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06-20-2013, 09:23 AM
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#1 |
Drives: 2000 Pontiac Trans Am Join Date: Jan 2013
Location: Houston, TX
Posts: 73
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GM Trunion Failure Strikes Again!!
If you have never seen or heard of the GM trunions failing, this is what it looks like. You may notice a slight ticking, which will develop quickly into a loud hammering sound. The following photos show a recent example of what happens. No piston to valve contact, no coilbind issues with the springs, open pressure is under 400lbs, and the valve lift is under .600". For fellow car enthusiasts, the following photos are graphic.
    We offer several brands of the Trunion Upgrade kits, and perform the installs here in house. This is the reason we recommend the Trunion Upgrade with every cam we sell and install. The upgrade focuses on replacing the sintered iron OEM trunion with a billet steel trunion, and replace the loose needle bearings with a different design, often a caged needle bearing. Comp Cams, for example, has tested and validated their upgrade kits in their NASCAR GM LS Spec engines. The cost to upgrade these rockers is minimal in the grand scheme of things, if they are done in time. But if it is too late, like in this case, costs can stack up considerably. Don't let this happen to you. |
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06-20-2013, 10:37 AM
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#2 |
          
Drives: Race Car Join Date: Sep 2009
Location: Seffner, FL
Posts: 6,226
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The Comp Cams trunion upgrade is so cheap that I just don't understand why everyone doesn't do them when they install a cam. For me it is just cheap unsurance to do it anytime a cam goes in. The last thing you want to do is pull needle bearings out of the oil pan on your car.
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06-20-2013, 10:42 AM
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#3 |
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Drives: 2011 2SS Join Date: Jan 2013
Location: DFW, TX
Posts: 931
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Does no one make a good after market rocker arm?
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06-20-2013, 10:53 AM
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#4 | |
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Bayou City Muscle Cars
Drives: 2013 2SS Dusk Edition Join Date: Jan 2013
Location: Houston Texas
Posts: 1,443
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Quote:
Did mine at same time. Sent from my HTC One using Tapatalk 2
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2013 2SS Dusk Edition
Lethal Racing Stage V PER 418ci Forged LS3 530/520 SAE |
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06-20-2013, 11:21 AM
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#5 |
Drives: 2SS/RS - Black - GFX Join Date: Nov 2008
Location: B'ham, Alabama
Posts: 2,458
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Is that the stock oil pan plug? Or did you add a magnetic plug.
I sure hope you have all of those needle bearings scooped up.
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Ordered: 10-13-08
Built: 3-30-09 (#1691) Recieved: 6-12-09 Blacked out, Cammed (Lunati Voodoo 233/245, .578/.598 @114°, +4°), ARH LTs, VR OTR CAI, Cutouts, and lots of other fun mods. |
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06-20-2013, 11:21 AM
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#6 | |
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V8 Lounge member #2
Drives: 2001 Ws6 Join Date: Sep 2009
Location: Burbank,IL
Posts: 6,373
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Quote:
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2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.
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06-20-2013, 11:28 AM
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#7 | |
Drives: 2012 45th Vert, 2011 4x4, 9sec Vega Join Date: Mar 2012
Location: Canada
Posts: 2,188
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Quote:
Also, you can get a shaft rocker kit, where the 2 rockers on the same piston are joined by a single shaft. This adds strength and stability. For $485. There was a member here who posted here about a trunnion kit failure and in the pics it clearly showed to me and others that he installed the snap ring improperly.
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I feel it only fair to warn you, I have a black belt in CAPS LOCK.
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06-20-2013, 11:44 AM
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#8 | |
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Drives: Race Car Join Date: Sep 2009
Location: Seffner, FL
Posts: 6,226
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Quote:
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06-20-2013, 02:33 PM
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#9 | |
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V8 Lounge member #2
Drives: 2001 Ws6 Join Date: Sep 2009
Location: Burbank,IL
Posts: 6,373
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Quote:
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2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.
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06-21-2013, 07:02 PM
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#10 |
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Guardians Of The Night
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This is why I went with CHE precision rockers. Stock rocker, just eliminating the needle bearings all together!
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2013 ZL1 Crystal Red Tintcoat, Stock...for now
1968 SS/RS 396- being resurrected. 2011 SS LS3-Cammed, bolt-ons.(SOLD) |
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06-21-2013, 09:51 PM
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#11 |
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ʇuɐıʌǝp lɐıɔos
Drives: 2011 2SS/RS LS3/M6 Join Date: Feb 2011
Location: Pennsylvania
Posts: 231
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Also decided to go with CHE rockers at the last minute when I did heads and fly-cut my pistons last winter. When I put my cam in the previous winter, I did the Comp upgrade. About a week after I sent CHE my rockers, they called to ask how long I had ran the Comp upgrade and told me the trunnions were excessively worn. The Comp parts only had 2500 miles on them. Apparently, the Comp upgrade can also fail. The bottom picture is from ls1tech and looks like how my trunnions were described by CHE. I also now only use oil with adequate levels of ZDDP antiwear additive (1143 phosphorus/1314 zinc).
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06-21-2013, 10:14 PM
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#12 |
 
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This whole thread scares me lol
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06-22-2013, 01:46 AM
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#13 |
Drives: 2017 Camaro SS1LE 2000 Trans Am WS6 Join Date: Jul 2008
Location: Portland, TN
Posts: 2,955
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I did the Comp Cams trunion upgrade on mine. Very simple to do.
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2017 Krypton Green SS 1LE
Magnacharged 2000 Trans Am WS6 manual trans 2002 Trans Am 2015 Ram Crew Cab Cummins |
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