Who has broken a stock rod with ARP bolts?
09-07-2003, 07:59 PM
#1
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Who has broken a stock rod with ARP bolts? Who has broken a stock rod and what were the circumstances? Did you have ARP rod bolts? I'm wondering how far I could push a shortblock with stock rods/crank and forged pistons.
09-07-2003, 11:01 PM
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Re: Who has broken a stock rod with ARP bolts?
Is this true. Someone ran 9.90's with stock rods and ARP Rod bolts? How much nitrous?
"Just a bit of info.
I am running a JE piston, stock crank and STOCK RODS!
I wish to heck that I put in a forged rod now, but
I firmly belived that I could consistantly put 550rwhp
on the stock rods if they were worked and if I could
keep the knock out of the motor.
So far my faith in the stock rod has come through.
Almost everyone said, a stock rod wouldn't last into
the low-10's. I wanted to find out(and save some
money) in this build-up.
When I put the motor together, I had a machine
shop resize and stress relieve the stock rods.
The rods were in my last motor(heads/cam/nitrous)
and they had 36k miles before I pulled that one
apart and re-used the rods in the current motor.
Stock rods ran 9.81!
Jay Johnson"
09-07-2003, 11:04 PM
#6
Re: Who has broken a stock rod with ARP bolts? I dunno, but 2001's and up are supposed to have stronger rod bolts right from the factory, although I doubt as strong as ARP's. I've heard on this board several times that going above 6700 rpm with a pre-2001 low end is walking on thin ice. So with your 2001 and ARP rod bolts you should be good for close to 7000 rpm.
09-07-2003, 11:10 PM
#7
Re: Who has broken a stock rod with ARP bolts?
Is this true. Someone ran 9.90's with stock rods and ARP Rod bolts? How much nitrous?
"Just a bit of info.
I am running a JE piston, stock crank and STOCK RODS!
I wish to heck that I put in a forged rod now, but
I firmly belived that I could consistantly put 550rwhp
on the stock rods if they were worked and if I could
keep the knock out of the motor.
So far my faith in the stock rod has come through.
Almost everyone said, a stock rod wouldn't last into
the low-10's. I wanted to find out(and save some
money) in this build-up.
When I put the motor together, I had a machine
shop resize and stress relieve the stock rods.
The rods were in my last motor(heads/cam/nitrous)
and they had 36k miles before I pulled that one
apart and re-used the rods in the current motor.
Stock rods ran 9.81!
Jay Johnson"
Wow!!!! I guess he kept the rpm's down.. Any idea on how high he was shifting? This is really important.,.
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09-08-2003, 10:42 AM
#11
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Re: Who has broken a stock rod with ARP bolts? fellas, Jay has a full race setup, w/ a glide, and alot of weight reduction. im sure you can pull this off, but the rods are going to let go. from what understand this was a 175 shot, but not more than that. i'd be VERY leery about doing this, especially if you were just trying to save a buck. but to each his own,
so what happens when you cant keep the knock out? 
i've pulled apart countless warranty motors from the dealership, and i cant tell you guys how many stock rods from these gen III engines i've seen snapped in half. broken right off above the big end of the rod. i.e. NOT a rod bolt failure. and this was on a STOCK un-modified motor experiencing detonation.
I wish to heck that I put in a forged rod now, but I firmly belived that I could consistantly put 550rwhp on the stock rods if they were worked and if I could keep the knock out of the motor.
i've pulled apart countless warranty motors from the dealership, and i cant tell you guys how many stock rods from these gen III engines i've seen snapped in half. broken right off above the big end of the rod. i.e. NOT a rod bolt failure. and this was on a STOCK un-modified motor experiencing detonation.
09-08-2003, 03:47 PM
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Re: Who has broken a stock rod with ARP bolts? I'm no kind of expert, but from what I've read
con rods fail in tension, not compression, and
this is RPM and rotating mass more than
HP/TQ/cylinder pressure.
Now, bent rod would be downstroke, power related.
Speed shop I used to go to had a collection of
bent aluminums from their nitro rail.
I can't see a powdered metal rod being as good
in tension as a forged steel or even ductile iron
one.
con rods fail in tension, not compression, and
this is RPM and rotating mass more than
HP/TQ/cylinder pressure.
Now, bent rod would be downstroke, power related.
Speed shop I used to go to had a collection of
bent aluminums from their nitro rail.
I can't see a powdered metal rod being as good
in tension as a forged steel or even ductile iron
one.
09-08-2003, 06:28 PM
#13
Re: Who has broken a stock rod with ARP bolts? I "WAS" going to use stock rods w/ ARP bolts in my next motor (if I did a 388) but after I talked to different people and found that I could get Eagle forged SBC rods w/ ARP bolts for ~$450 from Summit, Jegs, and others.....its just not worth the risk.....
I will put $5K in a motor....then have to start over because I wouldn't pay $500 for new rods (stocks went...)...thats not cool...
I will put $5K in a motor....then have to start over because I wouldn't pay $500 for new rods (stocks went...)...thats not cool...
09-08-2003, 07:49 PM
#14
Re: Who has broken a stock rod with ARP bolts?
I'm no kind of expert, but from what I've read
con rods fail in tension, not compression, and
this is RPM and rotating mass more than
HP/TQ/cylinder pressure.
con rods fail in tension, not compression, and
this is RPM and rotating mass more than
HP/TQ/cylinder pressure.
