Arrrrg! Smoked the cam. - Team Camaro Tech
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post #1 of 19 (permalink) Old Jun 16th, 15, 07:45 PM Thread Starter
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Mule
 
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Angry Arrrrg! Smoked the cam.

Just venting...
Pretty close to complete with the resto. 396, 500 miles on a fresh rebuild. Started stumbling and missing. Chasing the cause, found blown intake gasket, a pan full of oil-antifreeze milkshake, 4E pushrod in a mr pretzel form, 4I pushrod tip beat off, and about all lobes (but cylinder 4) wiped. Only thing I can think of is prior to all this I ahd a big backfire while starting up (had been sitting a while and was pumping gas into dry carb). Glad it's summer, makes the beer taste better while cleaning up this mess.

Mule

Buckets and piles of a 1968 SS Conv 396
-piles are getting smaller, and it started !
- got the paint on, interior is next.
- interior is about done, it's cruise'able !
- down to top,windows and a few little pieces and it's done
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post #2 of 19 (permalink) Old Jun 16th, 15, 09:00 PM
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Re: Arrrrg! Smoked the cam.

Did you build the engine?

With you forensics it hard to tell what broke 1st.
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post #3 of 19 (permalink) Old Jun 17th, 15, 01:01 AM
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Re: Arrrrg! Smoked the cam.

Who built the engine what cam brand and model number also what lifters and motor oil was used. Alex
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post #4 of 19 (permalink) Old Jun 17th, 15, 06:35 AM Thread Starter
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Re: Arrrrg! Smoked the cam.

My build with some local machine work.
Cam was a Crane2030. Going back with a Lunati.
With the #4 cylinder clean lobes and those pushrods both messed up, I'm thinking it has to be the backfire popped the gasket and the pushrods (not sure i believe this yet), then antifreeze in oil smoked the cam. Both 4E and 4I lobes are fine. The rest are pretty much wiped. Oil was originally Val 10/30. Lifters were Comp. Springs came with cam.

Backfire wasn't anything huge, but not normal. Car had been sitting in shop for a few weeks. Has/was running fine prior to this. After a few weeks, the gas evaps from carb, so I'm pumping and turning over to get fuel to carb...backfire.

Mule

Buckets and piles of a 1968 SS Conv 396
-piles are getting smaller, and it started !
- got the paint on, interior is next.
- interior is about done, it's cruise'able !
- down to top,windows and a few little pieces and it's done
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post #5 of 19 (permalink) Old Jun 17th, 15, 09:20 AM
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Re: Arrrrg! Smoked the cam.

Odds are the cam went flat first. What kind of break in procedure/lube did you use when you first fired the engine?

Experience...... It's what you get when you didn't get what you wanted.
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post #6 of 19 (permalink) Old Jun 17th, 15, 09:37 AM
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Re: Arrrrg! Smoked the cam.

Not familiar with a Crane 2030 is it new stuff or old . They are supposed to be making excellent quality cams since S&S took them over . why would you use Comp lifters on a Crane cam ?Are these left over parts you had ? The 10 / 30 Valvoline was it VR-1 Silver bottle or regular ? Did you use a bottle of break-in lube. Did you slop up the lobes with any type of extreme pressure lubricant like Isky REV-LUBE. Like Brian said we need to know all these things . Alex
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post #7 of 19 (permalink) Old Jun 17th, 15, 10:51 AM
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Re: Arrrrg! Smoked the cam.

Spring pressure is another factor; especially on break in. Flat tappets do not tolerate a lot of spring pressure now thanks to changes in the oil formulation. You can run ZDDP additive all the time to compensate, but even when these motors where brand new a flat tappet and a stiff valve spring was a recipe for a disaster.

Big Dave
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post #8 of 19 (permalink) Old Jun 17th, 15, 01:20 PM
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Re: Arrrrg! Smoked the cam.

Quote:
Originally Posted by ss27 View Post
Not familiar with a Crane 2030 is it new stuff or old . They are supposed to be making excellent quality cams since S&S took them over . why would you use Comp lifters on a Crane cam ?Are these left over parts you had ? The 10 / 30 Valvoline was it VR-1 Silver bottle or regular ? Did you use a bottle of break-in lube. Did you slop up the lobes with any type of extreme pressure lubricant like Isky REV-LUBE. Like Brian said we need to know all these things . Alex
Crane was sold again last year.

Chris

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post #9 of 19 (permalink) Old Jun 17th, 15, 01:35 PM
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Re: Arrrrg! Smoked the cam.

