Hello,
Does anyone know what the tensile strength is on a stock S4 rod bolt.
Thanks,

 

Its not very high Joe. On two separate engines I built, on a few rods each engine, they did not survive 3 or so re torques as I was testing the big ends for clearance.

They "stretched" at a few pounds before the WSM number.

I actually think they are close to one-time use bolts. No one here will probably agree with me, because everyone wants to think you can go back in there every race season, put new rod bearings in and retorque the bolts and "put new nuts on" but this is unfortunately not correct.

ARP rod bolts are pretty easy to get and not too pricey. They are much more robust and come with cooler nuts.

 

Brendan
Thanks -- but what I'm after is the strength in lb's , WMC bolts are 220k & the CARR bolts are 285k
I'm looking for the rating on the S4 bolt but don't know where to find it ...

 

Thought I'd ask again now that some of you are home from work and
missed it , Thanks

 

Just look for the 944 bolt set for the con rods ,2 sets required , should cost about $150 per set , from the ARP website