Trunion or not to Trunion? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Rhino79 · 08-29-2015, 05:45 PM

U don't want the additional mass that most rockers add.

We use shaft mount adjustable rockers on our low lash solid roller stuff. Not too heavy on the valve tip, and ultra durable.

Irace16 · 08-29-2015, 09:59 PM

Thanks for all the responses ! Appreciate it. Think I'll wait on them , as my car is a weekend toy for five months of the year. Hasn't see a track yet although I'd like to

LSX Camaro · 08-29-2015, 10:52 PM

Quote:

Originally Posted by Irace16

I like the captured needle idea , but also read that there are more failures with the aftermarket trunions opposed to the stockers...that's why I worry ...spend money on a part that could fail sooner than stock. This should be easier to decide dammit

Where did you read this?

Rhino79 · 08-29-2015, 11:16 PM

I've actually seen more failed aftermarket trunions than stock.

Rough example

Gm makes 100000 rockers and have 75 fail, comp makes 1000 trunions and have 50 fail. Which one is really more problematic?

It's easy to blame gm for substandard parts but when you consider how many more parts they produce than the aftermarket, their failure rate isn't high at all.

Even on the ole ls3 oil pumps.

Unreal · 08-30-2015, 06:28 AM

I've seen 2-3 failed stock rocker arms, and 2-3 failed trunions. Like Rhino said, considering there are probably 200x more stock rocker arms out there, I would stick with stock.

Irace16 · 08-30-2015, 07:52 AM

Quote:

Originally Posted by LSX Camaro

Where did you read this?

When I googled Trunion upgrade it came up in two or three different places

LSX Camaro · 08-30-2015, 09:25 AM

One thing to keep in mind on failed trunions is the fact that the consumer has to assemble them.

SeaCompiler · 08-30-2015, 10:02 AM

The trunnion upgrade is stupid easy with a small press and some snap ring pliers. Doesn't take long at all. If your car is low mileage, then maybe you could skip it, I did the first time. I put my second cam in between 80-90K miles (after collapsed lifter), so I did the trunnion upgrade then. I was like - that's it? - so easy...

CWI · 08-31-2015, 09:36 AM

Quote:

Originally Posted by vroomapunk

There are multiple threads on this, and differing opinions. I did it, twice. Had a failure the first time, but I believe the stock rocker would have also failed.

I like the idea of it capturing the bearings in the event of a failure, others have said there isn't a big deal since the needles fall straight to the pan anyway.

Id do it again until I see a reason not to

Problem is they really don't capture the needles. My stock trunnions failed at 55K miles with 45K of that with a performance cam. 30K miles later with 10K on a new cam the Comp trunnions started failing. #2 intake both times for some reason. Both times needles went to the bottom. The comp trunnions don't keep the needles in place when the outer races fail. Waiting to see how long the new set will last.

08-29-2015, 09:59 PM	#16
Irace16 Drives: 2010 1SS RS M6 Join Date: Jan 2015 Location: Appleton, Wisconsin Posts: 521	Thanks for all the responses ! Appreciate it. Think I'll wait on them , as my car is a weekend toy for five months of the year. Hasn't see a track yet although I'd like to __________________ Vararam intake, gmpp exhaust, borla stainless long tubes, cat less, jannetty tune, bmr lowering springs, heritage grill , smoked lenses

08-30-2015, 06:28 AM	#19
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	I've seen 2-3 failed stock rocker arms, and 2-3 failed trunions. Like Rhino said, considering there are probably 200x more stock rocker arms out there, I would stick with stock. __________________ Nick Corvette Z06 -1200ish rwhp

08-30-2015, 09:25 AM	#21
LSX Camaro Master ASE, GM, LSX Tech. Drives: 2010 Camaro SS Join Date: Oct 2012 Location: Austin, TX Posts: 1,034	One thing to keep in mind on failed trunions is the fact that the consumer has to assemble them. __________________ 2010 2SSRS A6, Custom Pat G. Cam, WCCH Cylinder Heads, Kooks Headers/Exhaust, BTR Valvetrain, Fluidampr 25% UDP, All Engine ARP bolts, Flex-a-lite radiator/Trans cooler, Yank converter, PFADT Suspension, ADM Race Intake/Scoop, Torq tow hook, CFD auto shifter, Dynojet AFR gauge, Aeroforce scan gauge, Brake Performance rotors/pads Prothane bushings, ZL1 wheels, spoiler, Z/28 wickerbill, 1LE Aero/Suspension Package, Anderson Composites COPO Carbon Fiber Hood, LED lighting, Elite Catch Can, Improved Racing oil pan baffle, crank scraper, windage tray 480 RWHP 452 RWTQ + Nitrous Express 150 Shot

08-30-2015, 10:02 AM	#22
SeaCompiler ...not a marine biologist Drives: 2012 Camaro RY SS LS3 Join Date: Mar 2013 Location: Clarkesville, GA Posts: 752 View My Garage	The trunnion upgrade is stupid easy with a small press and some snap ring pliers. Doesn't take long at all. If your car is low mileage, then maybe you could skip it, I did the first time. I put my second cam in between 80-90K miles (after collapsed lifter), so I did the trunnion upgrade then. I was like - that's it? - so easy... __________________ Forged 416 stroker Turbocharged with Huron Speed with Cam Motion custom grind,Tuned by Vengeance, 8psi, 25% PowerBond UDP, Ported TB, shaved heads, LS9 gaskets, chromoly pushrods, BT trunnions & dual valve springs, IWIS, Might Mouse CC, SJM Line Lock,, MSD 2-Step, ZL1 Rear End, ZL1 spoiler, Strut Brace, ARP bolts, Skip shift elim, A-Pillar Gauges, FR Style 41 20X10, 3 inch exhaust, blackouts, Lowered, Custom badges, Hines vents,RPI fender vents, Technostalgia Tail Lights, Metra Kit, Pioneer stereo, Morimoto RGB Halos, "The Great Awakening" on gab.com

08-29-2015, 05:45 PM	#15
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	U don't want the additional mass that most rockers add. We use shaft mount adjustable rockers on our low lash solid roller stuff. Not too heavy on the valve tip, and ultra durable.

08-29-2015, 11:16 PM	#18
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	I've actually seen more failed aftermarket trunions than stock. Rough example Gm makes 100000 rockers and have 75 fail, comp makes 1000 trunions and have 50 fail. Which one is really more problematic? It's easy to blame gm for substandard parts but when you consider how many more parts they produce than the aftermarket, their failure rate isn't high at all. Even on the ole ls3 oil pumps.