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Old 01-11-2012, 02:57 PM
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Sbc Thumper Cam

What are your thoughts in these cams? why do some ppl not like these cams or think they don't make any good power for a street/strip motor??? I bought a BIG MURTHA THUMPER cam when they first hit shelves for my sbc385 and at the strip on all motor I ran decent 11.70 in the 1/4 consistent on the street it was a beast still had upgrades to do at the time for improvement but never went back to the strip.

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Old 01-11-2012, 04:38 PM
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Cam companies are like beer. Lots of opinion and sit seems cool to beat up on Comp these days. Obviously you have to do things to make the cam optimum in an engine but the basic Thumper gives a guy without the bucks to do lots of stuff the ability to have an engine worhty of a street rod.....and I don't think there's any thing wrong with that. This particluar engine is 505CID with reworked oval port heads and a Scat forged bottom end. It has a BMT hyd. roller and hearing it run on the stand puts a huge grin on my face...and it will be more than respectable in the 55 Chevy PU it's going in. But like I said in the beginning.....Just an opinion and by the way....Miller Lite
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Old 01-11-2012, 05:06 PM
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Quote:
Originally Posted by speedbump
Cam companies are like beer. Lots of opinion and sit seems cool to beat up on Comp these days. Obviously you have to do things to make the cam optimum in an engine but the basic Thumper gives a guy without the bucks to do lots of stuff the ability to have an engine worhty of a street rod.....and I don't think there's any thing wrong with that. This particluar engine is 505CID with reworked oval port heads and a Scat forged bottom end. It has a BMT hyd. roller and hearing it run on the stand puts a huge grin on my face...and it will be more than respectable in the 55 Chevy PU it's going in. But like I said in the beginning.....Just an opinion and by the way....Miller Lite
lol at miller lite
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Old 01-11-2012, 05:18 PM
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The way they market it as being more about the "choppy" idle sound doesn't help. So many people think an idle like that means big power but in my experience it usually sacrifices low end power. I get a kick out of people that think bad idle means power, my old boss heard my yet to be tuned 305 Chevy and thought it had a radical cam in it.
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Old 01-11-2012, 05:26 PM
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Quote:
Originally Posted by 455olds
The way they market it as being more about the "choppy" idle sound doesn't help. So many people think an idle like that means big power but in my experience it usually sacrifices low end power. I get a kick out of people that think bad idle means power, my old boss heard my yet to be tuned 305 Chevy and thought it had a radical cam in it.
YES AGREED PPL THINK BCUZ IT SOUNDS GOOD IT RUNS GOOD BUT WHEN I BOUGHT MY CAM I DIDNT HEAR ANYTHING ABOUT IT OR ASK ABOUT I SIMPLY WANTED A ROLLER RETRO FIT CAM AND THAT WAS NEW ON THE MARKET SO ME WITH MONEY TO WASTE AT THE TIME SMH I BOUGHT IT BUT FOR HOW MILD IT WAS IT SURPRISED ME WHEN I SEEN A 11.70 TIME ON THE JUMBO SCREEN AT THE STRIP I THOUGHT MABE I WOULD RUN A MID 12
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Old 01-11-2012, 06:14 PM
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The Thumper line of cams were designed to give off an aggressive sounding idle, period. Little did Comp Cams know that soon enough, some of the guys had those cams at the track and they put up some really good numbers. Your 11.70 is proof. An ET like that will stomp about 99% of the cars out there.
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Old 01-11-2012, 06:32 PM
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Quote:
Originally Posted by joelster
The Thumper line of cams were designed to give off an aggressive sounding idle, period. Little did Comp Cams know that soon enough, some of the guys had those cams at the track and they put up some really good numbers. Your 11.70 is proof. An ET like that will stomp about 99% of the cars out there.
YES BCUZ I KNEW DITTO ABOUT THE PERFORMANCE OF THE CAM BUT AT THE SAMETIME I DID MY HOMEWORK ON MY PARTS/DRIVETRAIN TO MAKE SURE EVERYTHING MATCHED UP PROPERLY I ALSO HAD A SET OF OUT THE BOX AFR 195 ELIMINATORS TOO THAT HELPED GET THAT ET
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Old 01-14-2012, 11:28 PM
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These Thumper-style cams are nothing new... Chet Herbert ground cams that sounded like that back in the 50's....

