Another Yella Terra failure (round 2)
Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
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
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I do plan on replacing mine with the newer version in the spring. I look at this another way. I have gotten five years out of mine and for $400 am not willing to risk the motor. Also, I spent a lot of time setting up the valve train with a perfect geometry and custom double taper pushrods. The new YT's are a drop in vs. a different set of rockers that are a do over and potentially new pushrods as well. Just shop the sales over the winter and spring. 
Melting Slicks
Joined: Sep 2003
Posts: 2,062
Likes: 117
I do plan on replacing mine with the newer version in the spring. I look at this another way. I have gotten five years out of mine and for $400 am not willing to risk the motor. Also, I spent a lot of time setting up the valve train with a perfect geometry and custom double taper pushrods. The new YT's are a drop in vs. a different set of rockers that are a do over and potentially new pushrods as well. Just shop the sales over the winter and spring.
Christian
Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
I do plan on replacing mine with the newer version in the spring. I look at this another way. I have gotten five years out of mine and for $400 am not willing to risk the motor. Also, I spent a lot of time setting up the valve train with a perfect geometry and custom double taper pushrods. The new YT's are a drop in vs. a different set of rockers that are a do over and potentially new pushrods as well. Just shop the sales over the winter and spring.
I am going to look into the OE upgrade also. I need to do something during the upcoming engine rebuild IF YT doesn't step up and replace them with the newest version. I don't want to lose a brand new engine over the $400 part that is known to fail. That would be 
Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
I sent YT an email ~ 2 weeks ago and another a month prior to that and no response from them to either message. I have a hard time giving more money to a company that can't follow up with customers over a known quality issue with their product. 
Melting Slicks
Joined: Sep 2003
Posts: 2,062
Likes: 117
I have to admit jumping to the YT for my engine was kind of big deal...after so many issue with their Gen 2...
I have in archive no less than 18 emails back and forth with Jim the owner of Yella Terra from Australia.
Jim was always courteous, always patient, answering in many details my incessant questions...he sent me after a week of literature on the web to Roger Vinci his collaborator in Florida...and I went even more ballistic with my questions and request...
Roger as well guide me through the all development of the YT Gen 3 and how to set them up for my application...
All that time and energy those two company spent with me was to sell a ~$400 deal...how gentleman they were as I can't imagine they made any profit on me!
I deeply recommend this Yella Terra company and its collaborators in USA, plus their YT Ultralite are still running every time I drive the car to 7250 rpm without a miss!!!
Christian
I have in archive no less than 18 emails back and forth with Jim the owner of Yella Terra from Australia.
Jim was always courteous, always patient, answering in many details my incessant questions...he sent me after a week of literature on the web to Roger Vinci his collaborator in Florida...and I went even more ballistic with my questions and request...
Roger as well guide me through the all development of the YT Gen 3 and how to set them up for my application...
All that time and energy those two company spent with me was to sell a ~$400 deal...how gentleman they were as I can't imagine they made any profit on me!
I deeply recommend this Yella Terra company and its collaborators in USA, plus their YT Ultralite are still running every time I drive the car to 7250 rpm without a miss!!!
Christian
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Roger got back to me as well with answers to some questions I posted to the tech line of the Australian web site. My concern was whether the new design was a geometric one for one swap, i.e., I didn't need to set up the wipe and then the pushrod length again as I spent a good deal of time doing this the first time around. Since they are a one for one swap, the replacement should be fairly straight forward.
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Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
A little more food for thought. I found this after pulling the heads and rocker arms. I found these marks at both #1 and #8 cylinders. It certainly appears the YT rocker arms were rubbing against the head and created these wear patterns.
Last edited by Z06ufgrad2002; Nov 13, 2013 at 06:52 PM.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Just got the opportunity to upload from home computer. Here are my 241's after I cleaned them up for storage. Note the machined cuts are at each cylinder. These heads have never used YT rockers.
Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
That's really odd. Mine definitely do not have the marks above every valve.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
There are actually marks above the intake valve of cylinder 3 and there are small marks above the entire passenger side head that get lighter as you move towards the front of the engine. The marks above # 8 are as pictured above. Very strange!!
Safety Car
Joined: Nov 2002
Posts: 4,394
Likes: 6
From: Melbourne FL
i just installed a set and man i had to clearance the valve cover and heads. also i marked the rockers with dykem blue and ran the motor looking for contact marks non were found. also i marked the valve stem spun the motor over and checked the contact pattern on the valve , it was centered perfectly. no issues yet. but the are aluminuim and should be replaced after a full race season or 2 yrs. prw makes steel ls3 rockers, but they are still in testing.
Melting Slicks
Joined: Sep 2003
Posts: 2,062
Likes: 117
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
I wonder if these strange "marks" are witness-marks left by a holding jig (or fixture), during the original manufacturing/machining process.
Le Mans Master
Joined: Mar 2002
Posts: 5,955
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From: PNW
