I haven't seen any reports of a C8 Z06 engine failure in a long time. This thread is over a year old at this point. There is about 10,000 of these cars on the road now. If there were widespread engine failures people would be talking about it.

 

Exactly why I think this thread should mirror the sticky thread in the C8 General Forum and just name it "C8 Z06 Problems".

 

OK - now have 330 miles. Sounds good cold but this when hot. Is this the dreaded Z06 ticking?

 

My suggestion, put more miles on it and have the Picoscan done. That will show graphic evidence of what your ears (and suspicion) can only guess at.

 

Good. Thanks for the recommendation. Will do.

 

Mine and a couple of others here sound like that. But mine is reversed, when it warms up it goes away, I don’t hear it when I’m driving and doesn’t affect the drivability. Everyone is different on their tolerance of what bothers them, it doesn’t bother me at all. I’d be more worried about a subpar dealer causing bigger issues than the mechanical noise of the LT6.

 

Thanks for the response. Interesting how its reversed!. I cannot hear the tapping while driving either. I note it when I stop and only with windows down or standing outside with it running. I am going to drive on and see what happens.

I do worry about a local small dealer tearing into it as a learning experience. However, I just had a C7 Z06 squawking pilot bearing replaced by same dealer. This repair was driveline disassembly from rear end to flywheel. They pulled it off without a hitch and the squawking is gone. So... maybe they have some skilled mechanics.

 

True
Very curious how the solid, non-adjustable valvetrain will hold up over time.

 

They claim at 100,000 miles it's still in spec. Time will tell, but with a 60,000 drivetrain warranty, they would be in a really bad place if all were shot by 50,000 miles.

 

Well, s---. I got the same noise. Just ~900 miles. Came back from a short drive up to Tortilla Flat on some nice twisties to get used to the car a little better after a very careful, fully compliant per the instructions in the manual 500 mile initial break-in. Still getting the "feel" of the car, so I wasn't really pushing it - not at all - like I said, still getting familiar with what the car can do. Got home, noticed tihe noise, re-read the germane bits in this thread, listened again to the motor with a stethescope (yeah, that's it, that's the infamous ticking), and immediately made an appointment with the dealer to check it out. Apt is tomorrow morning. Note the engine builder's signature......

Not excited at all if the motor has to come out for "remediation", especially if this dealer has to do it, haven't had the best luck with this particular dealer with my truck and my '08 Z06 since they changed ownership. Don't want some not so skilled "technician" learning on my new Z, especially if it was the guy who did the dealer prep work on my truck (long story.....).

Maybe we can have Jason fly out to do the work ?

Note: I'm not implying in any way that Jason Neal did something wrong in the assembly. I'm sure he knows how to build an LT6. Just (sarcastically) don't want some inexperienced technician "learning" on my $150K+ car if it needs serious work.



N

 

Solid, non-adjustable 9k rpm valvetrain Not sure how this is gonna work out long term

 

I honestly think it's characteristic of this engine. Even the TSB says it may only be a marginal improvement. I.E. it's just how they are. You've got a direct injection system (that are loud ticking systems to begin with) and the LT6 runs up to 5,000PSI + vs. 2,900 in LT2. The increased pressure will make them tick even louder. The other thing to think about is this, if it was fine when it was zero miles, and now in only 500 miles it's doing damage, why open it up? If it's truly got a problem then the damage is done, they don't squirt a tube of Self Heal into the engine. The only thing the TSB does is reseat some cam caps. When mine is hot and being driven slowly through my neighborhood, it makes all kinds of sounds. I won't be doing anything with it because nothing will be accomplished. I look forward to driving mine every chance I get, don't over think this, it's not made by Singer.

 

I dare say there aren't too many dealer mechanics who have experience working on the LT6 and this was my concern as well when the left bank had come apart for the TSB.
Unfortunately, This will change.

 

This is exactly the results of my TSB repair, left bank, cam cap resets. A marginal improvement (reduction) in tapping sound, about 600 mi ago, which seems to be increasing again, or it may just be my imagination. Either way, I'm going back for a PICOSCAN to have it evaluated.
I'm ok with noisy as long as it's not destructive noisy.

 

Now over 600. Ticking still there. I am just going to drive on. If it self destructs, GM will owe me a new motor. I also have a 62 340 HP with solid lifters. I treat that racket as the music of high performance. Will do same here. I have read the service bulletin. It only loosens the brackets one turn and re-seats. That is not a very positive action by any interpretation. Not worth the risk of messing with major disassembly

 

Like others have said, these engines make noise. No where have I read that if the valve train is making that it is doing any damage and as the last post says they have a nice long warranty on the engine if this turns out not to be the case. I drive my Z06 all over and never give it a thought because I'm not listening for ticks I'm listening for the ROAR from the exhaust which is music to my ears especially in Z mode where you get that wonderful burbling sound from decel!

 

I agree. Open sound programmed into my mode. It is glorious

 

Yeah, well if it's a characteristic of the motor, I want the dealer/Chevrolet to tell me that - on record. I also want a record that I identified and presented the issue to the dealer. I get the thing about the injectors, especially on a DI engine, but my Chevrolet Truck (6.2) is also DI, so I know the sound. As I mentioned above, I ran a stethoscope all over what I could reach on the motor and I can identify and tell the difference between the injectors ticking and what I can hear in the top end on the back left side of the motor. But I'm in violent agreement with you about not opening it up, or not letting a questionably qualified technician open it up if it's not doing any damage/characteristic of the motor. I'll just drive it the way it's designed to drive, track and all.

Yep. I'm in your space.

Agreed, as long as it's not doing any damage.

God, I love this car, and the music it makes is glorious! The more I drive it, the more I want to drive it. Here's the thing, I started my working life as a mechanic back in the days when we did everything on any car in the shop, front ends, transmissions, rear ends, engines, everything. Been a gearhead my whole life and have hot rodded, owne, and driven all kinds of machines. I listen to EVERYTHING, and my OCD compels me to identify and fix (if it's "fixable") everything I hear, see, or feel. Listening to the sounds and sensations from a high-performance machine, visualizing all the stuff that's going on in there, appreciating what it's function is and how well it's doing it's thing, all part of the experience and enjoyment, especially something as sophisticated as a LT6 Z06.

Anyway, thanks to all y'all for your comments and observations. That's the great thing about this forum. we can talk about this stuff and kick it around a little. I appreciate all your comments. Thanks again! I'll let y'all know how things get on.

 

You can add me to the list of engine failures. VIN 652. Engine was starting rough in November. In December one day it wouldn’t turn over. Had it towed to the dealership, they tore it down, claimed there was scoring in multiple cylinders, and replaced the whole engine (took until March). Got the car back and within a week the transmission was throwing temperature warnings in 50 degree weather driving 35 min on a local highway. Now waiting for a new transmission.

My Z has been in the shop for almost 6 months now. Was around 9k miles on it when the engine failed.

 

Ouch! Sorry to hear this. Hope it works out for you.