[Z06] Dropped #2 Intake Valve
03-20-2012, 10:18 PM
#1
Pro
Thread Starter
Dropped #2 Intake Valve
Moded 07 with 40K on clock. Mostly highway miles and never tracked.
Car idled in drieway for about 10-15 minutes, gave her a little pedal to clean the throat and tick,tac, rattle, rattle.
What the heck...Quickly shut down the engine and pushed it back in garage. Removed passanger valve cover to see broken inner valve spring, broken retainer and piece parts. I assume interference damage as well.
Wow I am soooo glad this happened in the driveway!
I'll hope for the best and will report back...
Road Trip/Off to Quality Motor Sports for repair.
Hey Carlos Got Parts?
Car idled in drieway for about 10-15 minutes, gave her a little pedal to clean the throat and tick,tac, rattle, rattle.
What the heck...Quickly shut down the engine and pushed it back in garage. Removed passanger valve cover to see broken inner valve spring, broken retainer and piece parts. I assume interference damage as well. Wow I am soooo glad this happened in the driveway! I'll hope for the best and will report back...
Road Trip/Off to Quality Motor Sports for repair.
Hey Carlos Got Parts?
03-20-2012, 10:52 PM
#6
Racer
Member Since: Dec 2006
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Ouch... sorry to hear that, looking at your mods (QM 600 cam & springs, ported TB/Intake,1-7/8" Kooks coated headers with off road X pipe, Harland Sharp rockers, RAM clutch, 100hp wet NOS, C5 axles, Vett Air charger, Halltech CAI ) are the sprigs aftermarket?
What is the build date of your Z? I ask cause I also have an 07Z with 40K miles built in July of 2006
Hope it's just the springs and valves only and no damage to the pistons.
Best of luck and keep us posted.
What is the build date of your Z? I ask cause I also have an 07Z with 40K miles built in July of 2006
Hope it's just the springs and valves only and no damage to the pistons.
Best of luck and keep us posted.
03-20-2012, 11:32 PM
#7
Pro
Thread Starter
All was normal
No signals of pre failure. No oil usage and recent compression test was good.(no leak down test data) All fluids changed regularly, and vehicle responded as normal.
I do have N20 however i haven't sprayed in about two years and have only emptied about 5 (10 lb) bottles since install in 07.
My guess is the valve keeper (grooves)seats were worn aiding to keeper seperation ..Just a hunch
I do have N20 however i haven't sprayed in about two years and have only emptied about 5 (10 lb) bottles since install in 07.
My guess is the valve keeper (grooves)seats were worn aiding to keeper seperation ..Just a hunch
Last edited by NOSZ06; 03-20-2012 at 11:42 PM. Reason: spelling
03-21-2012, 12:23 AM
#8
Ouch... sorry to hear that, looking at your mods (QM 600 cam & springs, ported TB/Intake,1-7/8" Kooks coated headers with off road X pipe, Harland Sharp rockers, RAM clutch, 100hp wet NOS, C5 axles, Vett Air charger, Halltech CAI ) are the sprigs aftermarket?
What is the build date of your Z? I ask cause I also have an 07Z with 40K miles built in July of 2006
Hope it's just the springs and valves only and no damage to the pistons.
Best of luck and keep us posted.
What is the build date of your Z? I ask cause I also have an 07Z with 40K miles built in July of 2006
Hope it's just the springs and valves only and no damage to the pistons.
Best of luck and keep us posted.
03-21-2012, 12:36 AM
#9
Tech Contributor
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03-21-2012, 12:39 AM
#10
Team Owner
Damn man that sucks to hear. Definitely keep us informed.
03-21-2012, 11:50 AM
#13
Safety Car
Member Since: Apr 2006
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Sorry to hear this. I hope it all goes well with the repair. But watch...the LS7 haters will take this and add it to the stats on the "poorly designed valve geometry" that the LS7 has when in fact, it's a modded engine again.
03-21-2012, 12:32 PM
#15
Pro
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03-21-2012, 12:46 PM
#16
Le Mans Master
I wonder if this is just a case of a broken spring?
03-21-2012, 01:15 PM
#17
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03-21-2012, 01:20 PM
#18
OEM are single beehive style springs.
03-21-2012, 01:21 PM
#19
The Consigliere
Member Since: May 2006
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He said they are dual springs; that's aftermarket.
OP, sorry to hear your troubles. Prob need to swap those aftermarket dual springs more often than 33k miles.
Hopefully you don't much internal damage (or any).
03-21-2012, 01:23 PM
#20
Le Mans Master
Moded 07 with 40K on clock. Mostly highway miles and never tracked.
Car idled in drieway for about 10-15 minutes, gave her a little pedal to clean the throat and tick,tac, rattle, rattle. What the heck...Quickly shut down the engine and pushed it back in garage. Removed passanger valve cover to see broken inner valve spring, broken retainer and piece parts. I assume interference damage as well. Wow I am soooo glad this happened in the driveway!
I'll hope for the best and will report back...
Road Trip/Off to Quality Motor Sports for repair.
Hey Carlos Got Parts?
Car idled in drieway for about 10-15 minutes, gave her a little pedal to clean the throat and tick,tac, rattle, rattle.
What the heck...Quickly shut down the engine and pushed it back in garage. Removed passanger valve cover to see broken inner valve spring, broken retainer and piece parts. I assume interference damage as well. Wow I am soooo glad this happened in the driveway! I'll hope for the best and will report back...
Road Trip/Off to Quality Motor Sports for repair.
Hey Carlos Got Parts?
Thats a healthy amount
OP stated they were aftermarket. Doubt its a broken spring since he said the retainer is broken.