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  #1  
Old Feb 17th, 11, 11:48 AM
Big White Big White is offline
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Default Wiped Cam Lobe

What are the symptoms of a wiped cam lobe:
  • Intake lobe?
  • Exhaust lobe?
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  #2  
Old Feb 17th, 11, 12:08 PM
kettbo kettbo is online now
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Default Re: Wiped Cam Lobe

most people would say popping.....sometimes rough-running

What is your car doing Rich?
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  #3  
Old Feb 17th, 11, 1:20 PM
red68chevL red68chevL is online now
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Default Re: Wiped Cam Lobe

Mine sounded like a rocker arm that wasn't adjusted right.....click,click,click, and you couldn't adjust it out. It was an intake lobe on Cyl #1.
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  #4  
Old Feb 17th, 11, 1:34 PM
Big White Big White is offline
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Default Re: Wiped Cam Lobe

Quote:
Originally Posted by kettbo View Post
most people would say popping.....sometimes rough-running

What is your car doing Rich?
George, it's popping and getting progressively worse. Started out popping on deceleration only but now pops all the time. My suspicion has been an exhaust lobe but it's only a guess. That's why I asked intake versus exhaust lobe.

Now that I've got your attention, if it comes down to replacing the cam, do you have any recommendations. It's a completely stock L34/TH400/3.31 and I would consider something a little better than the original bump stick.
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  #5  
Old Feb 17th, 11, 1:49 PM
blacknblue blacknblue is online now
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Default Re: Wiped Cam Lobe

Rich, How long has the engine been together? What kind of oil do you use? Just curious. I had always hoped that if an engine made past the first 1500-2000 miles you had it licked.
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  #6  
Old Feb 17th, 11, 2:00 PM
Big White Big White is offline
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Default Re: Wiped Cam Lobe

Quote:
Originally Posted by blacknblue View Post
Rich, How long has the engine been together? What kind of oil do you use? Just curious. I had always hoped that if an engine made past the first 1500-2000 miles you had it licked.
Troy,

I don't know the history of the engine. I've had the car for 4-1/4 years and it has always run well up to now.

As for oil, I have been using Delo 400 with 1-1/2 oz. of Lucas Engine Break-in Oil Additive for additional protection. I guess it didn't work!

Rich
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  #7  
Old Feb 17th, 11, 10:09 PM
ToocoolZ28 ToocoolZ28 is offline
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Default Re: Wiped Cam Lobe

Quote:
Originally Posted by blacknblue View Post
Rich, How long has the engine been together? What kind of oil do you use? Just curious. I had always hoped that if an engine made past the first 1500-2000 miles you had it licked.
My 427 wiped the intake lobe on number 3 cylinder after about 20,000 miles. I was using Delo 15w40 I think it was. Cam Dynamics hydraulic f/T cam.
It can happen at anytime it seems.
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  #8  
Old Feb 18th, 11, 7:11 AM
matt's66 matt's66 is offline
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Default Re: Wiped Cam Lobe

Pull the valve covers just to make certain. Let it idle and watch the rockers move. The one that barely moves or stays put is your culprit.
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  #9  
Old Feb 18th, 11, 8:46 AM
Big White Big White is offline
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Default Re: Wiped Cam Lobe

Quote:
Originally Posted by matt's66 View Post
Pull the valve covers just to make certain. Let it idle and watch the rockers move. The one that barely moves or stays put is your culprit.
Any issues containing oil with the valve covers off?
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  #10  
Old Feb 18th, 11, 9:20 AM
blacknblue blacknblue is online now
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Default Re: Wiped Cam Lobe

Quote:
Originally Posted by Big White View Post
Any issues containing oil with the valve covers off?
YES! Unless you have some of those clips to put over the rocker arms, you will have oil everywhere. I would think a close inspection with the valve covers off, without the engine running would lead you to one of the rocker arms being excessively loose. If you have access to a dial indicator measure the lift at the end of the loose rocker arm compared to others. If it is significantly less then you have found your problem. I hope thats not the case for your sake.
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  #11  
Old Feb 18th, 11, 10:52 AM
Sergio 69 SS396 Sergio 69 SS396 is offline
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Default Re: Wiped Cam Lobe

My dad said when he was driving our car in 1995 and the cam lobe went out, the engine was running VERY rough and misfiring like crazy. He also mentioned that the idle was very erratic and would way up and way down. He pulled over and had a wrecker come out and tow it home.

I myself have had a rocker arm nut back out and had the rocker fall off the pivot and it was causing a higher than normal idle yet running very rough. Glad it something so easy. I pulled the right side valve cover off and immediately saw the rocker arm sideways haha.

