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power potenial. (RB26 parts)

87calais

By 87calais,
in Engines & Forced Induction

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87calais Apprentice

87calais

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Posted

Hey everyone.

Im in the process of building a new engine which will be an RB30DETT, with the RB30 block and RB26 head.

I was wondering if anyone knows the power limit of the standard cams, and the standard head. Can anyone recommend anyone in the Newcastle or sydney areas for head porting???

Thanks in advance everyone.

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Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi 87calais, maybe no one has found a power limit of the standard GTR cams. I have seen engines with over 700 bhp on standard cams. In fact I could probably get 1,000 bhp on standard cams with the right combination of other bits and by running enough boost to overcome the deficiencies of the cams. It doesn't mean that they wouldn't make more power with camshafts of higher lift and more overlap.

The more you think about it, the more silly this question is. Or at least unanswerable anyway.

87calais Apprentice

87calais

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thanks for the reply Sydneykid. Im just trying to decide how much work is going to be needed on the top end of my engine to get my desired results. I would like the engine to make around 700hp, however i dont want parts to be pushed to the limit to acheive this. I was assuming that i would need a set of cams but maybe the std head castings would flow well enough for this amount of power. Obviously support systems would be suitably upgraded.

Any thoughts?

Cheers guys.

Whoneedstherapy Veteran

Whoneedstherapy

Posted
Posted

Just looking from a different angle, if you are shooting for that amount of power the turbo your going to use obviously isn't small. It may be a good idea to upgrade the cams in order to help spool up the turbo/turbo's you choose to use in order to get a more drivable result.

I'm going for a similar combination at the moment and aside from cleaning the head up a little im leaving it alone except for the parts i need to replace for the cams im planning to use which are both around the 270 degree 10.5m lift specs.

I'll let you know how i go

87calais Apprentice

87calais

Posted
  • Author
Posted

good point.

How much lift can the cams have before the head needs to be machined, its about 10mm isnt it?

Im pretty sure im going to use twin turbos, as they are much more tractable than a big single, although you have to love the feeling of a big single coming onto boost.

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