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  #1  
Old Apr 14th, 09, 9:06 PM
ragtop69ss ragtop69ss is offline
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Default thumper cams

any body used one yet good or bad thanks
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  #2  
Old Apr 14th, 09, 10:03 PM
zeke67 zeke67 is offline
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Default Re: thumper cams

From what I've read here, not the best. From the magazines, awesome stuff.
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  #3  
Old Apr 14th, 09, 10:57 PM
ABAD72 ABAD72 is offline
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Angry Re: thumper cams

no matter what the tech guys at jeggs or sumitt will say,, the thumper cam is a cast iron grind, dont even think about it unless you order a steel one rite from comp.. I got 2 bad ones rite out the box, from sumitt... azz far azz performance goes -I cant tell a seat of the pants different from the stock zz4 cam i took out of my zz4,, I havent ran a 1/4 with it yet to tell if it is faster,,, but it does sound like a beast... here is a link video of the second bad one I got... comp actually eneded up makin me a steel one after the problems I had with sumitt bad cast ones..If I hadnt already had the matching valve train components in my heads already I would of went a different way..



http://s192.photobucket.com/albums/z...2_11_40_11.flv
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  #4  
Old Apr 14th, 09, 10:58 PM
blown70 blown70 is offline
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Default Re: thumper cams

A buddy of mine is building a sbc with a big mutha thumper roller.I can keep you posted on the dyno results.
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  #5  
Old Apr 15th, 09, 1:32 AM
Tom Mobley Tom Mobley is offline
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Default Re: thumper cams

marketing innovation, but under the hype is a cast iron roller cam. not recommended.
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  #6  
Old Apr 15th, 09, 5:40 AM
BillyGman BillyGman is offline
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Default Re: thumper cams

Quote:
Originally Posted by ABAD72 View Post
no matter what the tech guys at jeggs or sumitt will say,, the thumper cam is a cast iron grind, dont even think about it unless you order a steel one rite from comp.. I got 2 bad ones rite out the box, from sumitt... azz far azz performance goes -I cant tell a seat of the pants different from the stock zz4 cam i took out of my zz4,, I havent ran a 1/4 with it yet to tell if it is faster,,, but it does sound like a beast... here is a link video of the second bad one I got... comp actually eneded up makin me a steel one after the problems I had with sumitt bad cast ones..If I hadnt already had the matching valve train components in my heads already I would of went a different way..



http://s192.photobucket.com/albums/z...2_11_40_11.flv
Holy COW!!!!! I've purchased and installed cast iron cams before (not roller ones though) and I've never seen one like that! That's a very revealing video. That is downright freaky. Ofcourse shouldn't have anything to do with it being a Thumpr cam though.
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  #7  
Old Apr 15th, 09, 6:25 AM
Tom Mobley Tom Mobley is offline
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Default Re: thumper cams

Has to do with it being a CC cast iron roller though.
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  #8  
Old Apr 15th, 09, 7:55 AM
BillyGman BillyGman is offline
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Default Re: thumper cams

Quote:
Originally Posted by Tom Mobley View Post
Has to do with it being a CC cast iron roller though.
In light of what's been shared, it's difficult for me to argue with you on that point. So are we to conclude that this could've just as easily happened with a cast flat tappet cam? CC or otherwise? I'm thinking that the answer to that would be "yes". because if not, then what would be the difference? After all, the cam in question here was not even installed. All is I know, is I've had flat tappet cams from 3 different aftermarket cam companies, including CC, and I've never seen one like that. That's just plain weird.
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  #9  
Old Apr 15th, 09, 7:58 AM
66 BRONZE 66 BRONZE is offline
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Default Re: thumper cams

It's pretty sad when ANY cam company will let something like that go out their door.
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  #10  
Old Apr 15th, 09, 1:57 PM
Tom Mobley Tom Mobley is offline
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Default Re: thumper cams

yes it is.

google on cast iron roller, see what comes up.
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  #11  
Old Apr 15th, 09, 3:06 PM
kirkwoodken kirkwoodken is offline
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Default Re: thumper cams

With sand cast parts, which it looks like cast-iron cams still are, sand can imbed itself in the outside of the metal. When those parts are ground, the sand will be knocked out, leaving a hole. It's what happens constantly when maximum productivity/profit are the goal. The cores will be made with less metal to grind off, leaving a surface that may have more flaws. It's what any of us would do if we were in business. The problem is not catching it before it goes out the door.

What I also see on that cam is an indication that the grinding coolant is not well maintained, which leaves 'dirt' in the ground finish. Grinding coolants are cleaned by magnetic and settling tank methods, and sometimes with filtering methods: another labor intensive process that appears to make no profit. In my opinion, one of the things that set Isky apart from early cam grinders was the finish on their roller cams: almost mirror-like. No dirt there. You could tell by the finish you had a first class product.
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  #12  
Old Apr 15th, 09, 6:13 PM
ABAD72 ABAD72 is offline
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Default Re: thumper cams

And that was the SECOND!!!!!!!!!!!!1 one they sent me like that.
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  #13  
Old Apr 15th, 09, 6:21 PM
72sbc427 72sbc427 is offline
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Default Re: thumper cams

So those aren't suppose to be "wear indicators" like tires have? sad, so very sad
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  #14  
Old Apr 20th, 09, 7:48 PM
zeke67 zeke67 is offline
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Default Re: thumper cams

Almost hate to ask....how many cams like that do you think get installed by builders or DIY that don't care or don't know any better.
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  #15  
Old Aug 18th, 09, 7:22 PM
Farock72 Farock72 is offline
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Default Re: thumper cams

I installed a Mutha Thumpr in my 396 and all the lifters wore out in 45 minuts and i did all the recommendations with addatives and oil.Wore a grove staright through the lifter one had no bottom at all.Started it to break it in 5 minutes later started to tap bad.readjusted thought I made a mistake started again did the same thing started to tap.adjusted again and then ran for 20 min and wouldn't stay running due to the valves not openeing on cylinders 1 and 6.This was a hyd flat tappet.Now I have to remove entire engine and rebuild since there are tons of metal floating around my engine.Can't wait to see what other damage it done.Why don't they give us the option in paying for a billet cam?I e-mailed comp cams and guess what I am still waiting for a reply.
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