[Z06] 10k miles bronze valve guides ss valves bad
09-27-2013, 03:23 PM
#1
Heel & Toe
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10k miles bronze valve guides ss valves bad
tanner posted this on ls1 tech......http://ls1tech.com/forums/generation...ze-guides.html
09-27-2013, 03:48 PM
#2
Le Mans Master
Interesting findings, I had a feeling it would only be a matter of time before one these surfaced. Though this news may not be well received around here from a new member named "Z06pos". Did not know Tanner got banned...
09-27-2013, 03:48 PM
#3
Burning Brakes
tanner posted this on ls1 tech......http://ls1tech.com/forums/generation...ze-guides.html
This will be fun to follow. Is this not "The FIX"? S.S valves with bronze guides..
09-27-2013, 03:51 PM
#4
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09-27-2013, 03:56 PM
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09-27-2013, 03:58 PM
#7
Le Mans Master
09-27-2013, 04:02 PM
#8
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09-27-2013, 04:04 PM
#10
Burning Brakes
09-27-2013, 04:08 PM
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09-27-2013, 04:08 PM
#12
Le Mans Master
Yeah, it's unfortunate to see so many topics on this. I usually see the response of "It's not a problem, the forum is a small segment of Z owners", but by that logic, could the problem be even bigger because people simply do not report to this forum? There is a problem, whether people want to acknowledge it or not.
09-27-2013, 04:28 PM
#14
Were it my car, I'd want to know from them why these only heads only lasted for 10K miles.This car had Ferrea Superalloy valves in it, and Yella Terra rockers.
The guy in the second post in the thread, asks some interesting questions.
On a side note, this really is nothing "new", per se, in that something similar happened to one of our other forum members, Veech, who only got about 4,000 miles out of his SS valve/Bronze guide heads, and it was long ago since described in here.
Follow the thread:
http://forums.corvetteforum.com/c6-z...post1581924068
http://forums.corvetteforum.com/c6-z...post1583301272
The other thing I found odd about this one, is that in a prior discussion with another forum member. Anyway, he wrote the following:
Here is a better question to ask..."Who has had their heads reworked, while retaining the stock valves, and still experienced a catastrophic, valve induced, engine failure?"
My 2009 Z has reworked heads by Livernois, with stock valves. They found 2 guides that were slightly worn at 10k miles. They were replaced, and the rest were left alone. All machine work was done in house, by them. Car now has 25k on it, with a big cam and 600rwhp. They claim that they have not seen any valve failures with any of their reworked heads and stock valves. They could have charged me more to install heavier SS valves, but said that it was absolutely unnecessary and would only add add weight to the valvetrain. Their position is that some of the guides were improperly machined, and that the stock valve springs are marginal at best, which allow the valves to become unstable at high rpm. If I am feeling ambitious this winter, I may pull some springs, and do a "wiggle test", to see how things are going. I will definitely report any findings.
There really is only ONE major shop recommending solid valves...the rest just follow suit, because they outsource their heads there. I'm not saying the REV valves are bad, that they are a poor choice, or that they are going to destroy the engine...but it is a fact that they are heavier, and will run into stability issues earlier than lighter ones will. The question is, where does that instability come into play, and what are its effects...
My 2009 Z has reworked heads by Livernois, with stock valves. They found 2 guides that were slightly worn at 10k miles. They were replaced, and the rest were left alone. All machine work was done in house, by them. Car now has 25k on it, with a big cam and 600rwhp. They claim that they have not seen any valve failures with any of their reworked heads and stock valves. They could have charged me more to install heavier SS valves, but said that it was absolutely unnecessary and would only add add weight to the valvetrain. Their position is that some of the guides were improperly machined, and that the stock valve springs are marginal at best, which allow the valves to become unstable at high rpm. If I am feeling ambitious this winter, I may pull some springs, and do a "wiggle test", to see how things are going. I will definitely report any findings.
There really is only ONE major shop recommending solid valves...the rest just follow suit, because they outsource their heads there. I'm not saying the REV valves are bad, that they are a poor choice, or that they are going to destroy the engine...but it is a fact that they are heavier, and will run into stability issues earlier than lighter ones will. The question is, where does that instability come into play, and what are its effects...
So even though I had heard of the case described in Z06pos thread here, I was surprised by the comments which I had read from MyLS1Hauls.
09-27-2013, 04:33 PM
#15
Supporting Tuner
Truthfully, we would need to see the heads to help determine the cause. The one thing I do notice is that there is mention of shaft mount rockers. If this is the case, I still feel the valve float issue is what is really causing these guide wear problems. Even with our springs, which are likely the most capable spring on the market, they will not support the weight of an aftermarket rocker arm. This is why we strongly oppose aftermarket rockers.
09-27-2013, 04:48 PM
#18
Truthfully, we would need to see the heads to help determine the cause. The one thing I do notice is that there is mention of shaft mount rockers. If this is the case, I still feel the valve float issue is what is really causing these guide wear problems. Even with our springs, which are likely the most capable spring on the market, they will not support the weight of an aftermarket rocker arm. This is why we strongly oppose aftermarket rockers.
09-27-2013, 05:09 PM
#20
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Truthfully, we would need to see the heads to help determine the cause. The one thing I do notice is that there is mention of shaft mount rockers. If this is the case, I still feel the valve float issue is what is really causing these guide wear problems. Even with our springs, which are likely the most capable spring on the market, they will not support the weight of an aftermarket rocker arm. This is why we strongly oppose aftermarket rockers.
Last edited by z06pos; 09-27-2013 at 05:25 PM.