JakeFusion

iTrader: (7)

Back to CHE I guess. LOL.

It's 420 exchange or 642 outright from Richard @ WCCH.

96lt4c4

iTrader: (5)

I don't see how guys are ******* up that snap rings? You don't have to spread the danm things a foot wide to get them on. I just did my second set, one for a buddy and just did mine. They are a very nice upgrade.

DietCoke

iTrader: (18)

.669/.670

I went back and dug the actual measurements of the spring pressure from my data. All the intake springs tested between 480 and 484lbs at installed height, the exhaust slightly less at around 465lbs. The 425s are for my new pac springs, had it backwards

badassracing

iTrader: (13)

Thats a lot of spring pressure on stock rockers. Not sure how much the trunion kits should handle but if IIRC Brian Tooley recommends not going over 400lbs with stock rockers because it will wear the valve and rocker tips.

DietCoke

iTrader: (18)

Harlan sharp used to (might still) offer rocker trunions, and they admittedly had a heat treat issue. Looks exactly like my comp ones did, except comp wouldnt fess up to it.
https://ls1tech.com/forums/generatio...cs-inside.html

Some other failure threads
https://ls1tech.com/forums/generatio...g-ls2-gto.html

https://ls1tech.com/forums/generatio...e-problem.html

http://lsxnation.net/forum/showthrea...-you-comp-cams

http://lsxnation.net/forum/showthrea...our-f-trunions

DietCoke

iTrader: (18)

Rockers take it like champs, the trunion upgrade... eh... the whole reason I like the CHE upgrade is that there is literally 3 times the surface area of the comp trunions to spread out the spring load. No chance of failure.

03Sssnake

iTrader: (20)

Lunati sells a retro-fitted stock rocker, not sure who the supplier for the trunion and bearing is. Anybody know anything about these? FWIW colorado speed sells them out the door for 268 and no core charge.

I had heard about these failures prior to upgrading my own, but chalked it up to some one off incidents. I pulled mine about 100 miles ago to go with shorter PR and all snap rings were in place, all rockers rolled smoothly.

I am using BTR platinum duals...

96lt4c4

iTrader: (5)

Wow, there is your problem, too much spring. You are going to wear the valve tips out. You need to upgrade rockers. Roller tip.

DietCoke

iTrader: (18)

For what its worth mine all rolled perfectly smoothly (even the galled ones). Wasnt until I pressed them apart that I even knew they were worn.

DietCoke

iTrader: (18)

No, I'm not, and neither are the thousands of other people who buy these commonly stocked and sold with cam kit shelf springs TSP sells/sold.

Why do I need to upgrade rockers? (There are none that will work with my heads, but I'd like to hear your logic)

This car isn't a driver. It sees ~2000 miles a year, tops

03Sssnake

iTrader: (20)

Dietcoke, did all of your trunions show the same wear?

DietCoke

iTrader: (18)

15/16 rockers showed wear. The offset rockers showed more wear on the offset side then the opposite side, and that was the heaviest of all wear on those 8 bearings

JakeFusion

iTrader: (7)

Sky high springs pressures would put a lot of stress on the whole rocker assembly. Not saying it caused it, but I wouldn't be surprised if that didn't contribute to it.

Like I said before, the LS7 guys have seen more issues than anyone with stock and upgraded rockers. Their springs, cams, and offset intake, and 1.8 ratio all are at a level above where most of us LS1 guys play at. Maybe with BTR springs, endurance type lobes, and lightweight valves, you wouldn't see this problem. Or it'd take a lot longer to notice it.

DietCoke

iTrader: (18)

If any of you think 480 lbs is sky high, you need to pass the reefer

JakeFusion

iTrader: (7)

480lbs is a lot for the application. No need to run those kind of spring pressures. You aren't running BBC valves that weigh 150g. But maybe you needed it, I don't know. If so, you're case becomes an outlier for what the trunion upgrade was designed for. Still doesn't mean there aren't any issues...

3rdCoastPowerSports

iTrader: (5)

Has any of the metals in question been tested for hardness?

If not all of this is hearsay.

For what its worth i have been rocken the comp trunions in my personal ride for the last year (around 12,000 miles). For the last year i have also been rocken a Comp cam cut on LSK lobes. I have 400lbs pressure. No issues what so ever. I even R&R the valve springs 3,000 miles ago checked everything out, everything was good to run.

3rdCoastPowerSports

iTrader: (5)

DietCoke why did you press the bearings out if they were working smoothly? forgive me u might have posted the reason earlier i just missed it.

DietCoke

iTrader: (18)

Because I lost a c-clip end, and was checking that particular rocker for any issues. Found the wear, and pressed the other 15 out. Same wear. Surprise.


You also don't have 4xx pounds of seat pressure, you would pull the keeper off the valve when it opened... lol. 400+ open most likely.

Keep in mind my rockers were all working fine when I discovered the issue, and would likely still be working fine today. Doesn't mean the issue isnt there.

I didn't rockwell the trunion/bearings, because I don't give a **** about it either way. Not giving comp another chance to trash my engine

C5natie

iTrader: (1)

There's still thousands of comp cams trunions out there surviving just fine on some very healthy cammed cars. When you make thousands of anything there's always a chance some may not get heat treated correctly. If a bad batch got out I wouldn't call all their products trash. Ive had no issues with my comp cams cam I installed last July. I bought the trunion upgrade kit months ago and just got to install them so we'll see how they go. My spring pressures are 475lbs open.

3rdCoastPowerSports

iTrader: (5)

ahh... good catch i did mean open. If you still have the trunion/ trunion's send it to me and i will get it tested. I have done alot of trunion upgrades and have not had 1 single warranty due to a trunion upgrade failure. Until the metal gets tested it is what it is.