Comp trunion upgrade failure (Check yours)
01-06-2013, 03:54 PM
#85
Similar issue, if not as pronounced. I'm running more cam/spring/rpm so that follows the pattern. The more I dig into this issue, the less I think its an oiling problem (in all cases, not just my own). I will be getting mine bushed by CHE, the bushings have almost twice the surface area as the bearings do, and are far more robust. Nothing to wear as bronze is self lubricating.
01-07-2013, 05:30 AM
#89
yep
It was a oiling issue. Everything was wet made 40 at idle reved up 70 or a little more. I thought for sure the lifters were dead then I found some trunion material shavings arounrd the clips.
new trunions and o ring lots of miles the rest of the summer and they have been fine.
Tim
It was a oiling issue. Everything was wet made 40 at idle reved up 70 or a little more. I thought for sure the lifters were dead then I found some trunion material shavings arounrd the clips.
new trunions and o ring lots of miles the rest of the summer and they have been fine.
Tim
01-07-2013, 12:28 PM
#90
Similar issue, if not as pronounced. I'm running more cam/spring/rpm so that follows the pattern. The more I dig into this issue, the less I think its an oiling problem (in all cases, not just my own). I will be getting mine bushed by CHE, the bushings have almost twice the surface area as the bearings do, and are far more robust. Nothing to wear as bronze is self lubricating.
So far, all the reported cases appear that needle bearing is harder and trunion race area shown the localized damage.
Bronze is softer than steel in needle bearing and trunion. Bronze in CHE does not rotate, unable to spreading out the "wear", as individual needle bearing, having the possibility to rotate, within outer race, as bushing is pressed fitted then machined. All the pivoting bronze bearing will be subjecting to will have wear and will be localize in an small arc, as on the damaged trunions shown. Being it is the softest material in the assembly - how much wear, will be the question.
It is true that bronze is often used as bearing material in selected application. So is "Oilite Bronze", which is truly self lubricating type, as it is manufactured with impregnated oil within the pores - I wonder what type/grade CHE is using - all they say their bronze is special!
01-08-2013, 02:26 PM
#95
01-08-2013, 03:55 PM
#96
On corvette forum!
Edit: I misread. I see you use CHE bronze GUIDES, not rocker bushes. My mistake. I fixed the above post.
(http://forums.corvetteforum.com/c6-z...-valves-7.html)
Edit: I misread. I see you use CHE bronze GUIDES, not rocker bushes. My mistake. I fixed the above post.
(http://forums.corvetteforum.com/c6-z...-valves-7.html)
01-17-2013, 07:55 PM
#100
from: Ryan Hart <rhart@compcams.com>
to: CB <xxxxxxx>
Hi Chris, just a quick question. How long have you been running these rockers? I was just looking at the pictures you sent in. They look like normal wear and your lobes are pretty stout. I was just thinking if it has been a while since you last built them then it may be just normal wear. If you still want to send them in for a check, that’s fine. I will send you the RMA number.
I'm flabbergasted at the notion. Normal wear... lol. Comp REALLY believes in their product, NOT.
to: CB <xxxxxxx>
Hi Chris, just a quick question. How long have you been running these rockers? I was just looking at the pictures you sent in. They look like normal wear and your lobes are pretty stout. I was just thinking if it has been a while since you last built them then it may be just normal wear. If you still want to send them in for a check, that’s fine. I will send you the RMA number.
I'm flabbergasted at the notion. Normal wear... lol. Comp REALLY believes in their product, NOT.