Straub Bushing Trunion Kits?
Here's another thought, because to be honest these look starved for oil just like spun bearings? How is the cars oil pressure? Are restricted push rods being used? Also, even with the oiling flats, if the bushing were sunk to deep, would oil get to the bushing?
After looking at more pics of the old style vs new, it is clear the old style directed the oil to the bushing. The new style allows oil to get to the bushing but it does not direct it there. The old style also looks like it would fight deflection better with the two oil channels vs the big gap of the new style.
Is this an attempt to catch an attitude? I'm only stating what I found and you clearly knew what I meant. So, if you feel superior good for you. .003 would be very tight especially with any type of expansion from heat. Was this spec recommended to you? Yes, I'm saying I think you set the bushings too deep.
As far as the bushings being set too deep, that is not the case.
Root cause has been determined and will be released in a few days.
PR are comp 5/16 .080 wall
After looking at more pics of the old style vs new, it is clear the old style directed the oil to the bushing. The new style allows oil to get to the bushing but it does not direct it there. The old style also looks like it would fight deflection better with the two oil channels vs the big gap of the new style.
Just plain ol btr 660 springs, with a .050 shim intake and .010 exhaust.
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Joined: Mar 2007
Posts: 1,149
Likes: 60
From: Saskatchewan, Canada - where arguing "DA" is for the slow and weak...
Galling typically happens from dry start, that could happen on install or if something sits long periods. They should still get oil with either design, but I think the first design interfered with stock bolts. Even sinking the bushings won't cut oil flow as the flat extends under the bolt.
Kurt
Kurt
I don't see why machining the top flat for the bolt necessitated changing the oil channel for the bushing. I can see where it made the machining process easier for the whole trunion shaft, but not necessary. I wish I had bought some before they changed the design. Now I think I'll just keep my stock ones. Seems to me that as long as the stock ones stay intact and don't spill their bearings there is nothing wrong with them.
TECH Fanatic
Joined: Jul 2007
Posts: 1,802
Likes: 333
From: Wilmington, De
I don't see why machining the top flat for the bolt necessitated changing the oil channel for the bushing. I can see where it made the machining process easier for the whole trunion shaft, but not necessary. I wish I had bought some before they changed the design. Now I think I'll just keep my stock ones. Seems to me that as long as the stock ones stay intact and don't spill their bearings there is nothing wrong with them.
I'd like to see pics of others with no problems after running the second design. I believe so far all the other no problem after running pics have been of the first design.
The stock ones are great if your lift does not exceed the travel of the cap. The bearings normally come out when run into valve toss. I have a set on my truck that are at 170,000 miles, but its had valve springs 3 times.
Kurt
Kurt
I don't see why machining the top flat for the bolt necessitated changing the oil channel for the bushing. I can see where it made the machining process easier for the whole trunion shaft, but not necessary. I wish I had bought some before they changed the design. Now I think I'll just keep my stock ones. Seems to me that as long as the stock ones stay intact and don't spill their bearings there is nothing wrong with them.
Joined: Mar 2007
Posts: 1,149
Likes: 60
From: Saskatchewan, Canada - where arguing "DA" is for the slow and weak...
I do find humour in anyone seeking to find fault in a budget part when it fails, especially when they lay claim to enough "expertise" to quote very specific material specs, principles, and assembly tolerances. I know that if I had access to those resources I wouldn't be messing around with modified stock junk, and then get upset when it doesn't perform up to my expectations. But, that is just me.
I don't see why machining the top flat for the bolt necessitated changing the oil channel for the bushing. I can see where it made the machining process easier for the whole trunion shaft, but not necessary. I wish I had bought some before they changed the design. Now I think I'll just keep my stock ones. Seems to me that as long as the stock ones stay intact and don't spill their bearings there is nothing wrong with them.
I say this as I agree that it does not seem that the oiling design had to change to make the bolts work.
I've got a beater 4.8(236K miles and literally runs GREAT with 40PSI+ hot idle) truck now and a set each of the new bush, old bush, Comp roller, Harland Sharp roller and I am pulling a handful from each. I'll install these on the truck this weekend-ish and I'll watch them grow old with the truck and planned upgrades, each set rocking two cylinders.