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Rebuilding Rb26 Bottem End, Is There Anything I Am Missing?

BNR32t

By BNR32t,
in Engines & Forced Induction

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BNR32t Proficient

BNR32t

Posted
Posted

Hi guys,

I am just about to rebuild my Rb26 from my r32 gtr and i am just getting prices and considering other brands.

If there is anything else i need please let me know.

What i have in mind so far,

CP piston

Includes rings, pins, locks

Eagle RB25/26 H-beam Conrods

ARP 2000 bolts

ACL

Gasket set

Conrod bearings

Main bearings

And i intend on upgrading my oil pump at the same time, Not sure what else i will need from a 93 rb26?

N1 Oil pump

Jun Crank collar

I was also woundering how much power the standard crank and block can take?

Thanks heaps for you input.

Reason for rebuilding is my current compression,

is as follows,

Cyl 1 138psi

Cyl 2 140psi

Cyl 3 15psi (no typo)

Cyl 4 140psi

Cyl 5 190psi (with oil in cyl)

Cyl 6 138psi

All readings are with an egine that hasn't been driven in a few weeks with the exception of Cyl 5 that had some oil placed in the chamber to see what the compression would be like.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Ok questions to begin

What power are you aiming for?

What turbos are being used?

Who is doing the build, have they builts RB's before?

Whats the intended use for the car?

Do they know about oil mods? http://www.skylinesaustralia.com/forums/in...howtopic=110680

Why not just purchase a new crank? $1100, cant go wrong.

Thats just the start :)

BNR32t Proficient

BNR32t

Posted
  • Author
Posted

Not aiming high hp yet the engine will have stock heads.

its got hks turbos ATM not sure of type.

I am just making sure i have all the (major) parts i need.

Just after a bullet proof bottem end.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

So you intend to aim for big power (400rwkw+) or not?

Cause you dont really need rods if thats the case, undue expense that can be put somewhere else :)

Whos doing the build? Thats a crucial part as building a decent long lasting RB isnt that easy.

BNR32t Proficient

BNR32t

Posted
  • Author
Posted

as far as power i will be looking (in time) for the 1000hp fly wheel power, Thus the rods. So i am woundering how much the crank can take reliably?

For now i will just have standard cams and heads so i am not expecting much. 3 to 400 rwkw would be nice

STATUS Grand Master

STATUS

Posted
Posted
lol or just 400rwkw.....what on earth are you going to do with that? why is 400kw the new 300kw?

haha i remmeber thinking i "must" have 350rwkw (FD3s) when i got it..... i wished i had what i had before i started.... 300.... too much power is more a pin in the ass than it is fun... shit is forever breaking.. power will always be pub talk and pub talk always raises the bar higher and higher :)

back in my day my old v8 clunker with 280rwkw was a weapon now i do a quick edit on a stockie and pull this :( but 400rwkw.... f**k me where do you drive such an animal and what would you use it for?

Roy Grand Master

Roy

Posted
Posted

The only thing that makes an engine bullet proof is tuning and engine monitoring. You can have all the best internals in the world.(and there is no way what you have posted would go near supporting 650rwkws) and an engine die a sad death because it was poorly tuned. Or the minute it htis boost the oil temps go through the roof, ditto the coolant temps. Ditto the loads through the gearbox and driveshafts. Not to mention the shear volume of air your engine needs to flow at that power, meaning you will need a big high flowing intercooler and a well thought out exhaust system... You are talking major engineering work for the car to work well as a whole

So getting back to your "happy with 400rwkws", provided you have a solid foundation then it is achievable. But be careful, not many places you can actually enjoy such a powerful Skyline...and just be sure you have oil temp and coolant temp under control for basics. But ensure you have sufficient oil flow and pressure in the engine. Ensure you have good fuel supply, and robust. Nothing like a faulty/clogged injector that kills and engine. Ditto a fuel pump that doesnt get lazy at the flow you require.

Sit down and have a serious conversation with an owner of a 400rwkws GTR, i think you will be surprised its nto as easy or cheap as many think

BNR32t Proficient

BNR32t

Posted
  • Author
Posted

I will be happy with around 250awkw's, if money permits building a bigger motor later i might do that.

Do people recomend upgrading the oil pump? or is the stock pump fine?

Cheers

Blitz Grand Master

Blitz

Posted
Posted

Seriously, what is it, 250kw, 400kw, or 1000 Flywheel HP? - There are massive differences in these setups.

If you intend to be able to produce 1000 HP down the line, then you need to build the motor correctly now, or be prepared to build it again later. I would suggest sourcing an N1 block as the base if you are *really* going to be chasing such HP levels.

There are a number of areas you haven't mentioned yet that are going to need attention

- Injectors & Fuel system?

- Camshafts?

- Sump/baffle setup

- Headwork?

Basically, for anyone to properly advise you of what you do and don't need, you need to more accurately identify what power you are going to chase from the get go

Blitz Grand Master

Blitz

Posted
Posted
Do people recomend upgrading the oil pump? or is the stock pump fine?

Cheers

Short answer, yes - You will need a new pump and for high horsepower reliability I would be looking at a JUN or equivilent pump.

Theres another $1200 + right there.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Seriously, what is it, 250kw, 400kw, or 1000 Flywheel HP? - There are massive differences in these setups.

If you intend to be able to produce 1000 HP down the line, then you need to build the motor correctly now, or be prepared to build it again later. I would suggest sourcing an N1 block as the base if you are *really* going to be chasing such HP levels.

There are a number of areas you haven't mentioned yet that are going to need attention

- Injectors & Fuel system?

- Camshafts?

- Sump/baffle setup

- Headwork?

Basically, for anyone to properly advise you of what you do and don't need, you need to more accurately identify what power you are going to chase from the get go

Agreed.

First 1000hp @ the fly, then 300-400rwkw, and now 250rwkw.

All different costs, all different builds, all require different responses.

1q2w3e4r Enthusiast

1q2w3e4r

Posted
Posted

You should listen to some of these guys as they are giving you good advice. 1000hp is a rediculous amount of power, and you'd be throwing well in excess of $50k at it initally to do it properly without on going running costs etc

400rwkw is a boat load of power for a street car that sees track use occasionally.

Ditch the N1 oil pump, they are shit at high power levels and get a JUN item like has been recommended above, also fork out the money and get a crank while your at it and the engine is apart. For the added cost forget a sump baffle kit and go for a sump extension.

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