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What Fits In What Rb Engine?

HYBRID VL

By HYBRID VL,
in Engines & Forced Induction

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HYBRID VL Community Regular

HYBRID VL

Posted
Posted

Reading an article the other day in Zoom i think it was a guy had an RB30/26 setup which i well known to everyone as is the head/block combos but after reading his setup infact he has a RB30 with a RB25 head with RB26 internals in the head now i wasnt sure if this was exactly possible i have heard of people saying "my RB25 head is RB26 spec or better" but not RB26 internals and if so how many other parts and internal parts are swappable?

I did search for this maybe just wasnt using the right words if there was somthin on it.

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Just means he wasted time puttingh RB26 cams or something into a RB25 head - as that is all such a conversion is, waste of time :P

You can do anything you want really, just need money.

As for the mods actually being beneficial/worth the time, that is a whole other story.

GTRNUR Grand Master

GTRNUR

Posted
Posted

Could it not also mean it was a RB25DE head and the valve springs were changed to RB26 items?

I think I read that was done somewhere in one of the hybrid build documents ive seen floating around. Dont ask me though.. i'll leave head building for my machine shop.

GTRNUR Grand Master

GTRNUR

Posted
Posted

If you can get another look at it, it would be helpful. Look for the VCT solenoid next to the intake cam gear above the coolant out hose. If its there, (or removed and plugged), then you have a RB25DET head.

Otherwise its a RB25DE head (non vct), which is a direct bolt on to the RB30 block. As well as they use a similar valvetrain to an RB20, so they can be upgraded with RB26 parts. IE, springs, cams and lifters.

Rb25DET's use a hydraulic lifter so the 26 liftes arent compatible for that head.

TiTAN Grand Master

TiTAN

Posted
Posted
Was it a car from Canberra?

If so, thats Fitspatrick SPeed Works (yes, he's on these forums every now and then)

i thought that car was running 26 head with a 25 block as they broke the 26 and had a spare 25 they werent using.

or is that one of the other ones?

bubba Grand Master

bubba

Posted
Posted
If you can get another look at it, it would be helpful. Look for the VCT solenoid next to the intake cam gear above the coolant out hose. If its there, (or removed and plugged), then you have a RB25DET head.

Otherwise its a RB25DE head (non vct), which is a direct bolt on to the RB30 block. As well as they use a similar valvetrain to an RB20, so they can be upgraded with RB26 parts. IE, springs, cams and lifters.

Rb25DET's use a hydraulic lifter so the 26 liftes arent compatible for that head.

RB20DET and RB25DE (R32 - non VCT) are hydraulic lifter heads aswell..

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