Newbie with LS7 Questions
06-25-2017, 12:09 AM
#101
Burning Brakes
I did a statistical analysis once (see my prior posts). It was something like, with 30,000 z06s as a population, to get within +/- 10% accuracy we need a sample size of like 4 or 5 hundred cars. So if you look at the out of spec registry thread below, and it's sister thread the in-spec registry, there were 200 out of spec and about 25 in spec.
So my statistics are a bit rusty, but I think I could say with about 100 percent confidence that at least half of them are f'd up.
also, there was a helpful member here who used to keep a record of all the ls7 failures, see his old posts. He had about 35 dropped valve cases documented in his spreadsheet. That was years ago.
Another statistical analysis I did was on the mileage distribution...I concluded that the z06 population was not accumulating mileage very fast, in fact we wouldn't see most failures for years.
Guess what? Gm concluded the same thing. They'll be out of warranty before they pop, so as long as nobody spins into a semi on the interstate, we don't have to do a recall. Lol there have been two fires posted due to dropped valves with pictures.
So believe it or not, 6.5 failures per thousand may have been a true statement at one point in time, say, when the vast majority of all the ls7 had less than 20k miles. But what will the failure rate be when they've all had a 100k miles?
Hopefully it will be a lot lower because of people being proactive on this forum.
https://www.corvetteforum.com/forums/c6-corvette-zr1-and-z06/3386141-the-out-of-spec-guide-wear-registry.html
https://www.corvetteforum.com/forums/c6-corvette-zr1-and-z06/3385533-the-in-spec-guide-wear-registry.html
So my statistics are a bit rusty, but I think I could say with about 100 percent confidence that at least half of them are f'd up.
also, there was a helpful member here who used to keep a record of all the ls7 failures, see his old posts. He had about 35 dropped valve cases documented in his spreadsheet. That was years ago.
Another statistical analysis I did was on the mileage distribution...I concluded that the z06 population was not accumulating mileage very fast, in fact we wouldn't see most failures for years.
Guess what? Gm concluded the same thing. They'll be out of warranty before they pop, so as long as nobody spins into a semi on the interstate, we don't have to do a recall. Lol there have been two fires posted due to dropped valves with pictures.
So believe it or not, 6.5 failures per thousand may have been a true statement at one point in time, say, when the vast majority of all the ls7 had less than 20k miles. But what will the failure rate be when they've all had a 100k miles?
Hopefully it will be a lot lower because of people being proactive on this forum.
https://www.corvetteforum.com/forums/c6-corvette-zr1-and-z06/3386141-the-out-of-spec-guide-wear-registry.html
https://www.corvetteforum.com/forums/c6-corvette-zr1-and-z06/3385533-the-in-spec-guide-wear-registry.html
The following users liked this post:
MTPZ06 (06-26-2017)
06-25-2017, 12:19 AM
#102
Team Owner
I did a statistical analysis once (see my prior posts). It was something like, with 30,000 z06s as a population, to get within +/- 10% accuracy we need a sample size of like 4 or 5 hundred cars. So if you look at the out of spec registry thread below, and it's sister thread the in-spec registry, there were 200 out of spec and about 25 in spec.
So my statistics are a bit rusty, but I think I could say with about 100 percent confidence that at least half of them are f'd up.
also, there was a helpful member here who used to keep a record of all the ls7 failures, see his old posts. He had about 35 dropped valve cases documented in his spreadsheet. That was years ago.
Another statistical analysis I did was on the mileage distribution...I concluded that the z06 population was not accumulating mileage very fast, in fact we wouldn't see most failures for years.
Guess what? Gm concluded the same thing. They'll be out of warranty before they pop, so as long as nobody spins into a semi on the interstate, we don't have to do a recall. Lol there have been two fires posted due to dropped valves with pictures.
So believe it or not, 6.5 failures per thousand may have been a true statement at one point in time, say, when the vast majority of all the ls7 had less than 20k miles. But what will the failure rate be when they've all had a 100k miles?
Hopefully it will be a lot lower because of people being proactive on this forum.
https://www.corvetteforum.com/forums...-registry.html
https://www.corvetteforum.com/forums...-registry.html
So my statistics are a bit rusty, but I think I could say with about 100 percent confidence that at least half of them are f'd up.
also, there was a helpful member here who used to keep a record of all the ls7 failures, see his old posts. He had about 35 dropped valve cases documented in his spreadsheet. That was years ago.
Another statistical analysis I did was on the mileage distribution...I concluded that the z06 population was not accumulating mileage very fast, in fact we wouldn't see most failures for years.
Guess what? Gm concluded the same thing. They'll be out of warranty before they pop, so as long as nobody spins into a semi on the interstate, we don't have to do a recall. Lol there have been two fires posted due to dropped valves with pictures.
So believe it or not, 6.5 failures per thousand may have been a true statement at one point in time, say, when the vast majority of all the ls7 had less than 20k miles. But what will the failure rate be when they've all had a 100k miles?
Hopefully it will be a lot lower because of people being proactive on this forum.
https://www.corvetteforum.com/forums...-registry.html
https://www.corvetteforum.com/forums...-registry.html
DH
06-26-2017, 01:41 PM
#103
Burning Brakes
I did a statistical analysis once (see my prior posts). It was something like, with 30,000 z06s as a population, to get within +/- 10% accuracy we need a sample size of like 4 or 5 hundred cars. So if you look at the out of spec registry thread below, and it's sister thread the in-spec registry, there were 200 out of spec and about 25 in spec.
So my statistics are a bit rusty, but I think I could say with about 100 percent confidence that at least half of them are f'd up.
also, there was a helpful member here who used to keep a record of all the ls7 failures, see his old posts. He had about 35 dropped valve cases documented in his spreadsheet. That was years ago.
