Today's Posts Mark Forums Read Calendar
Go Back   NJFBOA - Home of New Jersey's Camaros and Firebirds > Tech Forums > Engine / Power / Tuning

Notices


Reply
 
Thread Tools
Old 08-13-2015, 06:42 AM   #1
FlyingDutchman
 
FlyingDutchman's Avatar
 
Join Date: Dec 2008
Location: NNJ
Posts: 1,489
iTrader: (1)
Social Networks:

Rocker / lash Questions

Trying to chase down a tick / tap that sounds like it's coming from the valve train. Pulled a valve cover to look quick and noticed the rockers have a bit of play, mainly side-to-side as shown in this guys video:
http://youtu.be/hNcJjE9FDVk

Motor is a 355 LT1, CC503, stock intake/heads, LS7 lifters, CC hardened pushrods, GMPP guide plates, 1.6 ultra pro rr's, crane dbl springs, stock VC's.

Motor runs great, makes good oil pressure cold and around 30psi hot on the gauge. Gonna poke around more with a stethoscope after work with covers off.

Is there supposed to be any play? Or did these rockers come loose? Originally set them with motor out of car, didn't touch after that (~600mi on the build). I saw LTb1ow had a similar issue, less lash helped ?

Any insight is appreciated
__________________
1997 Camaro Z28 - 355 LT1, T56, CC503, LTs, ORY, Bald Eagle-back exhaust, !emissions, Lingenfelter CAI, EWP, !CAGS, BMR LCAs, UMI PHB, Koni Str.t/Koni SA, C5 Z06 front / LS1 F-body rear brake swap, factory hurst with short stick

2014 2LT Cruze 2.0 Turbo Diesel
FlyingDutchman is offline   Reply With Quote
Old 08-13-2015, 07:29 AM   #2
LTb1ow
Mongo the Meet Coordinator
 
LTb1ow's Avatar
 
Join Date: May 2008
Posts: 16,892
iTrader: (8)
Those are not ultra pro mags FYI, those are GMPP looking aluminum rockers, which AFAIK are SA rockers. Confirm this before anything else.
__________________
Quote:
Originally Posted by KirkEvil View Post
repo bigals turd gen and part it out to a loving home
LTb1ow is offline   Reply With Quote
Old 08-13-2015, 08:27 AM   #3
FlyingDutchman
 
FlyingDutchman's Avatar
 
Join Date: Dec 2008
Location: NNJ
Posts: 1,489
iTrader: (1)
Social Networks:

Quote:
Originally Posted by LTb1ow View Post
Those are not ultra pro mags FYI, those are GMPP looking aluminum rockers, which AFAIK are SA rockers. Confirm this before anything else.
Yeah those are GMPP SA rr's, but that's not my car lol just a video that show exactly what I'm trying to describe. I have ultra pro mag's.
__________________
1997 Camaro Z28 - 355 LT1, T56, CC503, LTs, ORY, Bald Eagle-back exhaust, !emissions, Lingenfelter CAI, EWP, !CAGS, BMR LCAs, UMI PHB, Koni Str.t/Koni SA, C5 Z06 front / LS1 F-body rear brake swap, factory hurst with short stick

2014 2LT Cruze 2.0 Turbo Diesel
FlyingDutchman is offline   Reply With Quote
Old 08-13-2015, 08:37 AM   #4
LTb1ow
Mongo the Meet Coordinator
 
LTb1ow's Avatar
 
Join Date: May 2008
Posts: 16,892
iTrader: (8)
Ah, ok, easy enough then Every rocker setup I have done always has "loose" rockers like that, I would not worry about that. Steel bodied roller rockers will always be noisier, so you may be overthinking. But thats assuming the noise is consistent and not localized to one area.

How much preload did you go with and how did you go about doing it?

Rocker sweep look centered both laterally and axially on valve stem?

No binding on guideplates? Side to side, or depth
__________________
Quote:
Originally Posted by KirkEvil View Post
repo bigals turd gen and part it out to a loving home
LTb1ow is offline   Reply With Quote
Old 08-13-2015, 08:58 AM   #5
FlyingDutchman
 
FlyingDutchman's Avatar
 
Join Date: Dec 2008
Location: NNJ
Posts: 1,489
iTrader: (1)
Social Networks:

Probably overthinking, I imagine the lifters bleed down a bit to allow movement. So far I haven't seen metal shards in my oil most people with "loose" rockers had pushrods bending / coming out of the seat, so I couldn't relate haha

Think I did 1/2 PZL by feel / watching lifter cup just before it started to wanna compress.

I'll have too look more closely after work, maybe pull one off and check sweep.

How would I know if the pushrods are binding ? The appeared to be touching the guide plate but isn't that normal to keep them from bouncing?
__________________
1997 Camaro Z28 - 355 LT1, T56, CC503, LTs, ORY, Bald Eagle-back exhaust, !emissions, Lingenfelter CAI, EWP, !CAGS, BMR LCAs, UMI PHB, Koni Str.t/Koni SA, C5 Z06 front / LS1 F-body rear brake swap, factory hurst with short stick

2014 2LT Cruze 2.0 Turbo Diesel
FlyingDutchman is offline   Reply With Quote
Old 08-13-2015, 10:43 AM   #6
LTb1ow
Mongo the Meet Coordinator
 
LTb1ow's Avatar
 
Join Date: May 2008
Posts: 16,892
iTrader: (8)
Binding leads to this


Make sure the PR have space for full travel.

