Another YT breakage
10-21-2012, 08:04 AM
#1
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Another YT breakage Lookie what I found today when I opened up my valvecover.
I'm up for suggestions on what rocket to get next. I know I should get Jesel's or TD's but don't have more then a grand laying around right now for rockers. Heads are AFR's with bronze valve guides so stock upgraded rockers are probably out for now also.
In case someone asks what the spring pressure was, I'm not exactly sure. Installed height is @1.775 with AFR 8019 springs. The specs at 1.81 are #155 and 1.210 is #412 so I figure around #450 give or take for my open pressure. Cam is a HUC lobe 624/632 lift.
I'm up for suggestions on what rocket to get next. I know I should get Jesel's or TD's but don't have more then a grand laying around right now for rockers. Heads are AFR's with bronze valve guides so stock upgraded rockers are probably out for now also.
In case someone asks what the spring pressure was, I'm not exactly sure. Installed height is @1.775 with AFR 8019 springs. The specs at 1.81 are #155 and 1.210 is #412 so I figure around #450 give or take for my open pressure. Cam is a HUC lobe 624/632 lift.
10-21-2012, 10:32 AM
#2
I'd say Jessels are about the only option unless you want to buy just one YT to replace the broken one until you can save up for the jessels......just remember shrapnel from a broken rocker can end up in pretty bad places and cost you your motor 
10-21-2012, 10:43 AM
#3
Ouch....ahhh yea, those are the old design YT rockers...they have since been Re-designed with more material to help prevent that. You can tell by how the "1.7" is stamped in the center of the rocker, the newer design has the "1.7" stamped off center
10-21-2012, 03:11 PM
#5
Probably more than a few folks with spares from broken sets lying around.....in fact I have a couple. Same head spring setup as you, but only .600" lift.
How many miles before it broke?
BTW...broke right where they added material.
Might want to contact them.
From the Vette forum
http://forums.corvetteforum.com/c5-t...round-2-a.html
Ron
How many miles before it broke?
BTW...broke right where they added material.
Might want to contact them.
From the Vette forum
http://forums.corvetteforum.com/c5-t...round-2-a.html
Ron
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10-21-2012, 08:34 PM
#8
Someone correct me if I'm wrong but doesn't YT only warrant them up to 420# open pressure? I mean, this absolutely sucks but YT REALLY needs to let folks know this up front before they buy them. I know if I spent that on rockers and one broke I'd be "at the front door waiting for the doors to open" pissed.
I feel for you, OP
I feel for you, OP
10-22-2012, 03:13 PM
#11
Got to admit I am getting more nervous with each of these I read about. I am running AFR's with a 0.125" shim and perfectly centered wipe pattern. My lift is less than yours at 0.588" but I also only have 5K miles on the setup.
One difference though, I went with much stiffer 3/8 double tapered pushrods and found out that I had flex in the pushrods that was showing in the upper RPM. Not sure if this was a contributor in your case, but with more lift I would suspect you have a similar situation. I made this change 1,500 miles after installing the H/C with the YT's.
One difference though, I went with much stiffer 3/8 double tapered pushrods and found out that I had flex in the pushrods that was showing in the upper RPM. Not sure if this was a contributor in your case, but with more lift I would suspect you have a similar situation. I made this change 1,500 miles after installing the H/C with the YT's.
10-22-2012, 04:19 PM
#12
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I'm running some Manton 11/32. How much open pressure you at?
Got to admit I am getting more nervous with each of these I read about. I am running AFR's with a 0.125" shim and perfectly centered wipe pattern. My lift is less than yours at 0.588" but I also only have 5K miles on the setup.
One difference though, I went with much stiffer 3/8 double tapered pushrods and found out that I had flex in the pushrods that was showing in the upper RPM. Not sure if this was a contributor in your case, but with more lift I would suspect you have a similar situation. I made this change 1,500 miles after installing the H/C with the YT's.
One difference though, I went with much stiffer 3/8 double tapered pushrods and found out that I had flex in the pushrods that was showing in the upper RPM. Not sure if this was a contributor in your case, but with more lift I would suspect you have a similar situation. I made this change 1,500 miles after installing the H/C with the YT's.
10-22-2012, 07:35 PM
#15
Mine are set at 1.810 with .600 lift.
However, seeings how I have been drag racing the car, have 40+ passes on it now, I wonder.
I can only imagine what could happen if one breaks at 6600.........
So looking at the Jessels, big $$$, and you have to hack up the valve covers and remove the baffles which will just cause other issues. Unless someone makes a spacer that allows the covers to be unmolested.
Arrrgh.....
Ron
However, seeings how I have been drag racing the car, have 40+ passes on it now, I wonder.
I can only imagine what could happen if one breaks at 6600.........
So looking at the Jessels, big $$$, and you have to hack up the valve covers and remove the baffles which will just cause other issues. Unless someone makes a spacer that allows the covers to be unmolested.
Arrrgh.....
Ron
10-22-2012, 08:57 PM
#16
Mine are set at 1.810 with .600 lift.
However, seeings how I have been drag racing the car, have 40+ passes on it now, I wonder.
I can only imagine what could happen if one breaks at 6600.........
So looking at the Jessels, big $$$, and you have to hack up the valve covers and remove the baffles which will just cause other issues. Unless someone makes a spacer that allows the covers to be unmolested.
Arrrgh.....
Ron
However, seeings how I have been drag racing the car, have 40+ passes on it now, I wonder.
I can only imagine what could happen if one breaks at 6600.........
So looking at the Jessels, big $$$, and you have to hack up the valve covers and remove the baffles which will just cause other issues. Unless someone makes a spacer that allows the covers to be unmolested.
Arrrgh.....
Ron
http://www.tickperformance.com/umi-1...cover-spacers/
10-23-2012, 03:42 AM
#17
You may want to contact Jim at YT directly, someone posted they will warranty the rockers and replace with the new stronger design recently released. It is in the thread that is linked above by RonSSNova.
I would personally hate to go to a different rocker since new pushrods would likely be required which is a large expense as well. There were also some posts on lift limitations of the Jesel rockers which I believe you exceed so be careful moving to them without checking into this issue.
I would personally hate to go to a different rocker since new pushrods would likely be required which is a large expense as well. There were also some posts on lift limitations of the Jesel rockers which I believe you exceed so be careful moving to them without checking into this issue.
10-23-2012, 07:04 AM
#18
We're they the new improved series Y/T Martin or the old series ?
10-23-2012, 08:56 AM
#19
I just don't understand why people are still willing to use these rockers considering all of the failures. When you think about it, the general public is being used as R&D for their company...only after a failure do they change the design. I guess that's better than doing nothing at all, but we're talking about a few hundred dollars worth of parts that can cause thousands in damage if the design isn't up to par, and so far, it hasn't been.
10-23-2012, 01:05 PM
#20
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I just don't understand why people are still willing to use these rockers considering all of the failures. When you think about it, the general public is being used as R&D for their company...only after a failure do they change the design. I guess that's better than doing nothing at all, but we're talking about a few hundred dollars worth of parts that can cause thousands in damage if the design isn't up to par, and so far, it hasn't been.