Good luck!
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  #12  
Old Feb 18th, 11, 10:39 PM
Stikman33 Stikman33 is online now
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Default Re: Wiped Cam Lobe

Yeah, mine didn't run right, and sounded like a rocker was out of adjustment.

I pulled a valve cover and used a remote starter to watch the valves so I didn't have to have it running and make the mess. You could obviously see which one wasn't moving anymore.
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Old Feb 19th, 11, 12:26 AM
MEJ1990TM MEJ1990TM is offline
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Default Re: Wiped Cam Lobe

Quote:
Originally Posted by Big White View Post
George, it's popping and getting progressively worse. Started out popping on deceleration only but now pops all the time. My suspicion has been an exhaust lobe but it's only a guess. That's why I asked intake versus exhaust lobe.

Now that I've got your attention, if it comes down to replacing the cam, do you have any recommendations. It's a completely stock L34/TH400/3.31 and I would consider something a little better than the original bump stick.
The 402 in the '70 is a '66 L34 short block, 063 heads, GM aluminum intake, 3310 Holley, and Isky Z-45 solid lifter cam. It runs real nice, and does well with the 3.31 gears and M22. It doesn't like real low parking lot RPM's, but other than that it drives off nice and definitely has some umph to it.
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  #14  
Old Feb 19th, 11, 9:55 AM
ToocoolZ28 ToocoolZ28 is offline
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Default Re: Wiped Cam Lobe

A Lunati Voodoo 60203 is a good cam for that engine. Mild but with a good sound and good power.
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  #15  
Old Feb 19th, 11, 2:48 PM
SWHEATON SWHEATON is offline
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Default Re: Wiped Cam Lobe

Quote:
Originally Posted by Big White View Post
Troy,

I don't know the history of the engine. I've had the car for 4-1/4 years and it has always run well up to now.

As for oil, I have been using Delo 400 with 1-1/2 oz. of Lucas Engine Break-in Oil Additive for additional protection. I guess it didn't work!

Rich

===========================================

Sorry to hear you may have a ft cam gone bad.

Since you dont know your motors prior history maybe someone didnt do best breakin asnd or used oil with low zddp so when you got motor there was alrerady significant cam/lifter wear leading to poss bad lobe-s that no oil/oil additive can fix once that starts.

Also,as i have been posting here in team chevelle for yrs now the the delo oil was just a stopgap oil for stocvk to mild RV type cams when there was almost no oil with proper zddp lvls for ft cams avail .

The delo CJ rated oil is only good for stock to very mild perf cams so if anyone uses the delo oil with moderate to hot perf cams it doesnt reaslly offer enough zddp protection.

So the delo was better then nothing when it came to zddp protection for ft cams but
wasnt best case either,esp for aftermarket perf cams with higher then stock valve spring rates.

The weak 1.5oz lucas breakin lube with 5qts oil ratio didnt offer much additonal zddp protection either unless you meant 1.5oz of the lucas TB Zin ft cam breakin lube per qt oil?

And hopefully you didnt mean the Lucas oil stabilizer which some people mistake fo rLucas TB Zinc breakin lube with elevated zddp lvls for perf ft cams.

So when you were running a zddp lvl thats margianl for your perf cam it lasted 4.5-5yrs before maybe going bad which makes sence if you truely have a bad cam.

Shells rotella has even less zddp protection for ft perf cams in the newer since 1/2007 CJ rating which i haver also been posting for yrs now.

So there is no reason at all to not run an oil with proper zddp lvl for ft perf cams these days to properly protect them.

As for cam rec,if you find cam is bad i would rec the cam i am running in my mild 396 running approx 9.7-9.8 compression with a tweaked q-jet/stock intake/exh manifolds/331's/m20.

Stock GM L34 396/350hp hyd ft cam is 214/218 deg dur @.05,.461"/.480" gross lift,114 or is it 115 deg LSA and the cam i am running in my mild 396 is also a hyd ft perf cam with 222/226,.525"/.525" gross liuft,112 deg LSA.

That cam idles well-smooth (14.0-14.5") but has an authoritative sound letting you know it's not a stock cam,it's been in the motor approx 10yrs/8k miles.

That cam run well with 19-20 deg base timing + 18 deg mech in dist for 37-38 deg total by 2500-2600rpm + 12 deg vac adv for 50 deg timing at cruise.

That cam has a lot more umph then the stock gm had giving the car a lot more go/power feeling in the old BUTTOMETER,thats for sure.

A cam in that approx range would be a decent choice for your motor-auto trans setup,could go with a few more deg int dur to 225-226 deg and still be ok with auto trans & 396 ci as long as you stay with 112 deg lsa or go to 114 deg lsa.

Scott
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Last edited by SWHEATON; Feb 19th, 11 at 3:31 PM.
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