Who has actually bent /broke aftermarket rods?
10-08-2009, 06:47 PM
#1
Who has actually bent /broke aftermarket rods? I am not sure really what connecting rods were used in my 408. They are callies but engine builder is deceased now. I now see that callies has like four types in new high tech perf .I did tell builder what hp wanted to make around 1000rwhp occasionally but most likley around 800rwhp most of the time.
So now worried a bit. So are the ratings not really set in stone and who has bent /broke aftermarket rods and if so what rod and what hp level. Is detonation really the big killer of rods or is simply too much power. And does it matter if car will not be at full power very often or very long like just for occasionaly 1/4 mile runs .Most time on street don't even go into boost.
So now worried a bit. So are the ratings not really set in stone and who has bent /broke aftermarket rods and if so what rod and what hp level. Is detonation really the big killer of rods or is simply too much power. And does it matter if car will not be at full power very often or very long like just for occasionaly 1/4 mile runs .Most time on street don't even go into boost.
10-08-2009, 07:10 PM
#4
I have as well. I had scat h-beam rods in my old motor. rated for 900hpand was making closer to 1200hp for 2 years with them. Broke the rod bolts and 2 of them came thru the bottom of the pan. I should of freshened the motor up when i was going to , but didn't.
10-08-2009, 07:13 PM
#5
10-08-2009, 07:53 PM
#6
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number one rod failure is not a rod failure at all,but really a rod bolt failure-this is usually caused by over stretching the fastener,the other is by reusing the fastener too many times.
number 2 rod failure is using the wrong rod for the application.500hp rod in a 1000hp engine.
number 3 is detonation-this will kill a connecting rod no matter how good it is.
just so you know any of the callies rods are safe at an occasional 1000hp with no issues.
number 2 rod failure is using the wrong rod for the application.500hp rod in a 1000hp engine.
number 3 is detonation-this will kill a connecting rod no matter how good it is.
just so you know any of the callies rods are safe at an occasional 1000hp with no issues.
10-09-2009, 12:14 PM
#7
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Shawn is over course right on target. One thing to remember is that steel doesnt fatigue. If that were the case, then every rod would break eventually no matter the power. Aluminum does have a fatigue limit, but a steel rod is good to go, as long as conditions do not change. Ie, detonation, rpm, weight (oil) etc.
It might be good forever at 7486 rpm and 1000 hp, but at 7487 rpm..look out. example.
I agree that the rod bolt is almost always the start of the catastrophe, or other debris in some cases. Debris either changing clearences, or actually getting in the way of the rotating assembly.
It might be good forever at 7486 rpm and 1000 hp, but at 7487 rpm..look out. example.
I agree that the rod bolt is almost always the start of the catastrophe, or other debris in some cases. Debris either changing clearences, or actually getting in the way of the rotating assembly.
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10-09-2009, 01:27 PM
#8
I have bent an Eagle rod with detonation on a nitrous motor. I also broke one in half due to a rod bolt/bearing failure in another motor.
Detonation was caused by a bad fuel noid and the broken rod/ seized bearing was due to an oiling problem I believe.
Detonation was caused by a bad fuel noid and the broken rod/ seized bearing was due to an oiling problem I believe.