I would highly recommend going hyd roller. I have had many go this route with resto's.

Chris

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post #10 of 19 (permalink) Old Jun 17th, 15, 07:00 PM
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Re: Arrrrg! Smoked the cam.

I went roller after losing 2 solid lifter cams. 1st lasted about 50k and the 2nd 8700 mi. The 2nd was broke in using my old springs with Joe Gibbs BR oil. Joe Gibbs 10w-30 Hot Rod oil was used after the cam was worked for a few hundred miles then I changed the springs and broke in the springs the same way as the cam per Lake Speed Jr (Joe Gibbs Racing).

Mark 70 Z28 M22 3.73 Z21 Z87 - Lunati 20120121 Roller Cam

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post #11 of 19 (permalink) Old Jun 17th, 15, 07:16 PM
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Re: Arrrrg! Smoked the cam.

IMHO the Joe Gibbs products are not the best.

I've used Valvoline VR-1 and not had issues.

There is no reason Flat Tappet Can Installations can not be successful.

But yes if possible pony up for the rollers
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post #12 of 19 (permalink) Old Jun 17th, 15, 09:20 PM
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Re: Arrrrg! Smoked the cam.

After using Joe Gibbs Hot Rod oil, I switched to Valvoline VR1 with a bottle of EOS. I still lost a lobe. It's today's crappy steal and hardening process they're using.

Mark 70 Z28 M22 3.73 Z21 Z87 - Lunati 20120121 Roller Cam

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post #13 of 19 (permalink) Old Jun 17th, 15, 10:20 PM
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Re: Arrrrg! Smoked the cam.

Well now we have just learned from Chris Straub that S&S no longer owns Crane Cams . Just for that reason now I would not buy a cam from them .So what does that leave . you cant buy a Lunati they are owned by brand CC so that quality is gone . So for flat tappet cams you have Isky Howards Engle Crower Clay Smith and Schnieder. I have used the first three all excellent quality no problems . the last three I just don't know they do have excellent reputations for quality. IF I had the funds to go roller I would definatly go with a Chris Straub roller the list of smiling and happy customers is endless. I wish he sold a line of F / T cams I would buy one . Alex
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post #14 of 19 (permalink) Old Jun 18th, 15, 07:23 AM
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Re: Arrrrg! Smoked the cam.

From a few yrs ago.

Camshaft Machine Company (CMC) located in Jackson, Michigan was established in 1942 and is probably the largest designer and manufacturer of automotive camshafts in the world. CMC produces cams for GM, Ford, Chrysler, Comp Cams, Lunati, Edlebrock, Crane, Wolverine and many others.

Most (but not all) of the automotive camshafts produced today are produced at one of the Big Three cam manufacturers all located in Michigan. CMC of Jackson, MI., Engine Power Components (EPC) of Muskegon, MI., and Waver Bartel Cam Company, of Grand Haven, MI.

So the next time you buy your new Comp Cams, Lunati, Ultradyne, Iskenderian, Engle, or other cam there is a good chance it was actually made in Michigan at one of the top three cam makers. What the cam companies do is have their proprietary grinds (design, lob profile etc.) and have them ground by one of the big three. Very few cams are actually ground by a name brand cam company, Crane is one exception but they donít grind all of theirs either.

Mark 70 Z28 M22 3.73 Z21 Z87 - Lunati 20120121 Roller Cam

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post #15 of 19 (permalink) Old Jun 18th, 15, 07:31 AM
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Re: Arrrrg! Smoked the cam.

Quote:
Originally Posted by COPO View Post
From a few yrs ago.

Camshaft Machine Company (CMC) located in Jackson, Michigan was established in 1942 and is probably the largest designer and manufacturer of automotive camshafts in the world. CMC produces cams for GM, Ford, Chrysler, Comp Cams, Lunati, Edlebrock, Crane, Wolverine and many others.

Most (but not all) of the automotive camshafts produced today are produced at one of the Big Three cam manufacturers all located in Michigan. CMC of Jackson, MI., Engine Power Components (EPC) of Muskegon, MI., and Waver Bartel Cam Company, of Grand Haven, MI.

So the next time you buy your new Comp Cams, Lunati, Ultradyne, Iskenderian, Engle, or other cam there is a good chance it was actually made in Michigan at one of the top three cam makers. What the cam companies do is have their proprietary grinds (design, lob profile etc.) and have them ground by one of the big three. Very few cams are actually ground by a name brand cam company, Crane is one exception but they donít grind all of theirs either.

Well stated and right on Target!!!!

Chris

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