Comp Trunnions after 12K Miles
06-01-2017, 11:05 AM
#61
FormerVendor
iTrader: (1)
Join Date: Nov 2008
Location: Santa Ana, CA. USA
Posts: 2,157
Likes: 0
Received 16 Likes
on
16 Posts
Rocker AND Lifter = SAME Hi ALL, yes twenty years ago we created the PML "carbe" intake for LS-1 AND fitted MY IGN-8 ignition controller as I was the ONLY source.
The "caught" the eye of Carl Wegner as he was creating the GN-WEST NASCAR front drive AND specifications.
The tests made then were VERY careful, one of those programs was to test ALL rocker arms made at that time.
WHAT WAS FOUND : The GM cast S/S rocker are was the best AND made more HP when the CHE trunnion was fitted.
NEVER head of one breaking and the Valve Spring (PSI 1511ML) has not ever been reported broken.
This is of course with the Valve Lift of the 1511ML in specification.
NOW the T/T engine in BAJA races use .800" lift and Crower Shaft Rockers.
So I ask about the lifters, NOT bearing style, the "bushed" style.
I have had good luck, are their others who could report problems ?
This type of problem as the SAME as with the trunnions.
Lance
The "caught" the eye of Carl Wegner as he was creating the GN-WEST NASCAR front drive AND specifications.
The tests made then were VERY careful, one of those programs was to test ALL rocker arms made at that time.
WHAT WAS FOUND : The GM cast S/S rocker are was the best AND made more HP when the CHE trunnion was fitted.
NEVER head of one breaking and the Valve Spring (PSI 1511ML) has not ever been reported broken.
This is of course with the Valve Lift of the 1511ML in specification.
NOW the T/T engine in BAJA races use .800" lift and Crower Shaft Rockers.
So I ask about the lifters, NOT bearing style, the "bushed" style.
I have had good luck, are their others who could report problems ?
This type of problem as the SAME as with the trunnions.
Lance
06-01-2017, 03:47 PM
#62
11 Second Club
iTrader: (3)
06-01-2017, 03:49 PM
#63
11 Second Club
iTrader: (3)
06-02-2017, 09:12 AM
#64
Hi ALL, yes twenty years ago we created the PML "carbe" intake for LS-1 AND fitted MY IGN-8 ignition controller as I was the ONLY source.
The "caught" the eye of Carl Wegner as he was creating the GN-WEST NASCAR front drive AND specifications.
The tests made then were VERY careful, one of those programs was to test ALL rocker arms made at that time.
WHAT WAS FOUND : The GM cast S/S rocker are was the best AND made more HP when the CHE trunnion was fitted.
NEVER head of one breaking and the Valve Spring (PSI 1511ML) has not ever been reported broken.
This is of course with the Valve Lift of the 1511ML in specification.
NOW the T/T engine in BAJA races use .800" lift and Crower Shaft Rockers.
So I ask about the lifters, NOT bearing style, the "bushed" style.
I have had good luck, are their others who could report problems ?
This type of problem as the SAME as with the trunnions.
Lance
The "caught" the eye of Carl Wegner as he was creating the GN-WEST NASCAR front drive AND specifications.
The tests made then were VERY careful, one of those programs was to test ALL rocker arms made at that time.
WHAT WAS FOUND : The GM cast S/S rocker are was the best AND made more HP when the CHE trunnion was fitted.
NEVER head of one breaking and the Valve Spring (PSI 1511ML) has not ever been reported broken.
This is of course with the Valve Lift of the 1511ML in specification.
NOW the T/T engine in BAJA races use .800" lift and Crower Shaft Rockers.
So I ask about the lifters, NOT bearing style, the "bushed" style.
I have had good luck, are their others who could report problems ?
This type of problem as the SAME as with the trunnions.
Lance
06-03-2017, 10:17 AM
#66
FormerVendor
iTrader: (1)
Join Date: Nov 2008
Location: Santa Ana, CA. USA
Posts: 2,157
Likes: 0
Received 16 Likes
on
16 Posts
Rocker Arm Bushings. Hi, to be honest, I have experience only with CHE.
The observation of the other manufacture's products states A Good Quality product.
My case IS I sent CHE my used rocker set, they replace (install) their product AND when returned I observe a new looking rocker arm set.
That cost is $400.00.
Lance
The observation of the other manufacture's products states A Good Quality product.
