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02-25-2011, 07:04 PM
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#1 |
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Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
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"thumper cam"
Well it was news to ME.
I've never heard of this type of Camshaft. Supposedly theres a Stage 1, 2 & 3 Cam. Supposed to retard the timing during idle (up to 1K RPM) to give you a radicle, Rumpity Bumpity Idle, then after 1K RPM's, it goes back to the stock timing. I had never heard of this type of Cam before. Sounds like no more, do you have to "Pump Up" your engine to accept a loping Cam. I heard they were expensive though. I was told $500.00-$600.00???  Anyone else heard of/or had experience with one? I'd love to Hear/See a You Tube Video of one in action!
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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02-25-2011, 07:31 PM
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#2 |
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454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: "thumper cam"
I always loved them just for the names alone...
Thumpr, Mutha Thumpr & Big Mutha Thumpr......  Great sound they make as well.
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Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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02-25-2011, 07:37 PM
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#3 | |
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Registered User
 Join Date: Jan 2001
Location: Sabinal, Texas
Posts: 1,706
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Re: "thumper cam"
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02-25-2011, 07:42 PM
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#4 |
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Senior Member
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: "thumper cam"
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property"  "Be American, Buy American" 
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02-25-2011, 07:55 PM
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#5 |
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454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: "thumper cam"
__________________
Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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02-25-2011, 07:57 PM
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#6 | |
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Registered User
Join Date: Dec 2008
Location: Yay Area CA
Posts: 2,329
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Re: "thumper cam"
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1965 GMC shortwide big window 1969 Chevy C20 long (for now) 2005 Silverado 2500HD Crew Cab Quote:
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02-25-2011, 08:56 PM
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#7 |
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Senior Member
Join Date: Mar 2002
Location: Temple, Ga
Posts: 854
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Re: "thumper cam"
I have a big mutha thumpr in my 5.3. It sounds great but it doesn't make the most power and I doubt it will like the turbo very much.
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02-25-2011, 09:28 PM
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#8 |
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dazed and confused
Join Date: Jul 2008
Location: marion nc
Posts: 1,649
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Re: "thumper cam"
i have the big mutha thumper in my 70. sounds good i think. i dont have camera and i am not sure how to post a video if i get one. i like it though!
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members met: redbaron69, billsbowtie,nc67 |
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02-25-2011, 10:58 PM
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#9 | |
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Words under my name
Join Date: Nov 2010
Location: Lakewood, Washington
Posts: 181
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Re: "thumper cam"
Quote:
If you google Thumpr cam there are some youtube videos, sounds really cool and imo the names fit Posted via Mobile Device
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69 Chevy CST/10 "Project: Bloody Knuckles"  my slow going project.2010 VW Golf, daily driver Wrench Rookie |
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02-25-2011, 11:53 PM
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#10 |
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Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: "thumper cam"
I have 279 (small) thumpr, sounds great, Ive heard I could make more power with a diff. cam though.
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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02-25-2011, 11:58 PM
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#11 |
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Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: "thumper cam"
They are just designed to make noise. There are way better choices if you actually want to make power and not just a bunch of noise
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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02-26-2011, 12:58 AM
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#12 |
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Registered User
Join Date: Dec 2007
Location: Modesto, Ca
Posts: 411
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Re: "thumper cam"
^^^^^^
Agreed. They just tend to have a narrow lobe separation angle causing a rough idle. They do sound good though. |
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02-26-2011, 01:15 AM
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#13 |
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Registered User
Join Date: Mar 2002
Location: Forney TX
Posts: 4,512
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Re: "thumper cam"
Thay sound good but if you build your motor right you will match everything and even a small cam sounds big. But a motor with matching stuff will perform better then a cam like these. If you want the sound only great but you want something to back it up get a topend kit.
