Rb25/34

[MRHD66]

I've read on the spool site 2 different stroke sizes for the RB34 so what is it 94mm or 95mm I'm confused

Edited November 8, 2012 by MRHD66

[brenton21]

I've read on the spool site 2 different stroke sizes for the RB34 so what is it 94mm or 95mm I'm confused

Maybe the earlier cranks were 95mm and the newer versions (full counterweight) are 94mm. Maybe to reduce the amount of clearancing required on the girdle.

[r33_racer]

That is correct. It was reduced to 94mm for clearancing issues. Alot of people were scared about having to take to their block with a die grinder to remove material.

[MRHD66]

That is correct. It was reduced to 94mm for clearancing issues. Alot of people were scared about having to take to their block with a die grinder to remove material.

cool as but now it should be called a RB33 as its closer to 3.3l then 3.4l

[r33_racer]

My one works out to be 3352.8cc. With a 87mm bore though.

Depends on bore size really.

[MRHD66]

My one works out to be 3352.8cc. With a 87mm bore though.

Depends on bore size really.

so u got the 94mm stroke one then

[r33_racer]

yep. I didn't think he still had the 95mm ones?

[MRHD66]

That sux

Edited November 9, 2012 by MRHD66

[MRHD66]

yep. I didn't think he still had the 95mm ones?

me either even tho that would be the one I'd really want did u use a standard cradle I'm thinking of using a spool cradle and main caps Edited November 9, 2012 by MRHD66

[brenton21]

My one works out to be 3352.8cc. With a 87mm bore though.

Depends on bore size really.

Was gunna say, if it's 40thou over (3.46 bore x 3.70 stroke) = 208.74 ci which = 3,421.17 cc or 3.4 Lt

me either even tho that would be the one I'd really want did u use a standard cradle I'm thinking of using a spool cradle and main caps

What power level are you chasing? I've read the standard caps and girdle are good for 1000 hp. I'm getting a rb34 short block from spool with the standard girdle. I'm chasing 800 ish

Edited November 9, 2012 by brenton21

[MRHD66]

Was gunna say, if it's 40thou over (3.46 bore x 3.70 stroke) = 208.74 ci which = 3,421.17 cc or 3.4 Lt

What power level are you chasing? I've read the standard caps and girdle are good for 1000 hp. I'm getting a rb34 short block from spool with the standard girdle. I'm chasing 800 ish

sweet good to know

[brenton21]

Was gunna say, if it's 40thou over (3.46 bore x 3.70 stroke) = 208.74 ci which = 3,421.17 cc or 3.4 Lt

My bad. Just realised l worked that out as a 88mm bore. not 87mm. sorry