[Z06] MY Engine Seized ....!!!
02-26-2008, 10:07 AM
#23
Supporting Vendor
Member Since: Oct 2002
Location: Cleveland OH
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St. Jude Donor '11,'13
i am sorry that sucks . please let us know your fidings. i only have 1,500 miles on my 08 and this is the kind of stuff that makes me think wow i should really rebuild this motor with better parts while the car is hiding from the snow.
02-26-2008, 10:28 AM
#25
Melting Slicks
Member Since: May 2007
Location: Houston Texas
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2015 C7 of Year Finalist
Exactly what I did. I just moved from Chicago. In Feb 2007, with 800 miles on the Odometer, I shipped the car to Lingenfelter's, got the 630-HP package mod, and got the car back in the spring. They did the heated garage storage for me.
02-26-2008, 10:32 AM
#26
Premium Supporting Vendor
Rocker arm failures have been few and far between, yet heavily exploited on the internet. I can tell you that we have never failed a production rocker arm on an LS7. We have tested hundreds of LS7s for GM, private, and our own and we have yet to see one fail. We have run professional race engines with production rocker arms through gruelling tests and not one problem. I'm also pretty sure that we have never had a production LS7 valve spring be the root cause of failure on a stock engine. Modified engines or racing applications I would recommend switching to an aftermarket single beehive spring, not a double. In the testing we have done, we have always found the single beehive spring to have better valvetrain dynamics than a double....
02-26-2008, 10:39 AM
#27
When I replaced my valvesprings with double springs, I noticed that they were just coming apart
as in the edges were cracked already.
02-26-2008, 10:42 AM
#28
Premium Supporting Vendor
there definitely IS a problem with the LS7 valve spring, at least I know of 10 people who replaced their engines due to valve-spring issue in Dubai alone.
When I replaced my valvesprings with double springs, I noticed that they were just coming apart as in the edges were cracked already.
When I replaced my valvesprings with double springs, I noticed that they were just coming apart
as in the edges were cracked already.
02-26-2008, 10:47 AM
#29
Le Mans Master
you say overrev, but I thought the motor has an electronic limiter? Are you talking like a mechanical overrev where the user possibly downshifted 5-2 and the electronic limiter was outmatched? spring survives that episode.....but it's now weakened and then it lets go later at even daily driver type use level?
02-26-2008, 10:52 AM
#30
Premium Supporting Vendor
you say overrev, but I thought the motor has an electronic limiter? Are you talking like a mechanical overrev where the user possibly downshifted 5-2 and the electronic limiter was outmatched? spring survives that episode.....but it's now weakened and then it lets go later at even daily driver type use level?
02-26-2008, 10:55 AM
#31
Le Mans Master
there definitely IS a problem with the LS7 valve spring, at least I know of 10 people who replaced their engines due to valve-spring issue in Dubai alone.
When I replaced my valvesprings with double springs, I noticed that they were just coming apart as in the edges were cracked already.
When I replaced my valvesprings with double springs, I noticed that they were just coming apart
as in the edges were cracked already.
02-26-2008, 10:56 AM
#32
Premium Supporting Vendor
02-26-2008, 10:58 AM
#33
Burning Brakes
While it's easy to go ahead of ourselves, even though it certainly looks like a valve train issue... we won't know for sure until the OP reports back with the actual findings. It does however make me feel the need to replace my stock rockers and springs just for peace of mind. 
Good luck and I hope it gets resolved with as little stress as possible.
Good luck and I hope it gets resolved with as little stress as possible.
02-26-2008, 11:05 AM
#34
Le Mans Master
ok, I see. Thats the problem on the net trying to analyze these "issues". I'm not sure I have a lot of sympathy if a user mechanically over-revved the car and then it later pops. I'm not sure how much "disclosure" we ever get on the forums. All I ever hear is "I was cruising down the highway under 3K and it let go...", but they forget to tell you about the blatant overrev 500 miles ago. and I'm not trying to single anyone out; for all I know, the owner could have bought the car used and we don't know the history OR even a one owner car could have had service done and some punk decided to test drive a 7.0 liter c6z while its in for service. So many things that can go wrong 
02-26-2008, 11:09 AM
#35
Premium Supporting Vendor
ok, I see. Thats the problem on the net trying to analyze these "issues". I'm not sure I have a lot of sympathy if a user mechanically over-revved the car and then it later pops. I'm not sure how much "disclosure" we ever get on the forums. All I ever hear is "I was cruising down the highway under 3K and it let go...", but they forget to tell you about the blatant overrev 500 miles ago. and I'm not trying to single anyone out; for all I know, the owner could have bought the car used and we don't know the history OR even a one owner car could have had service done and some punk decided to test drive a 7.0 liter c6z while its in for service. So many things that can go wrong
02-26-2008, 11:23 AM
#36
Safety Car
02-26-2008, 11:32 AM
#37
Former Vendor
Was the sound like someone was banging the block with a hammer or like a exhaust leak? Most valve spring issues sound like a exhaust leak or a ticking sound. Rod knock sounds like you will never forget. Rod bearings hate anything close to the big D word because it increases the load by X times.
There is a rental Ford Sports racer shop about 30 miles south of the shop. They have a over rev light on the dash. If at any point you over rev it. Big $$$ They charge for a rebuild of the top end of the engine.
I have seen more **** poor down shifting and instruction on heel-toe.
Randy
www.dougrippie.com
There is a rental Ford Sports racer shop about 30 miles south of the shop. They have a over rev light on the dash. If at any point you over rev it. Big $$$ They charge for a rebuild of the top end of the engine.
I have seen more **** poor down shifting and instruction on heel-toe.
Randy
www.dougrippie.com
02-26-2008, 11:39 AM
#38
Pro
Member Since: Feb 2006
Location: Blacklick Ohio
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Here is pictures of my 07 Z with 3500 miles on it. The wife was driving with my son in the car. Stoped at a stop sign, turned right and the car just shut off. No noise, nothing, just stoped. Here are some pictures of the damage. What you can't see in the one picture is a crack in the block. 
02-26-2008, 11:47 AM
#39
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ok, I see. Thats the problem on the net trying to analyze these "issues". I'm not sure I have a lot of sympathy if a user mechanically over-revved the car and then it later pops. I'm not sure how much "disclosure" we ever get on the forums. All I ever hear is "I was cruising down the highway under 3K and it let go...", but they forget to tell you about the blatant overrev 500 miles ago. and I'm not trying to single anyone out; for all I know, the owner could have bought the car used and we don't know the history OR even a one owner car could have had service done and some punk decided to test drive a 7.0 liter c6z while its in for service. So many things that can go wrong
I could agree that maybe the problem originally started not when the wife was driving the car, but more when I was racing it. I think if they know the motor can go past 7k rpms mechanically, they should put springs in to handle 7500. A better safety margin then a spring that can only handle exactly 7000 rpms.
