Rb25/26

[tommyb]

hi guys just wondering iam wanting to rebuild my rb25 just wondering if this will work and what will need to be done to the block.

i want to use rb26 crank to stroke it

then do i need to use 26 pistons and rods or can i use 25 ones

thanks for any help

iam wanting to run a to4z turbo

i was think of using jun internals

[Adriano]

Use the rb26 crank and aftermarket 26 rods and forged pistons, should be strong enough for a to4z with plenty of boost, just make sure you have all the other supporting bits, valve springs, injectors, computer and possibly cams

[R31Nismoid]

Whats your budget dude?

If you use the RB26 crank, rods i think the RB25 pistons.

Someone will confirm as a lot have done it.

I just used the RB25 crank/26 rod/25 piston

[tommyb]

Whats your budget dude?

If you use the RB26 crank, rods i think the RB25 pistons.

Someone will confirm as a lot have done it.

I just used the RB25 crank/26 rod/25 piston

it is going into a stagea so i want about 300kw

so i can just use a forged 26 crank rods and pistons

what the deck height will the pistons go to high

[R31Nismoid]

You dont need a t04z for 300rwkw mate.

Total overkill

A GT30 will pretty much get you there.

[tommyb]

You dont need a t04z for 300rwkw mate.

Total overkill

A GT30 will pretty much get you there.

yer true just want the motor to hold for a while u know

that or a 30/40

do u think it would be a hard rebuild

[R31Nismoid]

Putting on a larger than needed turbo wont help the motor last longer than something else

It'll set you back aroun 5 figures once you get everything together.

[BHDave]

26 rods and crank and pistons will do it. Same deck height and rod length remember.

25 pistons on 26 rod and crank would be sitting proud of the block at TDC

[tommyb]

26 rods and crank and pistons will do it. Same deck height and rod length remember.

25 pistons on 26 rod and crank would be sitting proud of the block at TDC

so BD Dave i can just 26 crank and rods and pistons and i wont have to do anything to the block or

[Stronzo]

26 crank has longer stroke, rods are equal (in size, but 26`s are stronger), pistons are different. block height is the same, head cc is almoust th same (25 a bit smaller)

26 or aftermarket rods is a must as 25 rods are weak.

26 crank + 25 pistons will have CR too high or what BHDave said.

The best option is 26 crank+rods+pistons in 25 block. i do the same thing for myself now.

[BHDave]

You have to check that there's sufficient clearance in the block for the longer throw crank and the big ends of the rods, so maybe a bit of machining there (some one will have to confirm as i haven't dummied one up to check). As you'd probably put in new pistons anyway it's just a matter of machining the bore to suit the new pistons (assuming .5 oversize).

[N I B]

26 pistons,crank and rods are all needed and everything clears without trouble.Just did one and as Ash said dont use the T04Z for that power as all you will get is lag.