Super Cobra Jet Connecting Rods

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Super Cobra Jet Connecting Rods

Post  1faststang on August 15th 2012, 8:11 am

Super Cobra Jet Connecting Rods.. anyone using these??.. Thoughts/Opinions??
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Re: Super Cobra Jet Connecting Rods

Post  dfree383 on August 15th 2012, 8:15 am

Spend the money on some SCAT Hbeams.

The Factory rods tend to break in the middle of the beam. But are OK if you keep the RPM down and use Lighter Pistons.

PS SCJ rods are no different than Truck, CJ or Marine Rods.

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Re: Super Cobra Jet Connecting Rods

Post  1faststang on August 15th 2012, 8:22 am

dfree383 wrote:Spend the money on some SCAT Hbeams.

The Factory rods tend to break in the middle of the beam. But are OK if you keep the RPM down and use Lighter Pistons.

PS SCJ rods are no different than Truck, CJ or Marine Rods.


Thanks for the info!
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Re: Super Cobra Jet Connecting Rods

Post  BOSS 429 on August 15th 2012, 10:20 am

dfree383 wrote:Spend the money on some SCAT Hbeams.

The Factory rods tend to break in the middle of the beam. But are OK if you keep the RPM down and use Lighter Pistons.

PS SCJ rods are no different than Truck, CJ or Marine Rods.

------------------------------------------------------------------------
really?
I''m still waiting to see a pic of one broke in the middle?


we run the truck/cj rods 7200 to 7500 rpm ,no problems, and many many times with nos 300 kits,and higher

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Re: Super Cobra Jet Connecting Rods

Post  dfree383 on August 15th 2012, 10:27 am

BOSS 429 wrote:
dfree383 wrote:Spend the money on some SCAT Hbeams.

The Factory rods tend to break in the middle of the beam. But are OK if you keep the RPM down and use Lighter Pistons.

PS SCJ rods are no different than Truck, CJ or Marine Rods.

------------------------------------------------------------------------
really?
I''m still waiting to see a pic of one broke in the middle?


we run the truck/cj rods 7200 to 7500 rpm ,no problems, and many many times with nos 300 kits,and higher


I don't have any pics but I have seen a few broken over the years..... I've run them in the past too.

But with the avalibility of decent aftermarket Hbeam at great prices, it makes reconditioning and working of the factory stuff rather impratical unless you can do it yourself for free.

Also keep in mind the number of cycles on the old factory stuff that in some cases over 40 years old now.
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Re: Super Cobra Jet Connecting Rods

Post  1faststang on August 15th 2012, 10:30 am

BOSS 429 wrote:
dfree383 wrote:Spend the money on some SCAT Hbeams.

The Factory rods tend to break in the middle of the beam. But are OK if you keep the RPM down and use Lighter Pistons.

PS SCJ rods are no different than Truck, CJ or Marine Rods.

------------------------------------------------------------------------
really?
I''m still waiting to see a pic of one broke in the middle?


we run the truck/cj rods 7200 to 7500 rpm ,no problems, and many many times with nos 300 kits,and higher



Wow!!.. the only reason I'm asking is that I can get a good deal on a set. I was thinking of going with a set of H Beams.. but if the Super Cobras are just as good.. why bother right??.
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Re: Super Cobra Jet Connecting Rods

Post  dfree383 on August 15th 2012, 10:35 am

1faststang wrote:
BOSS 429 wrote:
dfree383 wrote:Spend the money on some SCAT Hbeams.

The Factory rods tend to break in the middle of the beam. But are OK if you keep the RPM down and use Lighter Pistons.

PS SCJ rods are no different than Truck, CJ or Marine Rods.

------------------------------------------------------------------------
really?
I''m still waiting to see a pic of one broke in the middle?


we run the truck/cj rods 7200 to 7500 rpm ,no problems, and many many times with nos 300 kits,and higher



Wow!!.. the only reason I'm asking is that I can get a good deal on a set. I was thinking of going with a set of H Beams.. but if the Super Cobras are just as good.. why bother right??.
they are not just as good......
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Re: Super Cobra Jet Connecting Rods

Post  1faststang on August 15th 2012, 10:39 am

dfree383 wrote:
1faststang wrote:
BOSS 429 wrote:
dfree383 wrote:Spend the money on some SCAT Hbeams.

The Factory rods tend to break in the middle of the beam. But are OK if you keep the RPM down and use Lighter Pistons.

PS SCJ rods are no different than Truck, CJ or Marine Rods.

------------------------------------------------------------------------
really?
I''m still waiting to see a pic of one broke in the middle?


we run the truck/cj rods 7200 to 7500 rpm ,no problems, and many many times with nos 300 kits,and higher



Wow!!.. the only reason I'm asking is that I can get a good deal on a set. I was thinking of going with a set of H Beams.. but if the Super Cobras are just as good.. why bother right??.
they are not just as good......


