Comp Cams rocker arm trunion upgrade!!!
04-21-2010 | 12:08 AM
#41
I assure you.... Comp does their homework.
04-21-2010 | 12:13 AM
#42
Guys,
I didn't mean to stir up controversy. There are many a LSX powered car with these trunion upgrades that work just fine.
Even the most expensive exotic parts can fail, it's just the nature of the beast. No part is absolutely perfect.
I say let Brian hook you up and be happy. Perhaps he can work a package out with you where you send them in and he presses them in for you.
cough cough. LOL
.
I didn't mean to stir up controversy. There are many a LSX powered car with these trunion upgrades that work just fine.
Even the most expensive exotic parts can fail, it's just the nature of the beast. No part is absolutely perfect.
I say let Brian hook you up and be happy. Perhaps he can work a package out with you where you send them in and he presses them in for you.
cough cough. LOL
.
04-21-2010 | 12:15 AM
#43
And I know the DIY concept is new.
Harland Sharp just recently started offering a DIY kit too.
Yes Comp is a good company but thier description on these trunions is a little mirky.
.
04-21-2010 | 12:26 AM
#46
Yes keeping the information accurate is a good thing.
There are plenty of guys running the stock rockers and upgraded trunions with very little problems and they have a lot more horsepower and RPM than
I do.
.
There are plenty of guys running the stock rockers and upgraded trunions with very little problems and they have a lot more horsepower and RPM than
I do.
.
04-21-2010 | 12:29 AM
#47
One more important issue I wanted to ask about...
Since shorter bolts are needed when this upgrade is done, does that mean the rocker sits lower on the pedestal than before? If this were the case, wouldn't the wipe pattern on the valve stem be affected?
Since shorter bolts are needed when this upgrade is done, does that mean the rocker sits lower on the pedestal than before? If this were the case, wouldn't the wipe pattern on the valve stem be affected?
04-21-2010 | 12:30 AM
#48
04-21-2010 | 12:30 AM
#49
Okay, I'm fairly new to LS engines.... I own a couple, but both one is in the build stage, and the other is just for parts and mock up purposes.
At what point is it a good idea to upgrade the stock rockers?? Is this a failure that is fairly common on all LS motors or just ones that have alot of valvespring pressure and high lift??
I know a guy who has 463,000 miles on his 5.3L in his work truck....he has only changed oil, plugs, one coil, rebuilt tranny, and replaced fuel pump (once). I realize this is exceptional for any non-diesel engine, but it's one of the reasons I started considering an LS. Are his rocker arms likely to send needle bearings through his oil pump at any time now? I'd think if they are a problem, that his would have to be completely worn out.
At what point is it a good idea to upgrade the stock rockers?? Is this a failure that is fairly common on all LS motors or just ones that have alot of valvespring pressure and high lift??
I know a guy who has 463,000 miles on his 5.3L in his work truck....he has only changed oil, plugs, one coil, rebuilt tranny, and replaced fuel pump (once). I realize this is exceptional for any non-diesel engine, but it's one of the reasons I started considering an LS. Are his rocker arms likely to send needle bearings through his oil pump at any time now? I'd think if they are a problem, that his would have to be completely worn out.
04-21-2010 | 12:53 AM
#50
They should just be a bolt on. They should fit the same as far as I know.
I can't tell you about the Comp upgrade because mine didn't come with bolts but the Harland uses a shorter allen head bolt with the threads in a different position.
.
Last edited by bearcatt; 04-21-2010 at 01:12 AM.
04-21-2010 | 01:11 AM
#51
Okay, I'm fairly new to LS engines.... I own a couple, but both one is in the build stage, and the other is just for parts and mock up purposes.
At what point is it a good idea to upgrade the stock rockers?? Is this a failure that is fairly common on all LS motors or just ones that have alot of valvespring pressure and high lift??
