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Old 05-23-2013, 01:56 PM
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Are thumpr camshafts really not good for power?

apparently everyone loves the sound of a thumpr camshaft but are the thumpr camshafts really all noise and no action or dont make alot of power?

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Old 05-23-2013, 02:05 PM
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Here is my knowledge. They do make decent power but they are made more for sound then the best performance. I have seen several dyno tests with the roller versions and they are not bad but the comp xtreme energy line is way better along with lunati voodoo cams. I once had the big mutha thumpr roller version and it was the worse cam I ever had as it sounded nice but ran horrible as it has a lot of overlap and I only had 6 inches of vacuum in park and way less in gear and that thing was a pain to get timing set up and carb to work with etc. The thumper cam is the least of the series and it can be made to work but if it was me I would go with something that I mentioned about above as you will not get only better vacuum but also better performance with out all the overlap those cams have and better duration number without being so far off.
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Old 05-23-2013, 02:11 PM
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I agree with what Eric said. While you can make "decent" power with such a cam, you can make more power in the same package with a camshaft that is chosen to make power, not rump-rump.
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Old 05-23-2013, 02:57 PM
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I have had two for my SBC's. Good power in the middle and top end. Both were Big Mutha Thumprs.
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Old 05-23-2013, 06:51 PM
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Quote:
Originally Posted by demarques_191 View Post
apparently everyone loves the sound of a thumpr camshaft but are the thumpr camshafts really all noise and no action or dont make alot of power?
If you want action to go with the beat of the Thumper you've got to run the compression up. Get the cam's timing specs and your compression specs, rod and stroke lengths then get on somebody's DCR calcualtor, Keith Black has a good one. You want that number to hit somewhere between (8 to 8.5) to 1 for cast iron and you can maybe push that (8 to 9) to 1 with aluminum heads.
Then this cam really wakes up.

Bogie
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Old 05-23-2013, 07:34 PM
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Ive got the middle of the road "Mutha Thumpr" in my SBC. Ive got to say its a dog down load. But 3K rpm and up it comes to life. This cam is in a stock compression small block. Im in the process of changing that came out for a much smaller cam with a lower lsa.
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Old 05-23-2013, 10:10 PM
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I agree with F bird. If you were serious about making power, why go with a hydraulic? Your basic solid single pattern cam , sounds serious ,and has great return on power.
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Old 05-23-2013, 11:49 PM
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the camshaft needs to be chosen for the application. specs match your engine,not a funny name that works in everything.Its not black magic anymore,just some math
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