Thats what I wanted to know.. Thanks!
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Re: Super Cobra Jet Connecting Rods

Post  1faststang on August 15th 2012, 10:47 am

I'll open up another can of worms.. what are the stock 460 Cranks like??.
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Re: Super Cobra Jet Connecting Rods

Post  56Tbird on August 15th 2012, 11:25 am

I've broke a SCJ rod about 1 1/2" below the pin before @ 6500 RPM...Tears up alot of stuff when it happens.Put some decent rods in it. The stock cranks are tough as hell!!
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Re: Super Cobra Jet Connecting Rods

Post  1faststang on August 15th 2012, 11:28 am

56Tbird wrote:I've broke a SCJ rod about 1 1/2" below the pin before @ 6500 RPM...Tears up alot of stuff when it happens.Put some decent rods in it. The stock cranks are tough as hell!!

Good to know.. the main reason I ask is because my 501 crank cracked.. it was supposed to be 4340.. but looks like it was cast. Just wanted to know how strong the "stock" 460 was. Thanks!!
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Re: Super Cobra Jet Connecting Rods

Post  BOSS 429 on August 15th 2012, 11:45 am

Im not tryin to say just as good as aftermarket h beams, just saying their not as bad as people say they are,

WE still have never broke one ,with 12.to 1 and spaying them. we dont run them past 12.1

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Re: Super Cobra Jet Connecting Rods

Post  1faststang on August 15th 2012, 11:54 am

BOSS 429 wrote:Im not tryin to say just as good as aftermarket h beams, just saying their not as bad as people say they are,

WE still have never broke one ,with 12.to 1 and spaying them. we dont run them past 12.1


Thanks for the info!
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Re: Super Cobra Jet Connecting Rods

Post  IDT-572 on August 15th 2012, 12:03 pm

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
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Re: Super Cobra Jet Connecting Rods

Post  Lem Evans on August 15th 2012, 12:09 pm

I've had them break.......it was later rather than sooner...3rd season...broke in the beam.

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Re: Super Cobra Jet Connecting Rods

Post  1faststang on August 15th 2012, 12:13 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

Thanks!!
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Re: Super Cobra Jet Connecting Rods

Post  rmcomprandy on August 15th 2012, 12:53 pm

BOSS 429 wrote:
dfree383 wrote:Spend the money on some SCAT Hbeams.

The Factory rods tend to break in the middle of the beam. But are OK if you keep the RPM down and use Lighter Pistons.

PS SCJ rods are no different than Truck, CJ or Marine Rods.

------------------------------------------------------------------------
really?
I''m still waiting to see a pic of one broke in the middle?


we run the truck/cj rods 7200 to 7500 rpm ,no problems, and many many times with nos 300 kits,and higher


Several early Ford Racing big block crate motors came back with a rod beam broken just under the small end. THAT is the main reason FRPP crate motors switched to a different rod.

Let's just say they are not as forgiving when the tune is wrong or they get over-reved.

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Re: Super Cobra Jet Connecting Rods

Post  1faststang on August 15th 2012, 12:59 pm

rmcomprandy wrote:
BOSS 429 wrote:
dfree383 wrote:Spend the money on some SCAT Hbeams.

The Factory rods tend to break in the middle of the beam. But are OK if you keep the RPM down and use Lighter Pistons.

PS SCJ rods are no different than Truck, CJ or Marine Rods.

------------------------------------------------------------------------
really?
I''m still waiting to see a pic of one broke in the middle?


we run the truck/cj rods 7200 to 7500 rpm ,no problems, and many many times with nos 300 kits,and higher


Several early Ford Racing big block crate motors came back with a rod beam broken just under the small end. THAT is the main reason FRPP crate motors switched to a different rod.

Let's just say they are not as forgiving when the tune is wrong or they get over-reved.

Good Info!! Thanks
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Re: Super Cobra Jet Connecting Rods

Post  bbf-falcon on August 15th 2012, 2:28 pm

I feel the same as Dave,w/the price of a Scat/Eagle H-beam,why chance it. Shocked

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Re: Super Cobra Jet Connecting Rods

Post  1faststang on August 15th 2012, 2:36 pm

bbf-falcon wrote:I feel the same as Dave,w/the price of a Scat/Eagle H-beam,why chance it. Shocked

I hear yah's.. looks like Scat/Eagle H Beams!
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Re: Super Cobra Jet Connecting Rods

Post  slurm on August 15th 2012, 8:57 pm

does a polished and shot peened stock rod have a greater longevity?
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Re: Super Cobra Jet Connecting Rods

Post  kim on August 15th 2012, 9:48 pm

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

No, anything stock, made as inexpensive as possible.

Shot peening and or polishing stock components removes sharp edges, where stress risers can form, but it isn't going to change the metalurgy of the part. If there is a casting flaw or weekness, its still there. Forged, billlet, etc........... money buys inspected quality,

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Re: Super Cobra Jet Connecting Rods

Post  dfree383 on August 16th 2012, 1:36 am

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

Yes it does Help.
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Re: Super Cobra Jet Connecting Rods

Post  kjett on August 16th 2012, 9:08 am

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

Yes it does Help.

Makes it look purdy. Very Happy

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...
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Re: Super Cobra Jet Connecting Rods

Post  IDT-572 on August 16th 2012, 9:20 am

There is no doubt the after market h and I beams are better. He asked if it would help longevity, and the answer is yes..............

If you had a class where you had to run stock oem rods, you would and could help the HP capability of them by beam polishing and shoot peening. By how much? I'm not sure, I have seen them broken too.

But it does relieve stress risers and helps a crack from starting.
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