RB26/30 in 32GTR

[manage13]

Hi everyone!

Just need some help from all the tech heads out there.

I have recently had my RB26 block sonic tested and I have been informed that the walls of the block are too thin. They recommend me purchase another standard block. However I have a RB30 block and I am interested in using this instead.

I heard it’s a bit of a headache trying to put the RB26 head / RB30 block set up into a R32 GTR. Is this true? Can someone explain the necessary modifications involved in this set up.

Thanks.

[jas/slo32]

Hi everyone!

Just need some help from all the tech heads out there.

I have recently had my RB26 block sonic tested and I have been informed that the walls of the block are too thin. They recommend me purchase another standard block. However I have a RB30 block and I am interested in using this instead.

I heard it’s a bit of a headache trying to put the RB26 head / RB30 block set up into a R32 GTR. Is this true? Can someone explain the necessary modifications involved in this set up.  

Thanks.

the rb26head is a straight bolt on to the rb30 bottom end all you have to do is put another timing tensioner on the rb30 bottom end. if you didnt want to do it yourself sub-zero have done 100s of them(55717077)

[Dahtone Racing]

im pretty sure you will also need larger head studs

[wreckedhead]

and also the rb30 block sits higher then the rb26 block so engine mounts have to be modified

[Dash]

Your sumps the main problem as you have a drive shaft running through it

Heaps of info here

http://www.skylinesaustralia.com/forums/sh...970#post1185970

[manage13]

Thaks heaps for the info guys. My main concern is if rb26/30 will fit in a R32 GTR. Also what modifications must the sump go through?

[Morgs]

Its a tough ask reading through all the pages of that prior post for the quick answers

I've heard you need a custom sump and a few bits and pieces to get it fit. Might also need new bonnet so the height is ok.

[ylwgtr2]

ok...the problem is the RB30 block is not wide enough for the RB26 sump...therefore you need to make an adapter plate up....But the diff will then be a little lower also the sump to gearbox bolts dont line up and the driveshaft from the transfer case has a diffrent angle running to the front diff so the recess that is cast into the bell housing may be an issue

[pnblight]

Hi everyone!

Just need some help from all the tech heads out there.

I have recently had my RB26 block sonic tested and I have been informed that the walls of the block are too thin. They recommend me purchase another standard block. However I have a RB30 block and I am interested in using this instead.

I heard it’s a bit of a headache trying to put the RB26 head / RB30 block set up into a R32 GTR. Is this true? Can someone explain the necessary modifications involved in this set up.  

Thanks.

Your best bet it to get your rb26 block fully sleeved around $700 to get back to std bore size (ready to bolt new pistons in) and the sleeve material is twice as strong as the block material for the same wall thinkness . Not hard to do and is good for 1000hp plus if dont properly (os giken 3 litre is sleeved rb26 block with a large spacer basically)

my mates run a sleeved block in his r32 gtr now and i did alot of engines like this when i was in the industry

[DAN00H]

Your best bet it to get your rb26 block fully sleeved around $700 to get back to std bore size (ready to bolt new pistons in) and the sleeve material is twice as strong as the block material for the same wall thinkness . Not hard to do and is good for 1000hp plus if dont properly (os giken 3 litre is sleeved rb26 block with a large spacer basically)

my mates run a sleeved block in his r32 gtr now and i did alot of engines like this when i was in the industry

Agreed, better than the RB30 route! that is what I'd do if in your situation.

[manage13]

Hi everyone!

Thanks for all your replies.

I took pnblights advice and I spoke to the engine builder about it. He said for me to re-sleeve it will cost about $130 a bore, so for 6 be $780. For that sort of price I might as well look for another standard block.

Now this is what I can’t understand. Previously my block was bored out to fit 87.5mm pistons and I have access to 88mm pistons. He said if he bored to fit these pistons the wall will be too thin. But on many occasions I have seen HKS 88mm pistons on various GTR’s. One such example is Deans (Ultimate Performance Imports) R33 GTR. So why is my block an exception? I realize that all blocks are different but can this be done?

[DAN00H]

he may have discovered a thin spot, or air bubble in your block. did he x-ray it? what testing was done? you don't want to go too close to the water jacket - best to keep the thickness if you can.

[pnblight]

Hi everyone!

Thanks for all your replies.  

I took pnblights advice and I spoke to the engine builder about it. He said for me to re-sleeve it will cost about $130 a bore, so for 6 be $780. For that sort of price I might as well look for another standard block.  

Now this is what I can’t understand. Previously my block was bored out to fit 87.5mm pistons and I have access to 88mm pistons. He said if he bored to fit these pistons the wall will be too thin. But on many occasions I have seen HKS 88mm pistons on various GTR’s. One such example is Deans (Ultimate Performance Imports) R33 GTR. So why is my block an exception? I realize that all blocks are different but can this be done?

the only other thing i would take into consideration is even if you get another block you will still have to bore and hone it so the cost will be more than just another block and you might be any better off

sleeved block $780 as your quote

(this block will have good strength and can be rebored down the road etc)

new block $1200-1500(i'm guessing) plus boring and honing $~400

you will be looking at twice the cost at a guess and the block will not be as strong

just my opinion

cheers

[Fitzpatrick Speed Works]

if you do a search for my name you will find a whole heap of info on the rb26/30, i also sell the adaptor plate and there is a far bit of work involved but if you are interested PM and i can tell you how my adapter plate works!!!

[manage13]

the only other thing i would take into consideration is even if you get another block you will still have to bore and hone it so the cost will be more than just another block and you might be any better off

sleeved block $780 as your quote

(this block will have good strength and can be rebored down the road etc)

new block $1200-1500(i'm guessing) plus boring and honing $~400

you will be looking at twice the cost at a guess and the block will not be as strong  

just my opinion

cheers

YEA pnblight, you talked some sense into me. Ill call my engine builder tomorrow. I hope his workmanship at sleeving is good.

Thanks for your advice