Has anyone actually been denied warranty because of a catch can?
03-20-2018, 12:36 PM
#41
I'm scratching my head here after reading the thread above, which you say constitutes "proof." Where is the proof in that thread that catch cans eliminate valve coking? The only proof we have is that catch cans catch a little oil. That's a far cry from implicating oil in the LT1/4 intake as the major cause of valve coking. However, most importantly, there is no evidence that valve coking causes problems on those engines.
Regardless, "proof" would require a random sample of cars w/o an oil capture system, driven under nearly identical conditions compared to a random sample of cars with. However, even the single data point you cite is ambiguous at best, and no one else in thread provided any evidence either.
Regardless, "proof" would require a random sample of cars w/o an oil capture system, driven under nearly identical conditions compared to a random sample of cars with. However, even the single data point you cite is ambiguous at best, and no one else in thread provided any evidence either.
Last edited by Foosh; 03-20-2018 at 01:24 PM.
03-20-2018, 01:02 PM
#42
Race Director
Catch can all you want but it sounds like a useless hassle to me.
Oil coking on the intake valve comes from the small amount of oil that gets past the valve guides.
Oil coking on the intake valve comes from the small amount of oil that gets past the valve guides.
03-20-2018, 03:28 PM
#43
Drifting
that's the problem with proof; it is only available for people willing to see it.
https://www.corvetteforum.com/forums...a-problem.html
https://www.corvetteforum.com/forums...a-problem.html
Secondly, there's no proof that shows where the oil is going to cause serious long term issues. In fact, look at what this member has to say :
I just looked at mine at 82k miles. I didn't think to take photos.
I saw some build up on the valve stems at the mid point where the stem retracts into the head but nothing significant on the back side of the valves themselves. Actually the valve itself looked pretty darn good.
The build up on the stem the was soft and gooey.
I cleaned it off of course.
I have been thinking about it and I am not sure if it is actually a problem or what problem it could cause.
Now don't take this the wrong way. Your product looks very well engineered but due to possible warranty issues I'm not taking the chance of installing it. However, once the warranty period is up I may decide otherwise.
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Foosh (03-20-2018)
04-12-2018, 06:15 PM
#44
Burning Brakes
Thread Starter
I finally got the opportunity to drop by my local Chevrolet Dealer and ask Darrell, the "Service Director" if a catch can install will void my warranty. This was at Maher Chevrolet in St. Petersburg, FL. They're not one of the largest Corvette outlets by any means but in 2017 they were ranked 47th in Corvette sales.
His answer was an immediate and unequivocal, "No!" He went on to say that adding a catch can was not a modification that would in any way damage the engine. Those are close to his exact words, as he looked me right in the eye.
Will this change anyone's mind about the catch can/warranty issue? Probably not. But I found it interesting that he didn't even have to think about it.
His answer was an immediate and unequivocal, "No!" He went on to say that adding a catch can was not a modification that would in any way damage the engine. Those are close to his exact words, as he looked me right in the eye.
Will this change anyone's mind about the catch can/warranty issue? Probably not. But I found it interesting that he didn't even have to think about it.
04-12-2018, 11:00 PM
#45
Advanced
I too went to my dealer today. The Service Advisor hadn't heard of a catch can. They brought out a Corvette specialist. He knew about it. We discussed the function of the catch can and then went on to say he installed one on his truck. He also said I can perform a BG Induction Service since I have 15,253 miles on my LT1. After reading all the threads, I think I'm going to wait on installing the catch can. I use Mobil 1 and change the oil every 5,000 miles. If my car gets a little rough idle, I may do the induction service for $159.99 and call it a day.
04-12-2018, 11:14 PM
#46
I finally got the opportunity to drop by my local Chevrolet Dealer and ask Darrell, the "Service Director" if a catch can install will void my warranty. This was at Maher Chevrolet in St. Petersburg, FL. They're not one of the largest Corvette outlets by any means but in 2017 they were ranked 47th in Corvette sales.
