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Old 01-30-2009, 06:38 PM
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Blue Racer vs. Thumpr

Im in the market for a new cam, I just want a change from last year. Im looking for more power (obviously) and a rougher sounding idle, because who doesnt want that?
The cam I am currently running is a Blue Racer 280-2H, PN: wg1159k. This cam has worked really well, except not being able to pass the local smog test. I would like to know if I would see a definite gain if i went with a Comp Thumpr 279T H-107 or a 287T H-107, although i have my doubts that my engine can support the 287T.
Engine specs:
-Chevrolet 350 (010)
-GM 1.94 heads (non camelhump)
-Flat tops w/four valve releifs
-Wiend Stealth Intake manifold
-Holley 650 vac
-Shorty headers w/ single 3" exhaust into flowmaster muffler out dual 3" tailpipes (F-body)
-T-5 5speed
-3.73 gears
-weight w/driver is 3360lbs

Like i said, the current cam runs pretty good but i dont really like the smooth idle and im looking for more power, open to suggestions.

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Old 01-30-2009, 06:52 PM
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ok heres what i did i bored out my 350 in my 79 gmc .60 over i got some 1.02/1.60 62cc double camel hump heads and a steel crank with some flat top pistons a edlebrock rpm performer gap intake and a 850 holley carb the rockers a 1.6.1 spark plugs are diamond fire hotter spark headers are from hooker got them painted white oh yea and the cam well is form comp cams 292h oh yea almost for got i horrible on gas i have 120 octane dont ask where i get it i'm making 535 horse took it out of the truck builf a much milder one and that engine is now in my dads 78 z28 camaro behind a m22 rock crusher 12 bolt rear with 4.10 gears runs pretty hot tho dont stay in one spot for long so if you looking for serious power build something along those lines.
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Old 01-30-2009, 07:46 PM
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thanks for the tip. Im aware of all the things i could do to make serious power, thats not what im after. i just want to know if i might see any significat gains by changing cams. I realize i will have to use different springs, but other than that im not into changing anything else, i have a "serious power" project, this one isnt it.
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Old 01-30-2009, 07:50 PM
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H-107 i've used that one pretty sure you could see a good gain in power throttle respose and the sound would be there
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Old 01-30-2009, 09:27 PM
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ive been meaning to ask about thumper cams
whats the general feeling on these .
do they make good power or are they just about rough idle
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Old 01-31-2009, 12:25 PM
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Quote:
Originally Posted by automods
Im in the market for a new cam, I just want a change from last year. Im looking for more power (obviously) and a rougher sounding idle, because who doesnt want that?
The cam I am currently running is a Blue Racer 280-2H, PN: wg1159k. This cam has worked really well, except not being able to pass the local smog test. I would like to know if I would see a definite gain if i went with a Comp Thumpr 279T H-107 or a 287T H-107, although i have my doubts that my engine can support the 287T.
Engine specs:
-Chevrolet 350 (010)
-GM 1.94 heads (non camelhump)
-Flat tops w/four valve releifs
-Wiend Stealth Intake manifold
-Holley 650 vac
-Shorty headers w/ single 3" exhaust into flowmaster muffler out dual 3" tailpipes (F-body)
-T-5 5speed
-3.73 gears
-weight w/driver is 3360lbs

Like i said, the current cam runs pretty good but i dont really like the smooth idle and im looking for more power, open to suggestions.
It seems like your real problem is passing a smog test, to that end, a rougher idling cam will be of no help. The higher performance capability of the cam the greater amounts of overlap will be used as well as a later closing intake. These are functions that are antithetical to low emissions.

So if you can't pass the local smog test what happens? In Washington state, which uses California law on the subject, if you have a modified vehicle that fails a SMOG test, you can't get the vehicle licensed for the street unless and until the engine can pass a test and corrections have been performed by a SMOG certified shop or the vehicle has been returned to it's original emissions certified configuration and can pass a test.

More cam seems to having barking up the wrong tree.

Bogie
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Old 01-31-2009, 03:08 PM
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If I was you stay away from the thumpr cams whether its flat tappet or roller. I have the Big mutha thumpr roller version and its coming out either this summer or fall time. Those cams will make some decent power and torque but they have a lot of overlap for the sound and you will have a lot of problems getting your timing right along with your engine to combust good. If you want a better sounding cam and get better horsepower and torque go with something from compcams extreme energy cam line. They will give you about an average of 15 or more hp then the thumpr cams. Go with the extreme energy comp cam with 218/224 @ 50 duration and you will get a slight lopey idle and still have good vaccum and be a good daily driver. That is the one I am going to use for my current build.
Eric
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