Straub Bushing Trunion Kits?
Teching In
Joined: Sep 2015
Posts: 38
Likes: 0
Just wanted to say thanks for a great product. Finished my install the other day and aside from the assembly grease I also waited to add my engine oil till the very last moment. I poured some oil on the rockers just before installing the valve cover and coil packs, started it up and all was quiet. The combo of these trunnions, my lifter upgrade, and cammotion cam and you'd swear I was driving a minivan from the sound off the motor. The exhaust is the only thing that lets you know that somethings going on under the hood.
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
My guess is the trunions are all made by the same company. BTR buys from Comp as well as Summit. They just rebrand them under their name. I know Summit does this al the time. The BTR cam is a Comp cam, so they probably have a relationship with each.
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
I believe that the trunnions are far too soft when compared to the needle bearings. I don't understand why the trunnions are so poor in quality, but everyone that installs them are at risk of engine damage and it's a big problem. They should be using a very high quality Timken Steel for the trunnions.
So, are the Straub trunions the answer? I used bushed rockers with my old Mopars and had no issue but those were pressure fed oil. Will the Straubs survive longer than the Comp-BTR-Summit trunion replacements.
The bronze being used is an impregnated alloy built for this type of application. I have 6 sets in some school cars and when the first one come down for inspection it will have had 25K hard miles put on it.
We have not reinvented the wheel here, we have gone with alloys that are proven in the field and used by OEM's. As you have pointed out shaft rockers with bronze alloys have been used for decades. Our design with the milled oil channel keeps constant oil fed to the bronze bushing. When the engine is not running or stored for a long period of time the oil is captured in the channel and will prevent any dry start ups.
We are over 2500 sets shipped on 4 continents now.
I posted about my stock bolts needing to be slightly forced down through the trunion during initial install.Nobody seem to have caught that earlier on in this thread.That wasnt a major concern for me though so I moved on.I got bigger problems to fix now lol.
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As I have stated, all of these are going to fail at some time. The advantage over the bushing is that when in failure mode it won't spit out needle bearings that could find it way to the oil pump and cause catastrophic failure.
The bronze being used is an impregnated alloy built for this type of application. I have 6 sets in some school cars and when the first one come down for inspection it will have had 25K hard miles put on it.
We have not reinvented the wheel here, we have gone with alloys that are proven in the field and used by OEM's. As you have pointed out shaft rockers with bronze alloys have been used for decades. Our design with the milled oil channel keeps constant oil fed to the bronze bushing. When the engine is not running or stored for a long period of time the oil is captured in the channel and will prevent any dry start ups.
We are over 2500 sets shipped on 4 continents now.
The bronze being used is an impregnated alloy built for this type of application. I have 6 sets in some school cars and when the first one come down for inspection it will have had 25K hard miles put on it.
We have not reinvented the wheel here, we have gone with alloys that are proven in the field and used by OEM's. As you have pointed out shaft rockers with bronze alloys have been used for decades. Our design with the milled oil channel keeps constant oil fed to the bronze bushing. When the engine is not running or stored for a long period of time the oil is captured in the channel and will prevent any dry start ups.
We are over 2500 sets shipped on 4 continents now.
I don't want to ASSuME anything. I do know experience is worth more than anything. Base on experience we used materials, heat treat, and finishes that have been used for decades. I have no reason to think that it won't. Again I want to stress, all of you have modified your cars beyond OEM limits. It is not a question of if it is going to fail but when. With the bushing trunnions in failure mode they will save you from catastrophic failure. Just like bushing lifters.
Joined: Mar 2007
Posts: 1,149
Likes: 60
From: Saskatchewan, Canada - where arguing "DA" is for the slow and weak...
Big thanks to Chris for a taking a few minutes to answer my questions about the kit and helping place the order. Looking forward to running these in the wagon.
Guys longevity for these is like asking how long valve springs last... it's one of those items that you should check maybe once a year, maybe every other year, it all depends on how hard you drive, and how many miles you put on your car.
Pull the valve covers, pull a rocker, pull a spring, do some basic checks every so often before it becomes a problem.
Pull the valve covers, pull a rocker, pull a spring, do some basic checks every so often before it becomes a problem.
Teching In
Joined: Apr 2016
Posts: 9
Likes: 0
From: Texas
I replaced my Comp Cams trunnions with about 4200 miles @ .661 lift with Straub Technologies trunnions and bushings about 1000 miles ago. This is on my LS7.
The Comps showed some severe wear given the low mileage. Not happy with that.
One thing that may had an effect is that Comp's are lift limited to .660, so they were at the absolute lift limit.
The Straub kits was a straight up swap, no issues with installation, I utilized Royal Purple 5w30 during installation of the bushings, and engine assembly grease on the rocker mount, tip and valve tip. No squeak, noise or any other normality was noted.
Check out some pics.
Worn Comps
Straub Technologies Trunnions and Bronze bushings:
Video of the Sound:
http://vid36.photobucket.com/albums/...pslg4qcioy.mp4
Again, I got about 1000 miles on them now, I recommend!
Enjoy!
The Comps showed some severe wear given the low mileage. Not happy with that.
One thing that may had an effect is that Comp's are lift limited to .660, so they were at the absolute lift limit.
The Straub kits was a straight up swap, no issues with installation, I utilized Royal Purple 5w30 during installation of the bushings, and engine assembly grease on the rocker mount, tip and valve tip. No squeak, noise or any other normality was noted.
Check out some pics.
Worn Comps
Straub Technologies Trunnions and Bronze bushings:
Video of the Sound:
http://vid36.photobucket.com/albums/...pslg4qcioy.mp4
Again, I got about 1000 miles on them now, I recommend!
Enjoy!
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
They are very quiet and my car idles smoother too... There must have been so much wear on some of my Comp trunnions that it was causing a rough idle.
Replacement parts are available for our kits and they are available through all board sponsors.
BTRs out. Looked exactly like the Comp's in this thread. Some had mild wear, some had total destruction.
9k miles on them.
Straubs in, VT noticeably quieter. I just hope they last. If they can last 20k miles, I will be happy with that.
9k miles on them.
Straubs in, VT noticeably quieter. I just hope they last. If they can last 20k miles, I will be happy with that.