Go Back   LS1TECH > SBC-BBC-LT1-LT4 PERFORMANCE > LT1-LT4 Modifications
Sign in using an external account
Register Forgot Password?
Search

LT1-LT4 Modifications
1993-97 Gen II Small Block V8

Welcome to LS1Tech.com!
Welcome to LS1Tech.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join LS1Tech.com today!


Reply
 
Thread Tools Search this Thread
Old 09-05-2010, 12:39 AM   #1
9 Second Club
Garage is empty, add now
 
MattSapp95_T/A's Avatar
 
Trader Rating: 35
Join Date: Feb 2009
Location: Macclenny Florida
Posts: 1,542
Default Signs of a wiped cam lobe??

Can someone tell me what the signs of a wiped cam lobe are?

can it cause a high rpm miss?

I did a bunch of searching and didn't come up with any real solid answers..



Thanks
Matt
__________________


MattSapp95_T/A is offline   Reply With Quote
Old 09-05-2010, 09:21 AM   #2
TECH Fanatic
Garage is empty, add now
 
Trader Rating: 18
Join Date: Aug 2007
Location: Navy Base San Diego CA
Posts: 1,917
Default

uhhh yeah. im sure it would miss all over the place. not just high rpms.
__________________
LT4 Hotcam kit, LS1 Lid, 6 Speed, Competition Clutch 2.5, UMI suspension, LT Headers, Magnaflow Catback
Badazz 97 TA is offline   Reply With Quote
Old 09-05-2010, 10:51 AM   #3
TECH Addict
Garage is empty, add now
 
jaycenk's Avatar
 
Trader Rating: 1
Join Date: Jun 2009
Location: Holiday, FL
Posts: 2,200
Default

Very low power through the entire rpm range as well.
jaycenk is offline   Reply With Quote
Old 09-05-2010, 11:13 AM   #4
TECH Enthusiast
Garage is empty, add now
 
Low N Slow's Avatar
 
Trader Rating: 4
Join Date: Mar 2005
Location: Stanwood, WA
Posts: 544
Default

I had an older SBC that had two flattened cam lobes and the only real sign was a rough idle. It passed emissions testing and ran fine except for at idle. A vacuum waveform test was how I was lead to the cam having flat lobes.
__________________
1995 Arctic White T/A M6
Advanced Induction bolt-ons and a few bolt-ins
Speed Secrets tune
www.fquick.com/dugrat

2006 TBSS Silverstone Metallic
Low N Slow is offline   Reply With Quote
Old 09-05-2010, 04:31 PM   #5
TECH Addict
Garage is empty, add now
 
Trader Rating: 0
Join Date: Jun 2009
Location: Tulsa, OK
Posts: 2,018
Default

You can also pull the valve covers. Rockers that don't move as much as the rest (if at all) will tell you.
fleetmgr is offline   Reply With Quote
Old 09-05-2010, 06:07 PM   #6
TECH Regular
Garage is empty, add now
 
GREGG 97Z's Avatar
 
Trader Rating: 4
Join Date: Nov 2004
Location: PA
Posts: 415
Default

I overreved mine one too many times with the old lt4 springs, it knocked the lifter retainer plate of the #1 cylinder. I drove it for another 20 minutes before the 2 lifters got stuck sideways and started grinding down the lobes. It started screatching pretty awful that's when I shut it off. Didn't destroy the lobes just ground into them enough that the cam wasn't worth fixing.
__________________
03 ZO6 - MGW shifter, VR-B2, DTE trans brace & free mods

97z28 - 12 bolt, hotcam, bolt on's. 12.07@115/370whp SOLD! 10/2011
GREGG 97Z is offline   Reply With Quote
Old 09-05-2010, 06:27 PM   #7
9 Second Club
Garage is empty, add now
 
MattSapp95_T/A's Avatar
 
Trader Rating: 35
Join Date: Feb 2009
Location: Macclenny Florida
Posts: 1,542
Default

Mine drive fine and idles fine with no popping or back firing...the only prob I have is at high rpms it starts missing and popping... 5800+

Car still went 11.90s shifting at 5700...

i just wanted to see if a worn cam lobe can cause that kind of problem...

