Another Yella Terra failure (round 2)
Thread Starter
Melting Slicks
Joined: Jan 2009
Posts: 2,127
Likes: 33
From: Easley/Anderson South Carolina
Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
I just changed to oil out to see if that would help. I doubt I'd be able to capture the noise on video due to the exhaust being so loud. The ticking is really faint and I only hear it about 2K rpm. I'm wondering now if it isn't some piston slap. Took the car out today and after getting a mile down the road the ticking was gone. Parked the car at a car show for ~2 hours and did not hear it at all on the 2 mile ride back home. Maybe the new oil helped, idk. 
Just gonna have to drive it and see if it comes back or something actually breaks.
Just gonna have to drive it and see if it comes back or something actually breaks.
Team Owner
Joined: May 2001
Posts: 87,418
Likes: 1,598
From: Western NY
I just changed to oil out to see if that would help. I doubt I'd be able to capture the noise on video due to the exhaust being so loud. The ticking is really faint and I only hear it about 2K rpm. I'm wondering now if it isn't some piston slap. Took the car out today and after getting a mile down the road the ticking was gone. Parked the car at a car show for ~2 hours and did not hear it at all on the 2 mile ride back home. Maybe the new oil helped, idk. Just gonna have to drive it and see if it comes back or something actually breaks.
Just gonna have to drive it and see if it comes back or something actually breaks.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
My car ticked bad several years ago and it went away. I spoke to several including Terry Dyson. We think it was carbon build up on the pistons that was cause some rocking. Has never done it again since.
Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
Just curious, what kind of oil did you put in when you changed it? My '01 has had Mobil1 in it since day 1, except once, when I got 6 qts. of Pennzoil Platinum very inexpensively. Ran the Pennzoil for one summer of driving, and although I didn't do any scientific measuring, I swear the little "ticking" noises that the car normally makes went away. The following summer (last year), I had Mobil1 back in it, and the usual noises returned....
Last edited by Z06ufgrad2002; Jun 30, 2013 at 11:31 AM.
3rd Gear
Joined: Nov 2011
Posts: 3
Likes: 0
You hit the nail right on the head! People are too quick to blame a part. It is all about using the right combination and setting it up correctly. For the high open spring pressures and aggressive ramp rates, I use Yella Terra's Platinum series rockers and have had no issues. Great comment sabastian458!
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Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
How much did you shim? I have the same cam/heads and needed 0.125" shims to center the wipe pattern. Also, I found that 3/8" double taper pushrods straightened out some valve train instability I had with the straight 5/16" pushrods.
Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
That sux. I've got to pull mine apart again. My ticking noise is back again. I think I tore up a cam lobe or something. Car developed an intermittent miss the last time I drove it and the noise became much more consistent and a bit louder. Man it's been a crappy week!!
Thread Starter
Melting Slicks
Joined: Jan 2009
Posts: 2,127
Likes: 33
From: Easley/Anderson South Carolina
Yeah* those are the old style. Jim will take care of you, he has been a great guy.
I had to use the shims/washers provided and that centered my wipe. When I finish my new build I will run thicker pushrods too.
I had to use the shims/washers provided and that centered my wipe. When I finish my new build I will run thicker pushrods too.
Last edited by sabastian458; Oct 13, 2013 at 11:47 AM.
Pro
Joined: Nov 2002
Posts: 603
Likes: 20
From: Chicago area (Crook County) IL
I used the shims provided with the rockers, I didn't measure them but the wipe was centered when everything was assembled.
Safety Car
Joined: Aug 2011
Posts: 4,454
Likes: 412
From: Portland OR
Looks exactly like my failure, roughly the same miles, also AFR heads with the upgraded springs.
looking closely with a high power microscope, it was clear the end of the rocker had cracked first, then slowly cracked more and more until it finally failed completely. I was at 1500 rpm just putting down the street....luckily close to home.
The engine is real pissed off when the exh rocker busts! Holy cow, mine sounded like a rod was about to exit.....
Ron
looking closely with a high power microscope, it was clear the end of the rocker had cracked first, then slowly cracked more and more until it finally failed completely. I was at 1500 rpm just putting down the street....luckily close to home.
The engine is real pissed off when the exh rocker busts! Holy cow, mine sounded like a rod was about to exit.....
Ron
Last edited by RonSSNova; Oct 14, 2013 at 01:36 AM.
Safety Car
Joined: Apr 2007
Posts: 3,582
Likes: 137
From: SoCal CA
I never had an issue with the YTs in my LS6 but I didnt take a chance on my LS3 and went with Comp Cam updated stockers. Did them myself quite easily. Sorry for those who have had bad luck with these.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Looks exactly like my failure, roughly the same miles, also AFR heads with the upgraded springs.
looking closely with a high power microscope, it was clear the end of the rocker had cracked first, then slowly cracked more and more until it finally failed completely. I was at 1500 rpm just putting down the street....luckily close to home.
The engine is real pissed off when the exh rocker busts! Holy cow, mine sounded like a rod was about to exit.....
Ron
looking closely with a high power microscope, it was clear the end of the rocker had cracked first, then slowly cracked more and more until it finally failed completely. I was at 1500 rpm just putting down the street....luckily close to home.
The engine is real pissed off when the exh rocker busts! Holy cow, mine sounded like a rod was about to exit.....
Ron
I don't recall, did you replace with the new YT rockers (newest design)? If you did, any issues with valve train control?
I am thinking of upgrading to the new design in the spring even though I have not had any problems with mine to date.
Ounce of prevention approach
Pro
Joined: Nov 2002
Posts: 603
Likes: 20
From: Chicago area (Crook County) IL
Just wanted to give an update, Jim from Yella Terra sent me a whole new set of the revised version and car is up and running again. He was great through the whole ordeal, good to see a company stand behind their products!
Drifting
Joined: Feb 2005
Posts: 1,869
Likes: 61
From: montreal quebec
i can't say the same think about my dealing with them...i bought a set of the rockers a few years ago and no failure yet but do i really need to live with the what if!!...asked jim if they would swap out for a new set just to protect a 8000$ build and he said no way cause i don't have my bill anymore...what a great answer !!!! I'm supposed to hold on to every piece of paper forever!!! looking for a replacement set and i really don't think its gonna be from them...i wish they would really stand up and do something....nobody had and problem taking my money but now nobody wants to help