Straub Bushing Trunion Kits?
With the overwhelming response to this product we will have a bolt kit and fixtures. For those Vendor supporters we will over a tooling kit for those that will be doing retro fits in house.
This trunion discussion concerns me. When I purchased my cam I was told to use a needle bearing kit on stock rockers. I have a baby cam but still it was recommended. Now that may start shredding metal into my engine? I put low miles per year on the car but in a year or two I need to have someone tear into my engine to check or replace the trunion upgrade? Frustrating.
This trunion discussion concerns me. When I purchased my cam I was told to use a needle bearing kit on stock rockers. I have a baby cam but still it was recommended. Now that may start shredding metal into my engine? I put low miles per year on the car but in a year or two I need to have someone tear into my engine to check or replace the trunion upgrade? Frustrating.
Has anyone tried the ColoradoSpeed trunion/bushing kit, looks like the exact same as the Straub Kit that Tick Performance is selling, same price, so I am guessing it is.
http://www.coloradospeed.com/roller-...t-p-42090.html
http://www.coloradospeed.com/roller-...t-p-42090.html
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These are 8000 mile 427 Pro Touring type Camaro, raced often with some miles traveling to the events. This is common damage with after market trunion kits, I have seen damage with 4000 miles.
I have the CHE and Straub kits going into two engines now, will know more by summers end.
Kurt
I have the CHE and Straub kits going into two engines now, will know more by summers end.
Kurt
Banned
Joined: Aug 2006
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From: North Bay, CA
These are 8000 mile 427 Pro Touring type Camaro, raced often with some miles traveling to the events. This is common damage with after market trunion kits, I have seen damage with 4000 miles.
I have the CHE and Straub kits going into two engines now, will know more by summers end.
Kurt
I have the CHE and Straub kits going into two engines now, will know more by summers end.
Kurt
Trunnion kits are being used in "driving experience" corvettes. Trunnions checked after 6000 miles of road course driving. This is a over a 6 week time frame. Trunnions checked perfect.
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Joined: Aug 2006
Posts: 326
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From: North Bay, CA
Would there be any change to pushrod length with swapping to these? I have the Comp kit now and have Johnson short-travel lifters, so if I change the distance of the rocker from the heads, I'd probably have to order new pushrods since the preload window is so narrow.
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Joined: Aug 2006
Posts: 326
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From: North Bay, CA
No, even with our tip trued and polished rocker sets we don't remove more than .005-.007" off the pad. If you're just swapping one trunnion kit for the other, there won't be any pushrod length change because the centerline of the trunnion stays at the same height.
These are 8000 mile 427 Pro Touring type Camaro, raced often with some miles traveling to the events. This is common damage with after market trunion kits, I have seen damage with 4000 miles.
I have the CHE and Straub kits going into two engines now, will know more by summers end.
Kurt
I have the CHE and Straub kits going into two engines now, will know more by summers end.
Kurt
I brought up your findings in this thread and others after members asked about the longevity of traditional needle bearing style trunion kits versus what could be expected with the bushing style trunion kits.
I'm glad you chimed in and were able to validate this.
Your experience and knowledge are a huge benefit to the ls community Kurt. Are you seeing any additional or added wear on the exhaust trunions Kurt? Especially in higher HP/higher cylinder pressure type applications where there is more load placed on the exhaust side of the valve train?
You can easily see where the individual needles that were receiving all of the load wore into the trunion. By spreading this load out with a bushing, using a REM polished tool steel trunion and the additional oiling the Straub kit provides from the dedicated oiling channels, this wear seen in Kurt's pictures will be a thing of the past.
Anyone with a needle bearing kit should highly consider swapping to this bushing style kit.
Last edited by Martin Smallwood; Feb 25, 2016 at 12:30 AM.
These are 8000 mile 427 Pro Touring type Camaro, raced often with some miles traveling to the events. This is common damage with after market trunion kits, I have seen damage with 4000 miles.
I have the CHE and Straub kits going into two engines now, will know more by summers end.
Kurt
I have the CHE and Straub kits going into two engines now, will know more by summers end.
Kurt
When I look at the wear, it looks like a lot more than 3-4 rollers are contacting the surface as what is being said. It looks like it has about 30-40% contact area. I hope the new bushing kits work for you, because I do not think the cheap roller upgrade kits were designed for the applications you are using them for. As for the probably thousands of other people using them, they are probably working fine.