I know a guy who has 463,000 miles on his 5.3L in his work truck....he has only changed oil, plugs, one coil, rebuilt tranny, and replaced fuel pump (once). I realize this is exceptional for any non-diesel engine, but it's one of the reasons I started considering an LS. Are his rocker arms likely to send needle bearings through his oil pump at any time now? I'd think if they are a problem, that his would have to be completely worn out.
At what point is it a good idea to upgrade the stock rockers?? Is this a failure that is fairly common on all LS motors or just ones that have alot of valvespring pressure and high lift??
I know a guy who has 463,000 miles on his 5.3L in his work truck....he has only changed oil, plugs, one coil, rebuilt tranny, and replaced fuel pump (once). I realize this is exceptional for any non-diesel engine, but it's one of the reasons I started considering an LS. Are his rocker arms likely to send needle bearings through his oil pump at any time now? I'd think if they are a problem, that his would have to be completely worn out.
The LS series motors are a great simple reliable engine.
Your mileage may vary, some folks get lucky and get a lot of miles out of thier LS motors without any problems.
With a high mileage motor anything is possible I suppose.
.
04-21-2010 | 02:19 AM
#52
TECH Senior Member
Joined: Apr 2002
Posts: 6,077
Likes: 12
From: So.Cal.
Needles and rollers are the same thing when speaking about needle or roller bearings...
The other bearing is referred to as a "raced" bearing...
A raced bearing can have either needles/rollers or *****.
The other bearing is referred to as a "raced" bearing...
A raced bearing can have either needles/rollers or *****.
04-21-2010 | 07:24 AM
#53
Since our rocker arms are non ajustable, the valve tip never changes, and the trunion is always bolted to the same place and doesnt move. That means the pushrod seat has to alway be in the same place also. So pushrod length changes shouldnt affect wipe pattern, only change lifter plunger depth.
06-02-2010 | 11:27 AM
#54
I installed these last night in a set and the install is pretty straight forward. Only thing I noticed is that the trunion does not move to freely once installed-some were harder to move around than others. Is this normal and will they "free" up over time or with a few heat cycles?
05-18-2011 | 01:28 PM
#56
While needle bearings and roller bearings are similar the needle bearing is open on one or two sides and only held by a cage where a roller bearing is held by a middle cage and an inner and outer casing. while needle bearings are just that they look like needles. Roller bearings can be made out of ball, needle, or any type of bearing as long as it is encased thus "rolling" on the casing.
Roller bearing
Needle Bearing
Hence as you can see the is greater ability to loose a needle bearing than there ever be of loosing a bearing out of a roller bearing. Also you can see the where the rocker is making contact directly with the bearing itself in the needle bearing where the rocker on the roller bearing is actually moving on the casing itself. Therefore failure being less likely with a roller bearing than with a needle bearing set up.
Roller bearing
Needle Bearing
Hence as you can see the is greater ability to loose a needle bearing than there ever be of loosing a bearing out of a roller bearing. Also you can see the where the rocker is making contact directly with the bearing itself in the needle bearing where the rocker on the roller bearing is actually moving on the casing itself. Therefore failure being less likely with a roller bearing than with a needle bearing set up.
05-18-2011 | 03:36 PM
#57
Way to bump a dead thread. 
Well as long as we're here, I also purchased and installed these COMP rocker arm bearings. I used a small drill press with the drill bit removed to install my bearings. Simple. Let's just hope they last. A couple of them have a slight notchy feel when spinning them.
Well as long as we're here, I also purchased and installed these COMP rocker arm bearings. I used a small drill press with the drill bit removed to install my bearings. Simple. Let's just hope they last. A couple of them have a slight notchy feel when spinning them.
05-27-2011 | 01:31 AM
#59
I installed these last night in a set and the install is pretty straight forward. Only thing I noticed is that the trunion does not move to freely once installed-some were harder to move around than others. Is this normal and will they "free" up over time or with a few heat cycles?
ps- those teeth are a dentist's goldmine right there!
haha