[Z06] Has a LS7 Ti rod ever failed?
#1
Burning Brakes
Thread Starter
Has a LS7 Ti rod ever failed?
Has anyone seen/heard/touched or smelt a LS7 Ti rod that has failed due to over-stressing? I have heard speculation, but have yet to see any confirmed failures (doesnt help that you cannot search "Ti" as it is only 2 letters).
Closest I found is the below thread. The rod failure mentioned seemed to occur after piston failure so not really applicable...
http://forums.corvetteforum.com/c6-z...y-upgrade.html
If there is a "yes" to the question, what was the HP and the suspected cause?
Closest I found is the below thread. The rod failure mentioned seemed to occur after piston failure so not really applicable...
http://forums.corvetteforum.com/c6-z...y-upgrade.html
If there is a "yes" to the question, what was the HP and the suspected cause?
#2
Drifting
Jason at Katech shared this picture with me...but I don't know the application. I had a local engine builder tell me that Titanium does not bend...it will only break. This picture shows that it will bend.
#3
Drifting
#6
Premium Supporting Vendor
Woah, woah woah. Lets be clear. That rod bent because the piston failed. It was not the root cause. We've never failed an LS7 rod (root cause).
#9
Drifting
#10
Burning Brakes
Thread Starter
That picture is a good recommendation for the Ti rods. I would love to know the upper safe limit for HP.
#11
Melting Slicks
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As you can see from the photo Jason provided, that's not the case with the LS7 rods.
There are all kinds of uninformed "local engine builders" around. Exactly what are the qualifications required to become an "engine builder" other than enough unsuspecting customers to keep said builder in business?
Frank Gonzalez
#12
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#13
Melting Slicks
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Pistons and rod bolts swapped out and your good!!!!! (stock rods and crank are great pieces). Some charge quite a bit to balance the rotating assembly when using stock rods, stock forge crank and forge aftermarket pistons..
Most will say that the root cause of failure is the stock pistons or rod bolts..
Most will say that the root cause of failure is the stock pistons or rod bolts..
Last edited by BADZ; 07-07-2009 at 01:01 PM.
#14
Safety Car
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I think Katech likes the solid silcone bronze wrist pin bushings in the rods too, probably a bit more stable at high loads and less prone to deformation. I believe the factory ones are split bushings.
#16
Safety Car
I have personally seen and held a set of Ti rods that were ALL bent due to a greedy owner with too much nitrous. The liners were all cracked and the pistons were in a bazillion pieces or two!
So, Piston failure was the cause and the rod just twisted over. Now, what surprised me was just how "well" the Ti Rods took the damage after seeing what the pistons looked like.
Any idea what machine shops are charging to balance a forged piston+stock crank/rods? Norm.?
So, Piston failure was the cause and the rod just twisted over. Now, what surprised me was just how "well" the Ti Rods took the damage after seeing what the pistons looked like.
Any idea what machine shops are charging to balance a forged piston+stock crank/rods? Norm.?
#17
Premium Supporting Vendor
I have personally seen and held a set of Ti rods that were ALL bent due to a greedy owner with too much nitrous. The liners were all cracked and the pistons were in a bazillion pieces or two!
So, Piston failure was the cause and the rod just twisted over. Now, what surprised me was just how "well" the Ti Rods took the damage after seeing what the pistons looked like.
Any idea what machine shops are charging to balance a forged piston+stock crank/rods? Norm.?
So, Piston failure was the cause and the rod just twisted over. Now, what surprised me was just how "well" the Ti Rods took the damage after seeing what the pistons looked like.
Any idea what machine shops are charging to balance a forged piston+stock crank/rods? Norm.?
So the Ti rods were not the root cause of failure. The original poster is asking for root cause.
#18
Melting Slicks
haven't backed that one up yet on the dyno, but its got to be close with the new heads.... we were only 28hp away with the stock heads. I can tell you one thing, the motor revs like no other with the stock Ti rods, callies magnum crank and Katech pistons.
+1 for rebushed Ti rods holding up just fine.
#19
Le Mans Master
Man, you guys are good. Can you help me figure out what went wrong coming out of turn four at Charlotte Motor Speedway in 1987?
Thanks, in advance, for all your help!
Jim
Thanks, in advance, for all your help!
Jim
#20