rb26 spun a bearing again after only 2000klm...so I guess my advice now is get a good machine shop. I've never rebuilt any other engine to compare it to, but it wasn't a tricky thing to do.

stuartlaw_78 Community Regular

stuartlaw_78

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Thanks mate,

Good to know, we will be taking extreme care and I will be getting the block bored out 20 thou for the new Aries Pistons I'm getting. I actually spoke to Rocket the other day and said I could get them for $1080... Sounds pretty good.

Someone said something about torque deck boring where they use a template where the head usually goes and they bolt it to the block while boring.. This stops any distortion problems that might occur if the block is bored without the tamplate head on there because I was told that if you don't do it this way, when the real head is bolted on, the alignments can distort slightly...

I've done a fair bit of homework so hopefully nothing bad happens when I turn the key for the first time!! Think I might have a couple of drinks before I turn the key... just to relax me!! lol..

So those gasket kits, etc are ok?

Duncan Grand Master

Duncan

Posted
Posted

no idea about the machining I outsourced that. Also had the head recoed.

the gasket kit is a must there are a million gaskets involved and they should be fine everywhere. A lot of people go aftermarket metal head gasket to lower compression but that is a whole other can of worms. The standard gasket is fine at sensible boost levels. I went metal intake and exhaust gaskets but I reckon it is a waste of money.

Good luck.

GTRgeoff Grand Master

GTRgeoff

Posted
Posted

I've done a few. There are a few extra things that can be done to improve the basic engine.

GTR rods are recommended. Get them sized (if necessary) and crack tested by the machine shop. Should be under $300 for a set.

Get the crank checked for straight by the shop, and get them to supply the bearings. Plastiguaging can be easily mucked up but they do it all the time.

If you intend running high rpm/power or at the track then get the front oil feed blocked to reduce oil to the head. Oil can build up in the head and assist with starving the pickup -> bearings can go. Also think about a sump baffle if you intend to track it as well.

O ring the block as well so the stock gasket can take a significant power increase. Works out less than metal head gaskets.

Get a full balance.

Good luck

stuartlaw_78 Community Regular

stuartlaw_78

Posted
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Posted

Thanks for the info.. I'v e been speaking to a guy from a place called "Salibro or Salibo Engines". He has been extremely helpful and sound like he knows what he is doing.. I'm going to take the block to him and get him to do everything that needs to be done... ie... torque plate boring, honing, dynamic balancing, square decking and much more.. He mentioned something about him doing the bearings but he lost me there..! He was going to do something with them so that they would be 100% reliable when we put the engine back together...

Does anyone know how much the block will have to be bored for a 1st rebuild? I'm guesing that 20thou will be enough.. I can get a set or Aries pistons, rings, etc for $1080... but should I wait until the guy has checked out the block before I go buying the pistons just in case he needs to bore it out more then 20thou?

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