Re: Super Cobra Jet Connecting Rods

rmcomprandy August 16th 2012, 10:05 am

There are some pretty good forged 4340 I-beam rods in the marketplace, also.
However, the length availability is limited.

1faststang August 16th 2012, 10:18 am

kjett wrote:
dfree383 wrote:
slurm wrote:does a polished and shot peened stock rod have a greater longevity?

Yes it does Help.

Makes it look purdy.

if you are going to spend the money to try to make a stock rod better, just put that towards the H-beam rods. Cost vs. return will be much better in the end. I was looking to go the same route as you at one point, so glad the same people recommending the H-beams here are the same people telling you to do the same. Just sayin...

dirt_worker August 17th 2012, 12:18 pm

My dad lost a scj rod in his mud truck several years ago. He was spraying a 200 shot before it let go. I tend to believe the heavy trw pistons and high rpm is what killed it. Btw....the beams were polished and shotpeened.

for me saving $300-400 isn't worth risking unnecessary damage to an expensive engine.

cletus66 August 17th 2012, 1:57 pm

IDT-572 wrote:RPM is the killer of stock rods, as rpm increases the rod egg shapes and pinches at the parting lines, then the oil is scraped or wiped off the pin and the problem starts.

Race bearings have more clearance at the parting lines, but stock rods at high rpm and heavy pistons it is still not enough.

If you know what you are doing you can get away with it. But for the normal bracket guy the H beams are a cheap insurance factor.

H beams and a stock crank and light pistons are dang near bullet proof.

JMHO

I remember Jon Kaase posting that there is a way to machine the big end to "help" prevent this. The difference is that he can do it for free, and somebody else would have to pay him. Then add in the age and cycles, and it just makes sense to buy some new ones.

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