Can you get a sound recording of noise?
__________________
Quote:
Originally Posted by KirkEvil View Post
repo bigals turd gen and part it out to a loving home
LTb1ow is offline   Reply With Quote
Old 08-13-2015, 06:58 PM   #7
FlyingDutchman
 
FlyingDutchman's Avatar
 
Join Date: Dec 2008
Location: NNJ
Posts: 1,489
iTrader: (1)
Social Networks:

Pulled cover, couldn't/didn't hear anything abnormal, phone didn't pick it up, maybe it's an exhaust leak? Ugh, I hate cars lol
__________________
1997 Camaro Z28 - 355 LT1, T56, CC503, LTs, ORY, Bald Eagle-back exhaust, !emissions, Lingenfelter CAI, EWP, !CAGS, BMR LCAs, UMI PHB, Koni Str.t/Koni SA, C5 Z06 front / LS1 F-body rear brake swap, factory hurst with short stick

2014 2LT Cruze 2.0 Turbo Diesel
FlyingDutchman is offline   Reply With Quote
Old 08-16-2015, 07:59 PM   #8
FlyingDutchman
 
FlyingDutchman's Avatar
 
Join Date: Dec 2008
Location: NNJ
Posts: 1,489
iTrader: (1)
Social Networks:

Update: After finally getting a base tune I took the car for some data logging. You could probably see where this is going apparently the car didn't like the high rpms as much as I did (motor sounded amazing!), so now the noise I was describing earlier is much more pronounced and accompanied by a slight knock/misfire/stumble at idle. I was able to get the car home without a significant loss in power and it still accelerated smooth. Oil pressure remained normal (30ish to 50ish on the gauge). Also, car had a tougher time starting since the new tune..

Here's a link to a quick video:

https://youtu.be/YeJ5I0XagaQ

Ideas?
__________________
1997 Camaro Z28 - 355 LT1, T56, CC503, LTs, ORY, Bald Eagle-back exhaust, !emissions, Lingenfelter CAI, EWP, !CAGS, BMR LCAs, UMI PHB, Koni Str.t/Koni SA, C5 Z06 front / LS1 F-body rear brake swap, factory hurst with short stick

2014 2LT Cruze 2.0 Turbo Diesel
FlyingDutchman is offline   Reply With Quote
Old 08-17-2015, 08:52 AM   #9
LTb1ow
Mongo the Meet Coordinator
 
LTb1ow's Avatar
 
Join Date: May 2008
Posts: 16,892
iTrader: (8)
Either a header gasket leak, or rocker preload.

I would go over em all again, and just verify you have correct zero lash set, then whatever you wanted preload wise. I use 3/4 turn on mine.
__________________
Quote:
Originally Posted by KirkEvil View Post
repo bigals turd gen and part it out to a loving home
LTb1ow is offline   Reply With Quote
Old 08-17-2015, 06:18 PM   #10
FlyingDutchman
 
FlyingDutchman's Avatar
 
Join Date: Dec 2008
Location: NNJ
Posts: 1,489
iTrader: (1)
Social Networks:

Quote:
Originally Posted by LTb1ow View Post
Either a header gasket leak, or rocker preload.

I would go over em all again, and just verify you have correct zero lash set, then whatever you wanted preload wise. I use 3/4 turn on mine.
Since noise was on driver side, pulled the cover again and all were good, except #1 intake was VERY loose. Since this was my first build and first time lashing valves prob didn't set poly lock on that one. Most likely loosened after yesterday's wot pulls. Will check passenger side and verify all are good. Thanks for the advice
__________________
1997 Camaro Z28 - 355 LT1, T56, CC503, LTs, ORY, Bald Eagle-back exhaust, !emissions, Lingenfelter CAI, EWP, !CAGS, BMR LCAs, UMI PHB, Koni Str.t/Koni SA, C5 Z06 front / LS1 F-body rear brake swap, factory hurst with short stick

2014 2LT Cruze 2.0 Turbo Diesel

Last edited by FlyingDutchman; 08-17-2015 at 06:20 PM.
FlyingDutchman is offline   Reply With Quote
Old 02-19-2016, 12:32 PM   #11
Pampered-Z
Sliderule / Moderator
 
Pampered-Z's Avatar
 
Join Date: Oct 2004
Location: Catawissa PA
Posts: 2,294
iTrader: (1)
delete
__________________
93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada

1) Build it
2) Race it
3) Break it
4) Repeat!!!

Last edited by Pampered-Z; 02-19-2016 at 12:35 PM.
Pampered-Z is offline   Reply With Quote
Reply

  NJFBOA - Home of New Jersey's Camaros and Firebirds > Tech Forums > Engine / Power / Tuning

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

» Sponsor List














All times are GMT -5. The time now is 11:41 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.