Power Limit of RB26 Rods?

[Sneezer]

Does anyone know what the maximum power limit of a standard RB26DET con rod is? At what point do they stretch/bend?

I have been offered a set to put into my RB25DET engine as an upgrade. So I need to know whether it's worth it.

Also you guys talk about Linished rods. Can someone explain what that is please?

Cheers Fellas

[Clint32]

gtr and rb25 rods are the same in most engines, there is talk that there is a weaker rb25 rod but you will not know if they are still in the engine

[R32-GTS]

I am told by relable sources and have seen GTR's make 450rwhp + on standard rb26 rods.

I am currently building a rb26 and not sure yet whether to upgrade the rods or not. I think it would be more for security. And with the forged rod been lighter it should revv a bit more freely as well.

[hungry6]

I can say from a hands on experience that rb26 and rb25 rods are world apart. they have different shape beam the egdes are different also thicker and the most important of all is that the rb26 rod carry a masive bearing end as comparo to an rb25. As for power capacity is all depends on how well u tuned it. But big numbers have been recorded.

[Merli]

gtr and rb25 rods are the same in most engines

Just wondering where you got this tidbit of information from, or what evidence you have to support this? :whatsthat

[Steve]

Merli, one place that comes to mind is http://www.skylinesaustralia.com/forums/sh...ead.php?t=28130

Steve-SST, who has played with many RB25s and RB26s, is quite adamant that they are the same in most cases, just some RB25s came out with weaker rods, but it appears from his posts that most had the same rods as RB26.

[Merli]

Very interesting read!

I suppose it's quite possible, as all RB25 failures I've seen from excessive power levels have been piston related, which THEN leads to the rods punching holes through the block.

I'm not so sure about the claim that "but some RB 25s have weaker rods but a lot have GTR rods" though... That just seems very iffy and unlikely to me.

Either they all have the same rods or don't. Or all Series 2 and on have RB26-spec rods, or something like that. The claim of:

The only real way is to pull it down but some RBs respond very well to boost upgrades-Exhausts etc and some don't, the ones that don't tend to be the dog motor as the head flows less.

seems like it's based on not enough evidence to me, and based on one or two RB25s grenading and resulting opinion that it had "weaker rods than the rest" and was a "dog motor"

But I suppose Steve-SST has seen a lot more RB25s than I have, so

[maximajim]

Can someone post some large pics of the RB26 rods? I can post pics of the rb25 rods for comparsion (They are polished though)

[DoughBoy]

RB26 rod!

[maximajim]

Ok now

Looking for a factory rb26 rod

[DoughBoy]

Oh OK!

[R32-GTS]

I will try and get a digi pic of my stock rb26 rod tomorrow.

[maximajim]

Oh OK!

Ha that's a better pic! :headspin:

[DoughBoy]

OMG you violated my personal web area! I feel so used.

[maximajim]

OMG you violated my personal web area! I feel so used.

Haha I'm sorry!

What kind of rod is that?

This is a pic of my rb25 rod with ross piston.

http://rb25det.org/RB/DCP_0559.JPG

[Merli]

They have different markings cast onto them and the big end part seems to look different in one part too...

[maximajim]

They have different markings cast onto them and the big end part seems to look different in one part too...

The beam section is most striking to me. It looks to be much much stronger. That is not good . I was hoping the RB25 rods were the same.

[MattyB]

it could be me, but they seem to look different lenghts. anyone else notice this or am i cing things?

[maximajim]

it could be me, but they seem to look different lenghts. anyone else notice this or am i cing things?

The thicker beam section of the other rod imo, makes it look that way.

[maximajim]

Need to verify that is a rb26 rod however.