My case IS I sent CHE my used rocker set, they replace (install) their product AND when returned I observe a new looking rocker arm set.
That cost is $400.00.
Lance
06-07-2017, 12:07 PM
#68
IIRC the early Sharps had wear problems so they switched to fully hardened 52100, from what I've heard they held up better than the rest of the bearing kits but still wear.
Once upon a time the Summit Racing site stated that their kits are not intended for street use.
Once upon a time the Summit Racing site stated that their kits are not intended for street use.
06-07-2017, 07:52 PM
#69
IIRC the early Sharps had wear problems so they switched to fully hardened 52100, from what I've heard they held up better than the rest of the bearing kits but still wear.
Once upon a time the Summit Racing site stated that their kits are not intended for street use.
Once upon a time the Summit Racing site stated that their kits are not intended for street use.
When you use the correct material, heat treat them correctly, and machine them correctly, they work great with no wear. Go figure!
06-14-2017, 06:13 PM
#70
11 Second Club
iTrader: (3)
If anyone needs more convincing to check/get rid of your comp trunnions I thought I would share some pics. I decided to pull my ls3 rockers apart to check the trunnions after 12,000 street miles. These came already assembled on my PRC 260 cnc heads on my TSP 418 stroker. This is a street car that I have done a couple 5000 mile road trips with over the last couple years. Out of 16 rockers there were only 4 that I would have considered re-running and several have significant wear the entire width of the bearing needles and deep enough to catch a nail on. Glad I checked before they put any more metal through the motor.
Cam is a TSP 235/239, started with EHT .675 springs, now on PAC .660's. I have ordered Straub bushings to try next.
Cam is a TSP 235/239, started with EHT .675 springs, now on PAC .660's. I have ordered Straub bushings to try next.
06-15-2017, 03:32 PM
#71
They are still working fantastic...
06-29-2017, 03:06 PM
#72
Teching In
Join Date: Jun 2017
Location: Central Texas
Posts: 15
Likes: 0
Received 0 Likes
on
0 Posts
Where again can one find the CHE LS trunion kit? TSP has them for $200 and I'd gladly drive over there and pick one up if I didn't have to pay shipping and sales tax, is there anybody outside of Texas who is offering this?
06-29-2017, 06:18 PM
#74
Hi all,
Not to do any high jacking, but I thought because of the mention of the hardened metal particles getting into the oil from the failing rocker shafts and just wear in general, you might like to know about a couple products we have developed that help prevent unfiltered oil from getting into the bearings, lifters and rocker trunnions. They help force all the oil through the filter. Here is a link if you want to know how they work.
http://www.saccitycorvette.com/Billet-BarBell.html
Not to do any high jacking, but I thought because of the mention of the hardened metal particles getting into the oil from the failing rocker shafts and just wear in general, you might like to know about a couple products we have developed that help prevent unfiltered oil from getting into the bearings, lifters and rocker trunnions. They help force all the oil through the filter. Here is a link if you want to know how they work.
http://www.saccitycorvette.com/Billet-BarBell.html
__________________
Don't forget to check out our products at www.saccitycorvette.com
If you like our products, tell others! If not, tell us!
Don't forget to check out our products at www.saccitycorvette.com
If you like our products, tell others! If not, tell us!
Last edited by saccitycorvette; 11-18-2017 at 01:34 AM.
07-06-2017, 10:17 AM
#76
TECH Addict
Anyone check the Bushing kits for wear yet? I see a lot of people have changed to this kit but i don't see anyone checking them for wear. I have them for my new motor being built so it will be a while before i check.
07-09-2017, 03:02 PM
#77
TECH Junkie
This Thursday I will be pulling my comp trunnions out in favor of a bushing style trunnion. I will post pics good or bad but they will only have about 1,000 miles on them with the cam in my sig.
07-09-2017, 04:05 PM
#78
FormerVendor
iTrader: (1)
Join Date: Nov 2008
Location: Santa Ana, CA. USA
Posts: 2,157
Likes: 0
Received 16 Likes
on
16 Posts
CHE = TimeSert Hi T/A, when you call CHE, a quality manufacturing business, they WILL STATE to install TimeSert (rose-buds) AND quality Bolts in the rocker arms/cylinder heads.
Lance
Lance
07-13-2017, 06:54 PM
#80
11 Second Club
iTrader: (3)
Looks like you caught them just in time.