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RB26 Conrods - Failure Limit?

BoOsTeD_RB26
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Gav Mentor

Gav

Posted
Posted
Just curious to see if anyone can shed some light on when standard RB26 Conrods are likely to fail. Bearing in mind that the standard rev limit is still used.  

I've searched for it but can't seem to find any answers.

Cheers

The statement is somewhat self defeating in that in general big power comes at high revs with the RB26.

I would also suspect that high revs probably contributes the the breakage of rods as much as the torque stresses.

Anyway, as a guess, I would say if you select the rods carefully and prepare/check thoroughly (crack test, shot pean, linish), I would suggest that you would be safe for any low mount application.

For twin high mounts/big single, you would be pushing your luck over time.

wreckedhead Mentor

wreckedhead

Posted
Posted

ive been driving my car and giving it a beating every time i drive, and i got standard interenals and never had a problem, rb36 motors in general are very strong, i got mine tuned on 386kw@ all wheels and cant see anything failing unless i intentionally want to break something.

Merli Grand Master

Merli

Posted
Posted

I think the general consensus is 600hp is a SAFE limit to impose on rods, and 800hp for the crank.

They will hold a little more than 600hp, but they'll be living on borrowed time.

Clint32 Mentor

Clint32

Posted
Posted

yeah 600hp will never be a problem especially with arp bolts, but any you never know, you can get new rods for 1500 now so why bother, by the time you prep the rods and put new bolts in them, compared to selling you std ones and getting new ones you will be about $500 worse off, so if your building the engine do the rods

MattSR Community Regular

MattSR

Posted
Posted
Just curious to see if anyone can shed some light on when standard RB26 Conrods are likely to fail. Bearing in mind that the standard rev limit is still used.  

I've searched for it but can't seem to find any answers.

Cheers

Any engineer worth his salt will tell you that conrods fail on the overlap part of the cycle at top dead centre - nearly always

Cheers,

Matt

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