Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
BeckyD@RodgersChevrolet
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > General Camaro Forums > Camaro Z/28 Forum - Z/28 Specific Topics

Camaro Z/28 Forum - Z/28 Specific Topics Discussions related to the 5th gen Camaro Z/28 model

Reply
 
Thread Tools
Old 02-17-2014, 01:29 AM   #26
brt3
Runs with scissors...
 
brt3's Avatar
 
Drives: '14 Z/28s SIM/SW
Join Date: Jan 2013
Location: Austin, TX
Posts: 1,016
Quote:
Originally Posted by mkorgan View Post
And how much does this cost if you don't mind sharing?
And I'm pretty certain it throws your factory engine warranty out the window...
__________________
brt3 is offline   Reply With Quote
Old 02-17-2014, 06:38 AM   #27
bada
 
Drives: 1932 pro street truck ZO6 LS7 power
Join Date: Jan 2011
Location: Greenbrier tenn & pennington gap VA.
Posts: 117
Quote:
Originally Posted by mkorgan View Post
And how much does this cost if you don't mind sharing?
I had it done about two years ago. And I think it was around, 7 to 8 hundred dollars. I race the truck on the drag strip, at nostalgia races & street drive it as well. No problems at all, since I had the work done.
bada is offline   Reply With Quote
Old 02-17-2014, 10:09 AM   #28
Unreal

 
Drives: 2006 Z06
Join Date: Oct 2010
Location: Gilbert, AZ
Posts: 2,192
Quote:
Originally Posted by mkorgan View Post
Awesome. I appreciate the fact this issue does not worry you. My brother-in-law has a LS7 in his vette and the dealer told him that there is nothing that they recommend to avoid the issue other than try to avoid high RPM ranges for extended periods of time. They acknowledged it is a known issue with a service bulletin associated with it but they do not do anything to proactively correct the problem as it effects less than 5% of the LS7 produced based on reported incidents. He laughed and said they recommended getting the extended warranty. Nice.
5% is way way way way low. I have seen 10 cars personally with the heads pulled off. 1 of them was within spec, and just barely at 20k miles. The other 9 were way out. I sold my motor to a go that dropped 2 valves, friend dropped a valve in front of me. Another friend dropped a valve. If it is only 5% then I have the unluckiest group of people around me.
__________________
Nick
2006 Corvette Z06 -1047rwhp
Unreal is offline   Reply With Quote
Old 02-18-2014, 01:43 AM   #29
Da Mammer
 
Drives: 2010 camaro SS LSXFoFiddyFo
Join Date: Nov 2012
Location: Pennsyltucky
Posts: 182
I'm one of the unlucky "5%" then. I was Lucky it was still under warranty, but no such warranty anymore, hope the new engines' heads aren't in that "5%"... I had a noisy valve train and burnt 5+ quarts of oil in 2k miles, and GM powertrain said to try the wiggle test, so obviously GM knows it's an issue with the ls7 heads if that's the first thing to troubleshoot/diagnose...
__________________
LSXTC
Da Mammer is offline   Reply With Quote
Old 02-21-2014, 01:20 AM   #30
OldScoolCamaro


 
Drives: Camaro's, always have, always will.
Join Date: Oct 2010
Location: Home of the brave
Posts: 4,859
... the motor has been around for what, 7 years or so? Failures have been well documented. There is an inherent risk with it, as any other line production motor. None more or less with the LS7. But, when it does go....you know what happens. I'd place my bet on it. If I had the Benjamin's...
__________________
In Scott We Trust...all others must show proof.
OldScoolCamaro is offline   Reply With Quote
Old 02-21-2014, 12:36 PM   #31
Col. Brain
 
Drives: 2012 Ram 1980 Malibu
Join Date: Apr 2013
Location: Otherside of the screen
Posts: 294
Quote:
Originally Posted by OldScoolCamaro View Post
... the motor has been around for what, 7 years or so? Failures have been well documented. There is an inherent risk with it, as any other line production motor. None more or less with the LS7. But, when it does go....you know what happens. I'd place my bet on it. If I had the Benjamin's...

Trick Flow seems to think it is a design flaw in the heads themselves from GM. They have new heads coming out (supposedly this year) that will address this issue.

If I was going to track my Z/28 on a regular basis - id go ahead and order those heads and a cam.

The engines are tanks and wouldnt worry about warranty problems. But if such a case arises - throw the old heads and cam back on
Col. Brain is offline   Reply With Quote
Old 02-21-2014, 12:52 PM   #32
Mikebrinda
 
Mikebrinda's Avatar
 
Drives: Ferrari F430 Spider F1 Azzurro Arge
Join Date: Sep 2013
Location: Irvine
Posts: 530
This matter is outside my field of technical expertise, but I am thinking NASA and the space shuttle. Somehow I don't think NASA space shuttle engineers (and my father-in-law was one working for Rockwell) would accept not knowing for an absolute, scientific, empirical data certainty why an engine drops offline.

