Straub Bushing Trunion Kits?
05-20-2016, 02:03 PM
#321
Just kidding.... I'm going to follow Chris's advice and squirt some assembly lube in the oil channel and work it in to assure that it doesn't start up dry.
themealonwheels - thanks for chasing this down for me while I was too busy to do it myself!
Chris - thanks for providing guidance on what we needed to do to avoid this issue.
themealonwheels - thanks for chasing this down for me while I was too busy to do it myself!
Chris - thanks for providing guidance on what we needed to do to avoid this issue.
05-21-2016, 01:24 AM
#322
I used assembly lube when I assembled mine and start-up was very quiet. No squealing or anything out of the ordinary. I have run them through 2 heat cycles and they are very quiet compared to the Comp trunnions that I removed.
05-21-2016, 11:07 AM
#323
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About to do a heads cam swap on my car in a few months. Building up parts and just ordered this kit with bolts after reading all the info on here. This made me decide not to get the Comp Cams kit.
05-22-2016, 06:16 PM
#325
Everyone that has removed the Comp trunnions for inspection showed galling damage. Be aware that you will need to press out a bearing to inspect the trunnion. It will not give any indication like noise, that the trunnion is being galled and it will feel smooth when it rolled. I saw mine because there were small metal particles collecting around the C-clips so I pulled them apart and they were gone; less then 10,000 miles.
05-22-2016, 06:23 PM
#326
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To me it seems to be more of a wear issue then a failure issue. It might not show any issues until you pull it back a part which a lot of people don't do. Most people just stick them in and forget.
05-22-2016, 06:27 PM
#327
TECH Senior Member
this indicates some incompatibility between the trunion material and/or heat treatment and the needles/rollers in the bearing (they seem to me to be very small in size).
05-22-2016, 08:55 PM
#328
As much as I wanted to add insight to my oil change this weekend from my 3hr drive to and from the armdrop event yesterday. Im fairly confident I ruined my fresh new lifters as the oil pushed past the cam sensor o ring and ran very low on oil from the highway pulls. here is a video from a few nights ago :
Then I made a light pass for fun taking it easy on the maxima beside me:
And then I went 3/4 tilt on the drive home with alot of cars from the event.My e-cutout got stuck open and I didnt hear the motor clacking till it was too late:
And now the end result is this bucket of bolts lol
But I think my trunions are holding up just fine
Then I made a light pass for fun taking it easy on the maxima beside me:
And then I went 3/4 tilt on the drive home with alot of cars from the event.My e-cutout got stuck open and I didnt hear the motor clacking till it was too late:
And now the end result is this bucket of bolts lol
But I think my trunions are holding up just fine
05-23-2016, 08:30 PM
#330
I surmise that the Comp trunions are not heat treated properly, I will test this when I get home (see if a file cuts the running surface, if the heat treatment is correct then it should not).
Also note that the OE needle/rollers are bigger than those in the Comp kit (bigger radius roller spreads load out a bit more).
Also note that the OE needle/rollers are bigger than those in the Comp kit (bigger radius roller spreads load out a bit more).
The rollers are picking up the soft metal and literally eating the bearing surfaces away. If you have these style trunions, I would check them out at 10k. You probably do not have to disassemble the bearing from the rocker as if they are worn, you will feel play.
05-23-2016, 08:48 PM
#331
TECH Senior Member
I had my Summit trunion checked today. It came it at almost exactly 40 Rc. I will know the material specs tomorrow. The finish on the bearing surface was 17.9 Ra. WAY too rough for a bearing surface. The hardness should be closer to 60 Rc to make it last. I will bet it is something like 4140 as that is about as hard as you can safely heat treat it.
The rollers are picking up the soft metal and literally eating the bearing surfaces away. If you have these style trunions, I would check them out at 10k. You probably do not have to disassemble the bearing from the rocker as if they are worn, you will feel play.
The rollers are picking up the soft metal and literally eating the bearing surfaces away. If you have these style trunions, I would check them out at 10k. You probably do not have to disassemble the bearing from the rocker as if they are worn, you will feel play.
05-24-2016, 07:27 PM
#332
Thanks for the offer! I do appreciate it!
05-29-2016, 07:42 PM
#333
Man 17 pages, forgive me for not reading it all before posting
I have the BTR trunions in a daily driver with a mild cam motion cam, btr duals, with TI retainers...
Should I be swapping these out ASAP for the bushings? Motor has been running fine, but this thread has made me worry. Can the BTR bolts be used with these bushings?
I have the BTR trunions in a daily driver with a mild cam motion cam, btr duals, with TI retainers...
Should I be swapping these out ASAP for the bushings? Motor has been running fine, but this thread has made me worry. Can the BTR bolts be used with these bushings?
Last edited by mchicia1; 05-29-2016 at 07:50 PM.
05-29-2016, 08:08 PM
#334
Man 17 pages, forgive me for not reading it all before posting
I have the BTR trunions in a daily driver with a mild cam motion cam, btr duals, with TI retainers...
Should I be swapping these out ASAP for the bushings? Motor has been running fine, but this thread has made me worry. Can the BTR bolts be used with these bushings?
I have the BTR trunions in a daily driver with a mild cam motion cam, btr duals, with TI retainers...
Should I be swapping these out ASAP for the bushings? Motor has been running fine, but this thread has made me worry. Can the BTR bolts be used with these bushings?
I'm confident you'll be fine. Do not switch
05-29-2016, 10:13 PM
#335
Interesting that Tooley has taken off the trunions from his site and put these bushings instead. If he isn't confident, than I'm not either.
Wish I just stayed with the stock rocker arms.
Wish I just stayed with the stock rocker arms.
05-29-2016, 11:23 PM
#336
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Great product so far.
No squeal at start up using assembly lube.
I pulled the comp trunions apart and found higher wear than expected for having less than 1,000 miles.
This one looked ok no real damage. About half looked like this.
The other half with damage almost this bad.
The motor is less noisy. Still a bit tickey but better.
No squeal at start up using assembly lube.
I pulled the comp trunions apart and found higher wear than expected for having less than 1,000 miles.
This one looked ok no real damage. About half looked like this.
The other half with damage almost this bad.
The motor is less noisy. Still a bit tickey but better.
05-30-2016, 12:05 AM
#337
TECH Senior Member
Is there any correlation of the bad ones to I/E or bank 1/2 or front/rear...?
Great product so far.
No squeal at start up using assembly lube.
I pulled the comp trunions apart and found higher wear than expected for having less than 1,000 miles.
This one looked ok no real damage. About half looked like this.
The other half with damage almost this bad.
The motor is less noisy. Still a bit tickey but better.
No squeal at start up using assembly lube.
I pulled the comp trunions apart and found higher wear than expected for having less than 1,000 miles.
This one looked ok no real damage. About half looked like this.
The other half with damage almost this bad.
The motor is less noisy. Still a bit tickey but better.
