Straub Bushing Trunion Kits?
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
Here are my HARD road course ran rockers.
Bronze shows varnish on the bottom 1/5 of the ring only, this is where it would take the most load. There is no scuffing, galling, or deposits anywhere. The varnish is just discoloration. Trunion looks like it did when new. Nothing out of the ordinary here. Took three apart, all looked the same.
If anything, some extra lube on the bottom side would help. The grooves are on the top/nonloaded side, which is good for gravity feed - but the bottom is where the load is. These don't snow ANY wear other then the varnish, which isn't wear, but what brass does when rubbed over time. Very happy with them.
Bronze shows varnish on the bottom 1/5 of the ring only, this is where it would take the most load. There is no scuffing, galling, or deposits anywhere. The varnish is just discoloration. Trunion looks like it did when new. Nothing out of the ordinary here. Took three apart, all looked the same.
If anything, some extra lube on the bottom side would help. The grooves are on the top/nonloaded side, which is good for gravity feed - but the bottom is where the load is. These don't snow ANY wear other then the varnish, which isn't wear, but what brass does when rubbed over time. Very happy with them.
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Verdad Gallardo TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
That looks good! I have one set I installed at the shop right now still in the car, I think I might pull a few and see what they look like. I also would appreciate seat and open spring pressure numbers on these if you can as that might help define what we see.
Kurt
Kurt
Here are my HARD road course ran rockers.
Bronze shows varnish on the bottom 1/5 of the ring only, this is where it would take the most load. There is no scuffing, galling, or deposits anywhere. The varnish is just discoloration. Trunion looks like it did when new. Nothing out of the ordinary here. Took three apart, all looked the same.
If anything, some extra lube on the bottom side would help. The grooves are on the top/nonloaded side, which is good for gravity feed - but the bottom is where the load is. These don't snow ANY wear other then the varnish, which isn't wear, but what brass does when rubbed over time. Very happy with them.
Bronze shows varnish on the bottom 1/5 of the ring only, this is where it would take the most load. There is no scuffing, galling, or deposits anywhere. The varnish is just discoloration. Trunion looks like it did when new. Nothing out of the ordinary here. Took three apart, all looked the same.
If anything, some extra lube on the bottom side would help. The grooves are on the top/nonloaded side, which is good for gravity feed - but the bottom is where the load is. These don't snow ANY wear other then the varnish, which isn't wear, but what brass does when rubbed over time. Very happy with them.
I just pulled one of mine apart. Mine looked just like DietCoke. Little discoloration but are fine. The trunion itself looks more polished than new in the contact area. Mine had no scratches or shards to be found. My car has BTR platinum 660 spings shimmed .045 with open spring pressure right at 400 lbs.
The damage above to me looks like the copper bushings were sunk to deep causing interference. I spent a lot of time getting the amount of play just right. If done correctly there is some clearance for lateral movement, but not enough that the outside of the bushings can contact the snap rings.
The damage above to me looks like the copper bushings were sunk to deep causing interference. I spent a lot of time getting the amount of play just right. If done correctly there is some clearance for lateral movement, but not enough that the outside of the bushings can contact the snap rings.
I just pulled one of mine apart. Mine looked just like DietCoke. Little discoloration but are fine. The trunion itself looks more polished than new in the contact area. Mine had no scratches or shards to be found. My car has BTR platinum 660 spings shimmed .045 with open spring pressure right at 400 lbs.
The damage above to me looks like the copper bushings were sunk to deep causing interference. I spent a lot of time getting the amount of play just right. If done correctly there is some clearance for lateral movement, but not enough that the outside of the bushings can contact the snap rings.
The damage above to me looks like the copper bushings were sunk to deep causing interference. I spent a lot of time getting the amount of play just right. If done correctly there is some clearance for lateral movement, but not enough that the outside of the bushings can contact the snap rings.
The damage above to me looks like the copper bushings were sunk to deep causing interference. I spent a lot of time getting the amount of play just right. If done correctly there is some clearance for lateral movement, but not enough that the outside of the bushings can contact the snap rings.
Lateral movement would be the clearance between the shaft and bushing, which can only be adjusted by machining of the bushing or trunion bearing surface OD.
If the bushing were set too deep that would create an inside interference, in turn never allowing the snap ring to contact.
Care to try again?
These pictures of the new style are not very pleasing. Are the groves on the top where the oil flats ride?
Making re think using these on my build. Also seems no trunion upgrade is fail proof
Making re think using these on my build. Also seems no trunion upgrade is fail proof
The bushings were pressed and set to .003" of axial movement of the trunion.
Lateral movement would be the clearance between the shaft and bushing, which can only be adjusted by machining of the bushing or trunion bearing surface OD.
If the bushing were set too deep that would create an inside interference, in turn never allowing the snap ring to contact.
Care to try again?
Lateral movement would be the clearance between the shaft and bushing, which can only be adjusted by machining of the bushing or trunion bearing surface OD.
If the bushing were set too deep that would create an inside interference, in turn never allowing the snap ring to contact.
Care to try again?
I'm running a touch more spring pressure on mine, and running my lateral around .010 so far. I will pull the first set I put together this week as the car is in the shop for diff replacement. It has less than 2000 miles, but almost all on track.
Kurt
Kurt
I just pulled one of mine apart. Mine looked just like DietCoke. Little discoloration but are fine. The trunion itself looks more polished than new in the contact area. Mine had no scratches or shards to be found. My car has BTR platinum 660 spings shimmed .045 with open spring pressure right at 400 lbs.
The damage above to me looks like the copper bushings were sunk to deep causing interference. I spent a lot of time getting the amount of play just right. If done correctly there is some clearance for lateral movement, but not enough that the outside of the bushings can contact the snap rings.
The damage above to me looks like the copper bushings were sunk to deep causing interference. I spent a lot of time getting the amount of play just right. If done correctly there is some clearance for lateral movement, but not enough that the outside of the bushings can contact the snap rings.
The trunnion upgrades are definitely not fool proof, but this bushing style is already better then the bearing style in my limited testing. Tracking these parts wearing out and what they are used in when failing should help figure out what they don't like.
Kurt
Kurt
My car is street strip, but it's nothing to put 200 miles a week or more sometimes. These have been in nearly since release. The car has had, street, dyno, and track passes. Hell, the other day I ran 45 minutes one way down the interstate at 3200 rpm steady(th400).