Another statistical analysis I did was on the mileage distribution...I concluded that the z06 population was not accumulating mileage very fast, in fact we wouldn't see most failures for years.
Guess what? Gm concluded the same thing. They'll be out of warranty before they pop, so as long as nobody spins into a semi on the interstate, we don't have to do a recall. Lol there have been two fires posted due to dropped valves with pictures.
So believe it or not, 6.5 failures per thousand may have been a true statement at one point in time, say, when the vast majority of all the ls7 had less than 20k miles. But what will the failure rate be when they've all had a 100k miles?
Hopefully it will be a lot lower because of people being proactive on this forum.
https://www.corvetteforum.com/forums...-registry.html
https://www.corvetteforum.com/forums...-registry.html
So my statistics are a bit rusty, but I think I could say with about 100 percent confidence that at least half of them are f'd up.
also, there was a helpful member here who used to keep a record of all the ls7 failures, see his old posts. He had about 35 dropped valve cases documented in his spreadsheet. That was years ago.
Another statistical analysis I did was on the mileage distribution...I concluded that the z06 population was not accumulating mileage very fast, in fact we wouldn't see most failures for years.
Guess what? Gm concluded the same thing. They'll be out of warranty before they pop, so as long as nobody spins into a semi on the interstate, we don't have to do a recall. Lol there have been two fires posted due to dropped valves with pictures.
So believe it or not, 6.5 failures per thousand may have been a true statement at one point in time, say, when the vast majority of all the ls7 had less than 20k miles. But what will the failure rate be when they've all had a 100k miles?
Hopefully it will be a lot lower because of people being proactive on this forum.
https://www.corvetteforum.com/forums...-registry.html
https://www.corvetteforum.com/forums...-registry.html
06-26-2017, 06:02 PM
#104
Team Owner
Hard to believe in 2017 that people still drink the 1% Kool-Aid...
06-27-2017, 10:15 PM
#106
Ok, newbie here, but I close to buying a 2008 Z06, and I think I got my questions answered.
1. Ask for $2 to $3000 off on the Z06 because they can not verify that the valves have be done and nothing on the carfax show any valve work or replacement.
2. Don't buy the GM replacement heads they are the same.
3. Or have them check every couple of years for wear.
4. Don't argue with Notreokc or Nuke61 and Michael D.
1. Ask for $2 to $3000 off on the Z06 because they can not verify that the valves have be done and nothing on the carfax show any valve work or replacement.
2. Don't buy the GM replacement heads they are the same.
3. Or have them check every couple of years for wear.
4. Don't argue with Notreokc or Nuke61 and Michael D.
Last edited by SSmoothZ06; 06-27-2017 at 10:50 PM.
06-27-2017, 10:27 PM
#107
Team Owner
Pretty close. Carfax doesn't show maintenance. Put Notreokc on ignore, so you don't have to see his stuff. Don't buy anything from GM unless you have too, and checking every couple of years just depends on setup. If it is a big cam aggressive setup, yep.
06-28-2017, 11:50 AM
#108
FYI, I've looked at a total 5 Z06's and 2 have had there motors replaced under 50,000 miles.
don't know the circumstance of what the reason was.
Here is another:
https://seattle.craigslist.org/see/cto/6176939646.html
don't know the circumstance of what the reason was.
Here is another:
https://seattle.craigslist.org/see/cto/6176939646.html
07-07-2017, 01:56 PM
#109
As everyone has tried huh? Tried what? To prove your opinion is right and mine is wrong? If not jumping on the bandwagon is stupid I'd prefer that over joining the masses.
07-07-2017, 02:01 PM
#110
So you want to tell me your stats? I would love to hear them. With roughly 7K Z's made a year for 8 years, give or take each model year that is about ~56K LS7's made.
How many needed to be replaced? How many blew up? If it is not 1%, what is it? 2%? 5%
Please enlighten me. Because that is still 95% that had zero issues. Including mine. Do you not like those odds?
How many needed to be replaced? How many blew up? If it is not 1%, what is it? 2%? 5%
Please enlighten me. Because that is still 95% that had zero issues. Including mine. Do you not like those odds?
Last edited by NotreOkc; 07-07-2017 at 02:19 PM.
07-07-2017, 02:03 PM
#111
Jumping on that bandwagon is pretty easy huh? Some might call that stupid or simple minded.
I'll reside with the ~95% (give or take, since my 1% is apparently ludacris) that never had an issue including me.
That 2-3K you are going to spend on fixing this HUGE issue, I put in the bank and towards my ZR1. Thanks.
I'll reside with the ~95% (give or take, since my 1% is apparently ludacris) that never had an issue including me.
That 2-3K you are going to spend on fixing this HUGE issue, I put in the bank and towards my ZR1. Thanks.
07-07-2017, 02:17 PM
#112
Team Owner
So you want to tell me your stats? I would love to hear them. With roughly 7K Z's made a year for 8 years, give or take each model year that is about 57K LS7's made.
How many needed to be replaced? How many blew up? If it is not 1%, what is it? 2%? 5%
Please enlighten me. Because that is still 95% that had zero issues. Including mine. Do you not like those odds?
How many needed to be replaced? How many blew up? If it is not 1%, what is it? 2%? 5%
Please enlighten me. Because that is still 95% that had zero issues. Including mine. Do you not like those odds?
I don't wish to enlighten you on anything; go on believing what you want...matters little to me.
07-07-2017, 02:27 PM
#113
Once again, proving you need to go back and do some homework...because your production numbers are WAY off. The information is out there and easily accessible...you just appear to be unwilling to do any sort of fact checking.
I don't wish to enlighten you on anything; go on believing what you want...matters little to me.
I don't wish to enlighten you on anything; go on believing what you want...matters little to me.