Imprinting that same attitude into the minds of the LS7 engineering team members . . . tells me there is more known about this issue than is being acknowledged or released to the public. Engineers are just not comfortable with hope, maybe, might, should, and any other derivative of uncertainty. For an engine design as old as this, somebody inside Chevrolet knows precisely what the issue is.
Mikebrinda is offline   Reply With Quote
Old 02-21-2014, 01:37 PM   #33
mkorgan
 
Drives: 1970-1/2 Z-28, 2013 ZL1
Join Date: Sep 2012
Location: Sanford, Fl
Posts: 471
Quote:
Originally Posted by OldScoolCamaro View Post
... the motor has been around for what, 7 years or so? Failures have been well documented. There is an inherent risk with it, as any other line production motor. None more or less with the LS7. But, when it does go....you know what happens. I'd place my bet on it. If I had the Benjamin's...
So, just to make sure I understand what you are saying...you believe that the LS7 has no higher percentage of failure than any line production motor? I just want to make sure that I did not misinterpret your statement.
mkorgan is offline   Reply With Quote
Old 02-21-2014, 09:06 PM   #34
OldScoolCamaro


 
Drives: Camaro's, always have, always will.
Join Date: Oct 2010
Location: Home of the brave
Posts: 4,859
Quote:
Originally Posted by mkorgan View Post
So, just to make sure I understand what you are saying...you believe that the LS7 has no higher percentage of failure than any line production motor? I just want to make sure that I did not misinterpret your statement.
...yes. I don't have the data, but I would think if one drove the LS7 in a normal fashion it wouldn't drop valves for whatever reason it is. I have casually read about it, but have not studied the issue. Hard useage is causing this, along with a material weakness or design flaw. Other line motors diven equally as hard for prolonged periods, or on a regular basis to their limits, will have a failure rate. I for one find this issue still existing to be troubling. As previously mentioned, they know what the flaw is, but the warranty expenditure is acceptable VS the part fix it seems. It must fall within an acceptable failure rate for them not to address it. Being a highly touted hand built motor that is so expensive, and exotic to a degree...it shouldn't be grenading so prolifically or at the rate it is. One would assume it would be stouter and heartier than that. Hollow valves help it twist higher R's it is said, so much for that. Are the valves designed too thin and are structurally weak. Or are the guide tolerances periodically out of wack from the machining process, or is there a dissimilar material wear issue, or is it a geometry issue....???s
__________________
In Scott We Trust...all others must show proof.
OldScoolCamaro is offline   Reply With Quote
Old 02-21-2014, 09:39 PM   #35
2ss-booya

 
2ss-booya's Avatar
 
Drives: 2013 ZL1 CRT 6M
Join Date: Dec 2009
Location: SoCal
Posts: 890
Send a message via Skype™ to 2ss-booya
I had the same mentality with the oil pump issue on most GM v8's...I figured..hey it's just a rumor...and it's probably less than 5% of sold cars...so what the heck


Then it happened to me...
2ss-booya is offline   Reply With Quote
Old 02-21-2014, 09:58 PM   #36
kevint
 
Drives: 2013 1SS
Join Date: Dec 2012
Location: New Jersey
Posts: 284
Quote:
Originally Posted by Mikebrinda View Post
Engineers are just not comfortable with hope, maybe, might, should, and any other derivative of uncertainty.
We call those "soft" words.
kevint is online now   Reply With Quote
Old 02-21-2014, 11:55 PM   #37
OldScoolCamaro


 
Drives: Camaro's, always have, always will.
Join Date: Oct 2010
Location: Home of the brave
Posts: 4,859
...bottom line is...speed equipment manufacturers. Since the beginning of automotive time, the gap in performance has been filled by aftermarket companies. Build it bigger, better, faster. OEM only takes one part of the way. To go the mile, with rock solid certainty within a reasonable degree...you gotta upgrade. Nothing new there. Like it was said before, the cylinder heads and valvetrain need to be upgraded to maximize performance and reliability with the LS7 or you risk catastrophic results. Stand on it, cross your fingers, and place your bet. If outta warranty.., and it goes south and you suck a valve...thanks for playing Chevy.
__________________
In Scott We Trust...all others must show proof.
OldScoolCamaro is offline   Reply With Quote
Old 02-23-2014, 02:42 PM   #38
b4z

 
Drives: '06 Pontiac GTO M6, '09 V8 SRX RWD
Join Date: Nov 2008
Location: Charleston, SC
Posts: 1,201
It's not just speed equipment manufacturers, but also replacement manufacturers. They will often do a slight redesign or part substitution to a component so that what once was a common failure never, or almost never happens again for the life of the part.
b4z is offline   Reply With Quote
Old 02-24-2014, 12:15 AM   #39
OldScoolCamaro


 
Drives: Camaro's, always have, always will.
Join Date: Oct 2010
Location: Home of the brave
Posts: 4,859
And that is true. It's like the Government versus private industry. One performs a certain function, and one can do it better.
__________________
In Scott We Trust...all others must show proof.
OldScoolCamaro is offline   Reply With Quote
Old 02-24-2014, 09:23 AM   #40
Col. Brain
 
Drives: 2012 Ram 1980 Malibu
Join Date: Apr 2013
Location: Otherside of the screen
Posts: 294
Quote:
Originally Posted by OldScoolCamaro View Post
And that is true. It's like the Government versus private industry. One performs a certain function, and one can do it better.

Except GM has to stay within certain guidlines (CAFE) and aftermarket can just slap on a sticker that states "for off road use only"
Col. Brain is offline   Reply With Quote
Old 03-01-2014, 11:44 PM   #41
OldScoolCamaro


 
Drives: Camaro's, always have, always will.
Join Date: Oct 2010
Location: Home of the brave
Posts: 4,859
^...and that goes without saying. Furthermore I would like to say you hit the nail on the head exactly. I posted earlier on another thread the belief GM makes a sound baseline motor for much room to grow and expand on power and durability in the aftermarket realm. This has been the case since the Gen 1 engine. From a manufacturers standpoint with all the constraints placed on them, profit margin, regulations, risk versus return,...their hands are tied as to what they can bring to market to consumers who for the most part are only stressing the product to it's limits in a small percentage of ownership.
__________________
In Scott We Trust...all others must show proof.
OldScoolCamaro is offline   Reply With Quote
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 09:30 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.