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Rb25/30 Engine Build

shanef

By shanef,
in Engines & Forced Induction

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The Dan Grand Master

The Dan

Posted
Posted
has anybody done this conversion with the rb25det head? if so i need help with it wat is needed for the prep of the block for it to go on and run properly and with the vct how will that work on the 30 block? if any body can help it would be greatly appreciated....thankx in advance please pm me or email me at [email protected]

Have done a couple of these now. There are a couple of places you can run the vct from but I think, ultimately the turbo oil feed will work best.

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how did you manage a double post.. in the one post? hahahahaha but good point.. points.. twice..

Omurru Veteran

Omurru

Posted
Posted
fark talk about bringing up an old thread, i read back now and go, oh my did i say that? :)

P.S mine's still not running yet :)

lol can't say I noticed, I just posted ;)

hmmm really need to set aside an afternoon one day just to read the conversion thread...might actually learn something....

The Dan Grand Master

The Dan

Posted
Posted
i reckon the ops feed is better...shorter length of line to run and it doesnt have to cross the front of the motor.....but it probably doesnt matter.

It is a good place to take it but I have had the problem of bleed off causing the oil pressure light to come on at idle...even though the pressure was fine.

Marco-R34GTT Grand Master

Marco-R34GTT

Posted
Posted
Well I'm in the process of building a new engine for my R33. Now the engine that's going into it is an rb30 bottom end with an rb25na head. I'm after a high power engine, round the 500rwkw mark.

What RPM and boost levels are you thinking of reaching???

shanef Grand Master

shanef

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  • Author
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What RPM and boost levels are you thinking of reaching???

it'll prolly need around the 2bar for that type of power. i've changed cars to a gtr and hence doing the 26/30 conversion. limiter will be set around the ~8000rpm mark

Marco-R34GTT Grand Master

Marco-R34GTT

Posted
Posted

After being a 'no so' proud owner of a VL commodore. I can say this much from what I've seen on Justcommodore's forum. The RB30 doesn't like going much past 6500 RPM. I could only advise getting a new crank, stronger ends/mains and somehow reinforce the bottom end, I don't know the exact term, but I know Mine's tuned RB26dett strengthened the bottom end of the RB26, if you want the RB30 to go past 6 1/2k, then somehow your going to have to do something similar...

big $$$$'s from what I can gather....

shanef Grand Master

shanef

Posted
  • Author
Posted
After being a 'no so' proud owner of a VL commodore. I can say this much from what I've seen on Justcommodore's forum. The RB30 doesn't like going much past 6500 RPM. I could only advise getting a new crank, stronger ends/mains and somehow reinforce the bottom end, I don't know the exact term, but I know Mine's tuned RB26dett strengthened the bottom end of the RB26, if you want the RB30 to go past 6 1/2k, then somehow your going to have to do something similar...

big $$$$'s from what I can gather....

dont worry dude it's all sorted :D

Dobz Experienced

Dobz

Posted
Posted

i'd just get an r33 rb26 and build that. The 26 will be able to get up to 500kw and probably cause you a lot less headaches along the way.

At least then you can have oil squirters as well which are pretty important if you want help maintain reliability in a high power setup.

when pushing the power you want out of a custom 26/30 engine the most important thing you need is someone who has already done it an got big reliable power.

they would know about the problems that can arise in these engines at big power numbers.

good luck

shanef Grand Master

shanef

Posted
  • Author
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i'd just get an r33 rb26 and build that. The 26 will be able to get up to 500kw and probably cause you a lot less headaches along the way.

At least then you can have oil squirters as well which are pretty important if you want help maintain reliability in a high power setup.

when pushing the power you want out of a custom 26/30 engine the most important thing you need is someone who has already done it an got big reliable power.

they would know about the problems that can arise in these engines at big power numbers.

good luck

again, i've got everything sorted out :)

shanef Grand Master

shanef

Posted
  • Author
Posted
You dont happen to have squirtes fitted to your block do you? I want to but the machine shop wont do it as they say its too thin.

nope, too much dicking around, and ur not garuanteed it'll work! just ceramic coat the pistons :)

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