I just did a valve adjustment and all of the rockers looked to be moving good...
__________________


MattSapp95_T/A is offline   Reply With Quote
Old 09-05-2010, 07:00 PM   #8
TECH Fanatic
Garage is empty, add now
 
Trader Rating: 18
Join Date: Aug 2007
Location: Navy Base San Diego CA
Posts: 1,917
Default

hate to be the one to blame it since i dont like to since its more reliable then people make it out to be, but opti?
__________________
LT4 Hotcam kit, LS1 Lid, 6 Speed, Competition Clutch 2.5, UMI suspension, LT Headers, Magnaflow Catback
Badazz 97 TA is offline   Reply With Quote
Old 09-05-2010, 07:04 PM   #9
TECH Veteran
Garage is empty, add now
 
robsquikz28's Avatar
 
Trader Rating: 245
Join Date: Mar 2008
Location: Chicago/Orland Park
Posts: 4,970
Default

I will say that you either have a valvetrain issue or your opti is FUKD up. My bros car had went through 3 different optis last year on the dyno, what a fukn waste of time and it sucked badly. Then finally installed another partsladi opti and the problem went away and the car was perfect. Just like yours it would break up at 5k rpm, the 4th one fixed the problem.......OPtimus prime my friend.
robsquikz28 is offline   Reply With Quote
Old 09-05-2010, 07:38 PM   #10
9 Second Club
Garage is empty, add now
 
MattSapp95_T/A's Avatar
 
Trader Rating: 35
Join Date: Feb 2009
Location: Macclenny Florida
Posts: 1,542
Default

Just installed

Patriot extreme gold Dual springs shimmed to 1.800
No bent push rods and the length is great
1.6 pro mag roller rockers
and 1/4 preload past zero lash


I have been through 3 All Ignition optis, 2 Ac delco optis and now I have a Dynaspark....I am pretty sure it is not the opti...

New coil
New ICM
New Plugs
New Wires

I don't know I am about to set it on fire!
__________________


MattSapp95_T/A is offline   Reply With Quote
Old 09-05-2010, 08:34 PM   #11
TECH Veteran
Garage is empty, add now
 
robsquikz28's Avatar
 
Trader Rating: 245
Join Date: Mar 2008
Location: Chicago/Orland Park
Posts: 4,970
Default

Your setup seems good I have no idea why this would happen to you. But you still never know it might be a bad opti, I would try and borrow someone elses KNOWn GOOD opti on here and try it out.
robsquikz28 is offline   Reply With Quote
Old 09-05-2010, 09:20 PM   #12
10 Second Club
Garage is empty, add now
 
joelster's Avatar
 
Trader Rating: 0
Join Date: Oct 2007
Posts: 2,426
Default

Scan it during a full throttle run. Does it trip a check engine light at high rpm? This sucks man. I thought the valvesprings were surely the issue.
__________________
'94 Z28
414 cube LT1, AFR 227's, single plane
10.15 at 133.65, n/a pump gas, street car
'14 1LE, 12.991 at 109.40 bone-stock
joelster is offline   Reply With Quote
Old 09-05-2010, 09:27 PM   #13
12 Second Club
Garage is empty, add now
 
fergymoto's Avatar
 
Trader Rating: 111
Join Date: Aug 2005
Location: Hermitage, PA
Posts: 2,786
Default

It's not lean up top is it? That can cause breaking up and popping if it is that lean.
__________________
-2002 Firebird -. 4.12 at 175mph 1/8 mile. 765ci engine on 3 stages of nitrous
-1997 Trans Am WS6 M6- 10.80s N/A, 3,650lbs, 500+ mile road trips. Sold 3/2011
fergymoto is online now   Reply With Quote
Old 09-05-2010, 09:54 PM   #14
9 Second Club
Garage is empty, add now
 
MattSapp95_T/A's Avatar
 
Trader Rating: 35
Join Date: Feb 2009
Location: Macclenny Florida
Posts: 1,542
Default

Quote:
Originally Posted by joelster View Post
Scan it during a full throttle run. Does it trip a check engine light at high rpm? This sucks man. I thought the valvesprings were surely the issue.
I am going to scan it but I have to get a OBD2 style connectors for data logging... its the dumb year OBD2 connector with OBD1 pcm....Well I took it for a ride today and when it starts missing it throws a check engine light and then it dosent want to idle...turn the car off and then back on and the light is gone and it idles great...


