Titanium Will Bend
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Well since we are playing "you show me yours and I'll show you mine" carnage photos..here are a couple more bloody photos.... a little LS2 rod bolt failure..GM didn't want this one back..the customer who did it had a history of blowing up motors in his Corvettes..he paid the bill for the new crate engine.
TECH Apprentice
Joined: Feb 2005
Posts: 345
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From: TX
https://ls1tech.com/forums/generation-iii-internal-engine/728254-comp-cams-918-spring-broke.html
Why 918s suddenly started to show failures (Comp went with a different supplier) made obvious by Chris Osborn's post here:
http://web.camaross.com/forums/showthread.php?t=526319
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Titanium parts in a street car.........
Um, they did titanium valves and rods so they can spin the motor to 7K rpms. The titanium intake valves vs steel ones saves you over 30 grams per ONE valve, so if you add that up over the 8 valves, and the lighter beehive springs vs the dual, you have MUCH better valvetrain dynamics, faster revving etc... And the engine wouldn't particularly be "fine" with double springs because that one little spring can't control a heavy *** steel valve of that size and length so you'd most likely smack a piston into the valve and possibly snap the valve off the stem and boom, you need a new motor.
I think I'll stick with the Titanium in my street car.....
I think I'll stick with the Titanium in my street car.....
Thread Starter
Joined: Jul 2003
Posts: 7,067
Likes: 9
From: HOT'LANA, GAWJA
Thread Starter
Joined: Jul 2003
Posts: 7,067
Likes: 9
From: HOT'LANA, GAWJA
^ I think that's what happened to mine except it was on startup so not as extreme. The damage looks really similar though. I haven't torn it down yet.
Crappy 98 rod bolts.
That guy must have tried something stupid to have a rod bolt fail on a less than two year old engine.
Crappy 98 rod bolts.
That guy must have tried something stupid to have a rod bolt fail on a less than two year old engine.
TECH Resident
Joined: Jun 2007
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Yes he mechanicly over reved it..thought he was going from 6th to 5th gear and went to 3rd instead..rod bolt broke and tried to saw the engine in half..the guy has a long history of stupid situations with Corvettes .. that is the reason he had to buy the new engine..the photo is about two years old.. it happened a while back..
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Verdad Gallardo Banned
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I had 8 broken springs, my valves are steel, and my engine is perfect because I had double springs. Rev limiter is at 7,300 rpm. 427ci LS6. Drove around with them broken for months and didn't know it. Because 8 springs don't break all at the same time.
Therefore.....Double springs have one purpose and ONE purpose ONLY, to save an engine when a spring breaks. So, if GM had spent a little more money, very little, and used double springs, that engine would not have had ANY damage, except to the broken springs.
I bet that Vette owner would have paid another $200 for his Vette to have better protection, which means a BETTER engine overall.
That's not something you see very often with an LS7.
BTW, the factory rev limiter is set at 7,200, not 7,000. It may not sound like much, but I sure to love those extra two hundred RPM's.
BTW, the factory rev limiter is set at 7,200, not 7,000. It may not sound like much, but I sure to love those extra two hundred RPM's.
Last edited by Outlaw1; Dec 20, 2007 at 01:08 PM.
Thread Starter
Joined: Jul 2003
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From: HOT'LANA, GAWJA
I know that. Are you saying a double spring would NOT have saved this mess from happening?
I had 8 broken springs, my valves are steel, and my engine is perfect because I had double springs. Rev limiter is at 7,300 rpm. 427ci LS6. Drove around with them broken for months and didn't know it. Because 8 springs don't break all at the same time.
Therefore.....Double springs have one purpose and ONE purpose ONLY, to save an engine when a spring breaks. So, if GM had spent a little more money, very little, and used double springs, that engine would not have had ANY damage, except to the broken springs.
I bet that Vette owner would have paid another $200 for his Vette to have better protection, which means a BETTER engine overall.
I had 8 broken springs, my valves are steel, and my engine is perfect because I had double springs. Rev limiter is at 7,300 rpm. 427ci LS6. Drove around with them broken for months and didn't know it. Because 8 springs don't break all at the same time.
Therefore.....Double springs have one purpose and ONE purpose ONLY, to save an engine when a spring breaks. So, if GM had spent a little more money, very little, and used double springs, that engine would not have had ANY damage, except to the broken springs.
I bet that Vette owner would have paid another $200 for his Vette to have better protection, which means a BETTER engine overall.
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It had to be at least 8 months with one or all of the broken springs. When I took the valve covers off there were 4 broken springs on each head.
And as I said once, and I'll say it again.....you would have to believe that all 8 broke at the SAME exaxct time to think I wasn't driving around like that for a long time. This is a 100% street car and has never seen a track. 490 RWHP street stroker.
Even after 40 years in the biz you still see new, crazy ****, eh!!!