Didn't work then... don't work now. If you did an 11.70 WITH that cam you'd probably do an 11.50 with a real camshaft.

Just my over-rated opinion....
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Old 01-15-2012, 11:15 AM
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Quote:
Originally Posted by krooser
If you did an 11.70 WITH that cam you'd probably do an 11.50 with a real camshaft
^times 2.......
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Old 01-15-2012, 01:55 PM
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It would be nice to see some of the iron you guys build that give you such a strong opinion on this line of camshafts. There is some marketing involved, but lift/duration numbers and lobe profiles don't lie. Kind of like at the track but no one lives anywhere near close enough to have a shootout.
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Old 01-15-2012, 03:27 PM
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Quote:
Originally Posted by speedbump
It would be nice to see some of the iron you guys build that give you such a strong opinion on this line of camshafts. There is some marketing involved, but lift/duration numbers and lobe profiles don't lie. Kind of like at the track but no one lives anywhere near close enough to have a shootout.
You know, it's not so much about the cam timing that urks me, it's the attitude of a fellow who would use such a cam to make the motor sound like a race motor. Us old guys just laugh at 'em. To me, it's a poser trying to get away with something, rather than building the genuine article.
Just because a motor goes RUMP-RUMP does not mean that it makes any power. Maybe when you get to my age and have the experience that I and others on this board who detest those poser cams have, your attitude will be a little different too.
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Old 01-15-2012, 05:05 PM
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I appreciate the complement, but I've been getting my social security check for a while now. Maybe just have a younger idea of what fun is. I can't see much difference between putting a little bit of lump in an engine for a street rod than putting "smitties" on your old Ford....or splitting the exhaust manifold on your old Chevy 6 banger....or for that matter putting the chrome tips on that dual exhaust.....or saving up to buy that set of baby moon hubcaps. Maybe when I get the differences under control....I can get on the board.
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Old 01-15-2012, 05:13 PM
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Quote:
Originally Posted by speedbump
I appreciate the complement, but I've been getting my social security check for a while now. Maybe just have a younger idea of what fun is. I can't see much difference between putting a little bit of lump in an engine for a street rod than putting "smitties" on your old Ford....or splitting the exhaust manifold on your old Chevy 6 banger....or for that matter putting the chrome tips on that dual exhaust.....or saving up to buy that set of baby moon hubcaps. Maybe when I get the differences under control....I can get on the board.
I yield to your argument sir.
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Old 01-15-2012, 05:24 PM
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I just don't understand the hatred towards these camshafts. I race here and there but I also hit up our local cruise nights all the time. The Thumpr line of camshafts are tailored PERFECTLY for the cruise night crowd. They are for the guys who cruise their cars and want to rumble into the parking lot but have little interest of heading down the track. So many people want to nit-pick these camshafts and claim that a better cam would knock off .2 seconds, lol. So what? I'm sure I could nit-pick the ENTIRE build and swap parts here and there to shave some ET. So what if the cam isn't optimal for going down the 1/4 mile. That's not what it is intended for.

Funny thing is that they do make decent power!
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Old 01-16-2012, 05:59 PM
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I installed one of those Thumper cams in my friend's 350 Chevy last year. I was skeptical that anything designed to just sound good would really perform. His 350 is fairly stock, with just aftermarket intake, Edelbrock 650, and a set of headers.
On startup I was really impressed with how great the cam sounded, and they really did get that part right. After breakin we took the car for a spin, and it couldn't even break a pair of 275/60/15 tires loose. The car's stock cam would easily bust the tires loose before.
Headed home and tried all sorts of timing adjustments and test drives. Also tried some jetting changes, but Eddys aren't fun to change jets like a Holley is. We eventually got it to run good enough to get a litle ture spin, but it's still a dog.
I'm not sold on them, and they are just what I thought they might be; all bark and no bite.
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