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Rb25 Head Rebuild

AlpineFreak

By AlpineFreak,
in Engines & Forced Induction

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FineLine Grand Master

FineLine

Posted
Posted

he is aiming for 380kw though, certainly not low, but not some 500kw monster that needs it to get the power.

Its easy to become indifferent to numbers but 380 wheel watts is a friggin lot of power.

Do A nicely balanced head to suit and it will make that power more efficiently with better boost and torque characteristics too.

AlpineFreak Enthusiast

AlpineFreak

Posted
  • Author
Posted

Thanks for the feed back so far gents..

Its good to see other peoples opinions on head work re the RB..

380rwkw was just a figure I pulled from the sky, I use to drive it at 300kw so I was merely adding a reasonable factor on top.. Hell the more power I can screw out of her the better.. But in reality I want to make sure I do everything right. Keeping in mind I'm still retaining the purist RB25 standard capacity approach..

As for 5K worth of slicks, well I'm sure that could occur but far far later down the track as well its still in bits/undrivable at this point in time..

Now another question, I have heard that the bronze guides have a pretty quick wear rate?? If this being true is there any other guides in which I can use?? Keeping in mind I want to use the 1mm oversize valves..

Cheers..

FineLine Grand Master

FineLine

Posted
Posted

Thanks for the feed back so far gents..

Its good to see other peoples opinions on head work re the RB..

380rwkw was just a figure I pulled from the sky, I use to drive it at 300kw so I was merely adding a reasonable factor on top.. Hell the more power I can screw out of her the better.. But in reality I want to make sure I do everything right. Keeping in mind I'm still retaining the purist RB25 standard capacity approach..

As for 5K worth of slicks, well I'm sure that could occur but far far later down the track as well its still in bits/undrivable at this point in time..

Now another question, I have heard that the bronze guides have a pretty quick wear rate?? If this being true is there any other guides in which I can use?? Keeping in mind I want to use the 1mm oversize valves..

Cheers..

I'll say this quietly in case Nismoid is listening.

Use the factory iron guides, they are more durable than the bronze jobbys.

Dale FZ1 Veteran

Dale FZ1

Posted
Posted

Getting the engines breathing characteristics to suit the other mods is the key to unleashing the true potential of your build.

Every performance category be it, drags, marine, Tractor pulls, circuit,N/A Forced induction or whatever has had countless hours of time and money poured in to developing cylinder heads simply because that is where Real horsepower benefits and torque characteristics to suit the application can be found.

Mismatching parts, and not understanding the application is where things seem to come unstuck.

Best example I've seen many times over is using drag spec engine+head mods in ski boat engines. Different discipline, different requirements, need different parts and approaches to specs and modifications.

darrinspencer Grand Master

darrinspencer

Posted
Posted

Have you considered swapping the motor or maybe head to a neo rb25det

Head has soild lifters, larger exhaust valves already

Not sure if the stock neo head will make your power goal, but with researching.

May work out alot cheaper

DR 32R Rising Star

DR 32R

Posted
Posted

Have you considered swapping the motor or maybe head to a neo rb25det

Head has soild lifters, larger exhaust valves already

Not sure if the stock neo head will make your power goal, but with researching.

May work out alot cheaper

+1 If you can find one to start with.

AlpineFreak Enthusiast

AlpineFreak

Posted
  • Author
Posted

Question..

What supertech cam followers do I need to purchase if I choose to use the Tomei 270/10.25mm cams??

I've been told there are 29mm and 31mm base circle styles..

Cheers..

christo76 Apprentice

christo76

Posted
Posted

Hi,

Looking for some help with cams... I've just bolted up a GT3076 with internal gate to my RB25 series 1 and I have a pair of Tomei Poncams 256 degree 8.5mm lift I would like to drop in. I'm not looking to get any real power gains from them, but just to move the powerband round, for more response and and earlier spool up, would these cams be adequate for the job? The cams came with the option VCT retained, what is this about and is there any tutorials or DIY's on instalment of these cams?

NISSAN SKYLINE R33 GTS-T series 1 RB25det

Garrett GT 3076

CHRA(CORE)

700177-5007

COMPRESSOR HOUSING

436157-0023 (SURGE SLOTTED)

COMPRESSOR HOUSING AIR RATIO

0.60

COMPRESSOR WHEEL INDUCER SIZE (MM)

57.00

COMPRESSOR WHEEL TRIM

56

18 PSI ACTUATOR

-Apexi Power FC

-Apexi AVC-R

-Nismo 740cc injectors

-Z32 AFM

-Walbro Intake fuel pump 255l/hr 500hp rated

-Tomei Poncam intake and exhaust 256 degree 8.5mm lift

-Super Spark coilpacks

-NGK Laser Platinum PFR5G-11

-Apexi Power intake

-3' Exhaust turbo back

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