Stroking A Rb25

[muchogarcia34]

Hey all,

First time posting here have been around and to a few shoots but thats about it. So anyway cut to the chase, I want to look into stroking my rb25 to a rb27. What is needed to do this, I've heard from a couple of sources you can use rb26 gear to do it but I'm not sure. Even if I can be pointed in the direction to a another post if this has been discussed before that would be awesome.

[N I B]

RB26 Parts fit into RB25s. That easy exept NEO engines need compression ratio dropped back to around 9-1.

[R31Nismoid]

Why do you want to stroke it?

What is the current setup?

What is the use of the car?

What is the budget?

[BOZ22N]

I have also been looking into this for a while and I am keen to hear peoples experiences.

Adz is running a 2.8 set up in his Rb25 block I think it is a response monster.

I am also keen to get the con rod lengths of both the RB25 and the RB26 engines so I can look at the different rod ratios.

[DaGr81]

A sauwa president (or member of some sort) has a rb27 he used 88mm/87mm pistons and rb26 rods and crank (I think that was it) maybe nismoid might remember better

[N I B]

25 and 26 have the same size rod tho 26 rod is stronger. As I said above just use RB26 Crank, Rods and Pistons in the 25 Block, Pre NEOs need no extra work.

NEOs have smaller combustion chambers so you need your Machine shop to check comp ratio and machine Piston domes to drop comp ratio back to around 9 to 1. RB26 Stroker kits can be used in 25s by doing the same.

[BOZ22N]

25 and 26 have the same size rod tho 26 rod is stronger. As I said above just use RB26 Crank, Rods and Pistons in the 25 Block, Pre NEOs need no extra work.

NEOs have smaller combustion chambers so you need your Machine shop to check comp ratio and machine Piston domes to drop comp ratio back to around 9 to 1. RB26 Stroker kits can be used in 25s by doing the same.

Do you know the rod length of them then?

Also do you know the CC's of both the 25 and 26 heads? so i can start working out comp ratios etc.

Thanks for the help.

[Mr. Untouchable]

I'm going to use a 26 crank and 26 spec rods and pistons.

a new 33 gtr crank comes in at around $1000-1100 and the bonus is its ready for a 26 spec oil pump.

the 2.8 rb25 people are reffering to is a 33 in W.A. I think his name is paul cornes or something, thats a rb25, 26 crank, pauter rods and mahle pistons (i think) and runs a 88mm bore. built by XSpeed (i think)

I think running a 26 crank is a great idea but boring it out so far just to gain some extra cc's seems a bit crazy. i think id rather have a bit more meat in the block. but hey i'm no engine builder! =)