His answer was an immediate and unequivocal, "No!" He went on to say that adding a catch can was not a modification that would in any way damage the engine. Those are close to his exact words, as he looked me right in the eye.
Will this change anyone's mind about the catch can/warranty issue? Probably not. But I found it interesting that he didn't even have to think about it.
His answer was an immediate and unequivocal, "No!" He went on to say that adding a catch can was not a modification that would in any way damage the engine. Those are close to his exact words, as he looked me right in the eye.
Will this change anyone's mind about the catch can/warranty issue? Probably not. But I found it interesting that he didn't even have to think about it.
Of course he didn't think about it, because he just popped off without thinking or truthfully representing how warranty decisions work.
A little advice for you . . . don't believe what some dealer employee tells you. Talk is cheap, and they work for independent businesses. They do not work for, or speak for, GM.
Come warranty claims time, GM makes the major decisions, and those independent business must get approval from GM for repairs if they expect to be reimbursed. His story would change very quickly if the question were asked under different circumstances.
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robertbruce (04-13-2018)
04-12-2018, 11:17 PM
#47
Le Mans Master
Since your statement above sent this thread down the path you claimed you weren't interested in going down, I'll say 3 last things:
1) There is no evidence that a catch can helps eliminate valve coking on the LT1 or LT4. Even if there were a valve coking problem, there's no evidence that catch cans eliminate the problem. The cause is not completely understood, except that top of valve washing doesn't occur as in port injection, BUT it's NOT a proven fact that it's caused by oil in the intake.
2) There is no evidence, yet, of valve coking issues on the LT1 or LT4. GM long-term testing has torn down engines well over that mileage, without seeing evidence of a valve coking problems hindering engine performance. We have a number of members here w/ engines at or over 100K miles without catch cans and without valve problems.
3) The dry sump system on the LT1/4 performs essentially the same functions as the Camaro system you referred to above, per an Ask Tadge answer on the subject.
To me, that's the "no-brainer" part. You probably aren't hurting a thing by adding one, but there's no evidence you're accomplishing anything positive either.
1) There is no evidence that a catch can helps eliminate valve coking on the LT1 or LT4. Even if there were a valve coking problem, there's no evidence that catch cans eliminate the problem. The cause is not completely understood, except that top of valve washing doesn't occur as in port injection, BUT it's NOT a proven fact that it's caused by oil in the intake.
2) There is no evidence, yet, of valve coking issues on the LT1 or LT4. GM long-term testing has torn down engines well over that mileage, without seeing evidence of a valve coking problems hindering engine performance. We have a number of members here w/ engines at or over 100K miles without catch cans and without valve problems.
3) The dry sump system on the LT1/4 performs essentially the same functions as the Camaro system you referred to above, per an Ask Tadge answer on the subject.
To me, that's the "no-brainer" part. You probably aren't hurting a thing by adding one, but there's no evidence you're accomplishing anything positive either.
And the second thing I know is since I installed a catch can my exhaust tips are no longer covered with black exhaust.
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David@MMS (04-13-2018)
04-13-2018, 12:31 AM
#48
Burning Brakes
Thread Starter
Of course he didn't think about it, because he just popped off without thinking or truthfully representing how warranty decisions work.
A little advice for you . . . don't believe what some dealer employee tells you. Talk is cheap, and they work for independent businesses. They do not work for, or speak for, GM.
Come warranty claims time, GM makes the major decisions, and those independent business must get approval from GM for repairs if they expect to be reimbursed. His story would change very quickly if the question were asked under different circumstances.
A little advice for you . . . don't believe what some dealer employee tells you. Talk is cheap, and they work for independent businesses. They do not work for, or speak for, GM.
Come warranty claims time, GM makes the major decisions, and those independent business must get approval from GM for repairs if they expect to be reimbursed. His story would change very quickly if the question were asked under different circumstances.