Jump to content
SAU Community

RB26 Conrods - Failure Limit?

BoOsTeD_RB26
 Share

Recommended Posts

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

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • joshuaho96
      R34 25GT Engine Light 21

      By joshuaho96 · Posted

      Oil change does not trigger code 21. Code 21 is for coilpacks primary side connection. You can try to clear the code with a battery disconnect, hold down the brake pedal to drain capacitors through the brake lights with the ignition on for 10-15 seconds before you reconnect the battery. I have seen R35 coil conversion permanently cause this code with no ill effects so it might be the resistance it wants to see isn't quite right on one or more coilpacks. Could be inside the ECU, could be the harness, could be a coil. You can test it all if you want or just ignore until the car actually starts misfiring.
    • joshuaho96
      R32 GTS (RB20DE) Injectors Replacement

      By joshuaho96 · Posted

      I forgot you have a Nistune ECU. Use Nistune to do all the tests I mentioned instead of faffing with 30+ year old electrical connectors. You can read MAF volts off that too, there are reference values in the service manual to tell you roughly what it should be in different conditions.
    • GTSBoy
      R32 GTS (RB20DE) Injectors Replacement

      By GTSBoy · Posted

      No. I think it might be the AFM. Hence the use of the terms "swaptronics", which implies the use of swapping out electronics for the purpose of diagnosis. It's about the only way to prove that a small/niggling/whatever problem with an AFM or a CAS or similar is actually caused by that AFM/CAS/whatever. A known good item swapped in that still gives the same problem is likely to be caused somewhere else. They're all the same. Spraying AFMs with cleaner is an each way bet between cleaning it and f**king it.
    • codygrimm27
      Can you mount the ATTESA pump in other locations?

      By codygrimm27 · Posted

      Oh wow! This might actually work amazingly. Do you know the ratio of the diff? I was told the only thing you need to make sure of is if the front & rear diff ratios are the same. Ours is a 4.083 Thanks!
    • GabsReDeal
      R32 GTS (RB20DE) Injectors Replacement

      By GabsReDeal · Posted

      You think its the AFM? I know its a common issues on R32s. I find it coincidental how this issue raised right after cleaning the fuel system. As everything except the fuel system was fine before. I tried running it with the IACV unplugged but did not notice a difference and still stalled. However, the RPM gauge is not in the cluster right now, so I will need to connect the laptop again and use Nistune to check the RPM. I will check this weekend.
×
×
  • Create New...