New YT rocker failure
4517 miles today on my YT gen III.
171 Closed Pressure.
429 Open Pressure.
7400 rpm daily.
Springs have been just checked and are right on the money.
By the picture below and watching them under all angles the Yella Terra Ultralite Gen III are still same as when I bought them in December 2012.
Christian
171 Closed Pressure.
429 Open Pressure.
7400 rpm daily.
Springs have been just checked and are right on the money.
By the picture below and watching them under all angles the Yella Terra Ultralite Gen III are still same as when I bought them in December 2012.
Christian
Last edited by miami993c297; Jun 12, 2014 at 08:00 PM. Reason: Date of aquisition corrected...
Thread Starter
Joined: Aug 2011
Posts: 4,731
Likes: 815
From: Portland, OR
It will be interesting to see what YT Australia thinks is the issue. You're lucky you caught it. If it kept wearing it might have pushed on the retainer enough to free the locks and then you might have dropped a valve.
Thread Starter
Joined: Aug 2011
Posts: 4,731
Likes: 815
From: Portland, OR
Thread Starter
Joined: Aug 2011
Posts: 4,731
Likes: 815
From: Portland, OR
Hey all,
I'd like to take the opportunity to thank the folks at Yella Terra for taking care of my issue.
I'd also like to say that my intention with this post was to only find out if I was the only one who has seen this particular issue. It wasn't to stir controversy over their product. I see now that I could have used better judgment in posting.
Ron
I'd like to take the opportunity to thank the folks at Yella Terra for taking care of my issue.
I'd also like to say that my intention with this post was to only find out if I was the only one who has seen this particular issue. It wasn't to stir controversy over their product. I see now that I could have used better judgment in posting.
Ron
Hey all,
I'd like to take the opportunity to thank the folks at Yella Terra for taking care of my issue.
I'd also like to say that my intention with this post was to only find out if I was the only one who has seen this particular issue. It wasn't to stir controversy over their product. I see now that I could have used better judgment in posting.
Ron
I'd like to take the opportunity to thank the folks at Yella Terra for taking care of my issue.
I'd also like to say that my intention with this post was to only find out if I was the only one who has seen this particular issue. It wasn't to stir controversy over their product. I see now that I could have used better judgment in posting.
Ron
Yella Terra has an amazing customer service in term of response. The technical level and the engineer understanding is way above the norm...plus they want their products to work.
Any return from them on what could be the causes of your damage rocker yet?
Christian
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Verdad Gallardo Ron,
Did they think this was an issue particular to your installation? Also, did you have any warning signs at all so we all know what to listen for? It almost sounded from your original post that you found these by accident since you were simply sealing the rocker bolts so the motor wouldn't ingest oil.
Did they think this was an issue particular to your installation? Also, did you have any warning signs at all so we all know what to listen for? It almost sounded from your original post that you found these by accident since you were simply sealing the rocker bolts so the motor wouldn't ingest oil.
Looks like you made a good catch, early enough to prevent getting a bunch of metal floating around the engine. I put YT rockers in my C5 back at 155k miles and it's got 311k miles now. Like you, I added them hoping to reduce valve guide wear since I put so many miles on the car.
I would be interested to hear YT's failure analysis.
I would be interested to hear YT's failure analysis.
Looks like you made a good catch, early enough to prevent getting a bunch of metal floating around the engine. I put YT rockers in my C5 back at 155k miles and it's got 311k miles now. Like you, I added them hoping to reduce valve guide wear since I put so many miles on the car.
I would be interested to hear YT's failure analysis.
I would be interested to hear YT's failure analysis.
What cam specs and spring pressures are you running? Were/are they as effective at reducing valve guide wear as you hoped they would be? Have you had any failures?
I have had zero rocker arm failures after running 156,000 miles on the YT's in my '99 LS1. Over that time I've used 2 sets of Patriot Gold springs and on my second set of BTR dual springs (no breaks, just preventive replacements). I've also had three different cams - 224°/230° and two with low/mid 230° duration and just under .600" lift. I have experienced 2 cam lobe failures - the first after 95k miles and the second after 60k miles.
Back in January I replaced the cam and springs and had the AFR heads off. Valve guides looked fine so I cleaned them up and threw them back on. I bought these heads used so I don't know exactly how many miles they have, but I do know I've put the same 156,000 miles on the heads and rocker arms.
Back in January I replaced the cam and springs and had the AFR heads off. Valve guides looked fine so I cleaned them up and threw them back on. I bought these heads used so I don't know exactly how many miles they have, but I do know I've put the same 156,000 miles on the heads and rocker arms.
I used the scorpions without issue. The ONLY reason I swapped them out was going a completely different route with the motor.
After 8000 miles on XE-R lobes they looked and operated perfectly.
Glad you got it sorted.
After 8000 miles on XE-R lobes they looked and operated perfectly.
Glad you got it sorted.
Staging Lane
Joined: Jun 2013
Posts: 90
Likes: 39
I have had 4 or 5 YT6645 rockers break but that's out of probably about 300+ sets so not really too bad and who knows what all really happened to those rockers?
I've seen more failures with the Jesel Sportsmans due to bad installation with the bolts grinding into them at full lift or them binding and breaking back at the pushrod cup like all the rockers can.
Seen the most failures with OEM rockers with different severe wear problems or lost trunions but again who knows what they went through so I take it all with a grain of salt?
A lot of problems come from out of control valvetrain systems where crazy lobes and heavy parts are thrown together with wrong springs or incorrect spring setup etc. even coil bind. I've seen it all.
Now out of 20 sets of Scorpions we used back in the day 11 sets had a rocker let go and they were just like all the other failures where the pushrod cup area broke off. Back then that was just a ridiculous failure rate so had to pass on them.
The sad thing was the Scorpions had almost perfect geometry bolted straight on stock heads for .600-ish lift and were very light but maybe too light. I guess maybe they redesigned them back in that area so they are more robust now?
I've seen more failures with the Jesel Sportsmans due to bad installation with the bolts grinding into them at full lift or them binding and breaking back at the pushrod cup like all the rockers can.
Seen the most failures with OEM rockers with different severe wear problems or lost trunions but again who knows what they went through so I take it all with a grain of salt?
A lot of problems come from out of control valvetrain systems where crazy lobes and heavy parts are thrown together with wrong springs or incorrect spring setup etc. even coil bind. I've seen it all.
Now out of 20 sets of Scorpions we used back in the day 11 sets had a rocker let go and they were just like all the other failures where the pushrod cup area broke off. Back then that was just a ridiculous failure rate so had to pass on them.
The sad thing was the Scorpions had almost perfect geometry bolted straight on stock heads for .600-ish lift and were very light but maybe too light. I guess maybe they redesigned them back in that area so they are more robust now?