No it never goes lean at all just starts popping and acting crazy but it will still pull to the shift light at 6400....

Here is a dyno and a pic of the motor in case anyone sees anything I am missing...

Click the image to open in full size.
Click the image to open in full size.
__________________


MattSapp95_T/A is offline   Reply With Quote
Old 09-05-2010, 10:00 PM   #15
TECH Enthusiast
1993 Chevrolet Camaro
 
old93camaro's Avatar
 
Trader Rating: 5
Join Date: Nov 2008
Location: el paso, tx
Posts: 688
Default

Unplug your d6 box and try a run, dynaspark says not to run one it there unit..just saying. Oh yea another thing are you dropping volts as this is happen could be a problem as well....I'm just throwing stuff out there
__________________

72 camaro - 5.3l in the works http://www.nastyz28.com/forum/showthread.php?t=274051

99 Trans AM - fast 90/92, qtp headers, PRC 227 heads, pat g Custom Cam, stock 6.0l bottom end, 3800 stall, 9in Moser rear end with 3.70
old93camaro is offline   Reply With Quote
Old 09-05-2010, 10:04 PM   #16
9 Second Club
Garage is empty, add now
 
MattSapp95_T/A's Avatar
 
Trader Rating: 35
Join Date: Feb 2009
Location: Macclenny Florida
Posts: 1,542
Default

yea I have tried running it with and without the D6 box... I will try it again though now that I have the Dynaspark on....

I will check voltage too....Check gauges is never on though...
__________________


MattSapp95_T/A is offline   Reply With Quote
Old 09-05-2010, 10:05 PM   #17
TECH Veteran
Garage is empty, add now
 
hitmanws6's Avatar
 
Trader Rating: 20
Join Date: Dec 2008
Location: Orange, CA
Posts: 4,060
Default

Maybe a fuel problem? My friends was doing this and he had a leaky headgasket. And my friends LS was doing this as well and he had gotten some water in his injectors when he pressure washed his motor
__________________
96 WS6 Clone LT1 PARTOUT*** SPONSORED BY WS6 RACING***PHK http://www.ls1tech.com/forums/parts-...1-partout.html
hitmanws6 is offline   Reply With Quote
Old 09-05-2010, 10:12 PM   #18
9 Second Club
Garage is empty, add now
 
MattSapp95_T/A's Avatar
 
Trader Rating: 35
Join Date: Feb 2009
Location: Macclenny Florida
Posts: 1,542
Default

I don't see it being fuel though when the A/F was in the 12s for the entire pull... even when it fell off
__________________


MattSapp95_T/A is offline   Reply With Quote
Old 09-05-2010, 10:25 PM   #19
9 Second Club
Garage is empty, add now
 
MattSapp95_T/A's Avatar
 
Trader Rating: 35
Join Date: Feb 2009
Location: Macclenny Florida
Posts: 1,542
Default

hmmm...maybe a leaky head gasket.... The compression check was good though
__________________


MattSapp95_T/A is offline   Reply With Quote
Old 09-05-2010, 10:26 PM   #20
TECH Senior Member
Garage is empty, add now
 
gregrob's Avatar
 
Trader Rating: 8
Join Date: Sep 2008
Location: 6,000+ feet
Posts: 5,109
Default

Have you checked the opti harness
__________________
How much am I gonna spray?
All of it.
-02 QuickSilver Z06 SSP Prep Auto X and TT Mule


Subscribe to me on: YouTube

Powered By Haters
gregrob is offline   Reply With Quote
Old 09-05-2010, 10:26 PM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Wiped a cam lobe.... CarolinaTA Generation IV Internal Engine 0 03-01-2013 12:29 AM
disassembled lq4 sold tjb406 Parts Classifieds 13 02-01-2013 11:10 AM
Thunder Racing cam lobes? Rise of the Phoenix Generation III Internal Engine 11 12-01-2010 02:57 PM
comp cam XFI lobe chart LS1 BU Generation III Internal Engine 2 08-23-2008 06:40 PM
Comp XFI Lobes yellergto Generation III Internal Engine 28 06-01-2006 10:37 AM


Tags
block, cam, camshaft, check, chevy, flattened, hints, indications, lobe, lobes, lt1, sbc, signs, small, symptoms, wiped


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are On
Refbacks are Off




All times are GMT -5. The time now is 12:20 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details