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Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274 |
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02-26-2011, 04:30 AM
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#14 | |||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,921
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Re: "thumper cam"
Quote:
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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02-26-2011, 08:48 AM
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#15 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: "thumper cam"
thumper cams are good for posers who would otherwise soil thier underware if faced with driving a true performance engine
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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02-26-2011, 09:21 AM
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#16 | |
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454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: "thumper cam"
Quote:
__________________
Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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02-26-2011, 10:03 AM
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#17 |
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Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: "thumper cam"
Im a poser
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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02-26-2011, 10:09 AM
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#18 |
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Account Suspended
Join Date: Oct 2009
Location: Sammamish, WA
Posts: 2,404
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Re: "thumper cam"
A CompCams Thumpr cam is just a cam that has more overlap ground in than would be typical at a given performance level. So it's a streetable cam that sounds like a "race" cam with a rumpty idle.
You give up some level of power, low-and mid-range driveability and fuel economy for a rumpty idle. If you *have* to have the sound, it's a way better way to get it than to actually run a "too big" cam. I "did the math" on the post below to show why Thumprs do what they do... http://67-72chevytrucks.com/vboard/s...9&postcount=18 Last edited by Ticker; 02-26-2011 at 10:10 AM. |
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02-26-2011, 01:39 PM
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#19 |
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Registered User
Join Date: Mar 2002
Location: Forney TX
Posts: 4,512
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Re: "thumper cam"
Good read ticker
__________________
Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274 |
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02-26-2011, 02:09 PM
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#20 | |
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Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
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Re: "thumper cam"
Quote:
Remember High School? 
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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02-26-2011, 02:12 PM
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#21 | |
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Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
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Re: "thumper cam"
Quote:
It was strickly the "sound effect" you get at idle. If my engine wasnt so tired, I'd consider putting in one of these.
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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02-26-2011, 02:29 PM
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#22 | |
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Registered User
Join Date: Nov 2010
Location: Venus Texas
Posts: 217
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Re: "thumper cam"
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02-26-2011, 09:05 PM
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#23 |
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Account Suspended
Join Date: Oct 2009
Location: Sammamish, WA
Posts: 2,404
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Re: "thumper cam"
All engine designs are the result of the goals of the owner, and are always a compromise to some extent. There's nothing wrong with a Thumpr any more than there is with dual quads on an engine that will never see more than 5,000 RPM. I personally like the sound of a well-tuned engine that can deliver what it promises, but I can understand the desire for a race idle for fun and enjoyment.
Everyone has different tastes...and that's what makes this truck stuff fun 
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02-27-2011, 09:57 PM
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#24 |
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Registered User
Join Date: Dec 2008
Location: Pleak, Texas
Posts: 420
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Re: "thumper cam"
I just built a 350 bored .030 over with flat-top pistons and a thumpr cam. I've got 72cc Summit Racing cast heads on it with a stock cast intake and a Quadrajunk. It'll more than back up the lopey idle. It runs like a raped ape and will smoke the snot out of the tires from a standstill. Of course I'm running a 3-speed with 3.08 gears and not a power robbing automatic. (If you haven't noticed, I HATE automatics. More stuff to go wrong and they take all the fun outta driving). The only problem is tuning it for peak performance. Initial timing at 12* BTDC works well for me with an orange spring under the power piston. Still having problems when the secondaries kick in though. Runs great for 3 seconds then falls flat on it's face. I'm to the point to where I'm just going to chunk the Qjet and bolt on a Holley. My neighbor has one just sitting in his barn, so I figure why not. You can't beat free. Just thought I'd voice my opinion since everyone is entitled to their own.
Take it for what it's worth. Like someone once said, you don't know until you try.
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-1967 Chevrolet Fleetside LWB- 350 V8 w/thumpr cam, NV3500, 3.08 gears, A/C, PS  -1983 Chevy Silverado C1500- 383 stroker, TH400 -1989 Chevy Silverado K1500 SWB- 5.3L swap, 700R4, 3.42 gears -And a '66 Ford Mustang- 200 I6, C4 trans, rust bucket "The only thing we have to fear is fear itself." -FDR (and maybe rust too) You've gotta be able to stop and steer before you can go fast! |
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04-05-2011, 08:28 PM
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#25 | |
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Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
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Re: "thumper cam"
Quote:
if you had any of these 3 Cams installed , and lets say you got stuck in Stop-n-Go Traffic, would your engine "Load-up" like it would with a "Built" engine? Also lets say you were doing 80 mph and let your foot off the gas and came to a fast/controlled stop, would the engine "Die" on you, being that the idle is so radicle?
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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