RV Camshft Selection - Page 2 - Off-Road Forums & Discussion Groups
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post #11 of (permalink) Old 03-28-2001, 12:19 PM
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Re: RV Camshft Selection

Scott

If you want , grab the file I attatched , it sorts out some cam guidelines. Pay close attention to the RPM/TORQUE ranges .

Jeff



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post #12 of (permalink) Old 03-28-2001, 12:54 PM
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Re: RV Camshft Selection

Unfortunately, no cam card comes with stock replacement cams. I did find a site that gave stock specs though. For the Buick 181, 196, 231 & 252 V-6's, the duration at .050" lift is 187 degrees for intake and 194 degrees for exhaust. Valve lift of .374" for intake, .384" for exhaust. For the Buick 350 V-8, 191/208 .050" duration and .387"/.403" valve lift.

Remember most all of the builders involved in racing are in tune with what works for racing, but are usually not aware of what's best for general and off-road driving that warrants low-end torque that's fully in around 2500 rpm. The manufacturers did a pretty good job of finding the best of everything for the majority of us and did quite a bit of r&d to come up with it.

Tim
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post #13 of (permalink) Old 03-28-2001, 03:51 PM
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Re: RV Camshft Selection

Hey I dont know if they have this at the marine shops around you guys for the AMC motors...but I use a marine cam...they cost more due to the fact that they patented from Mercruiser, etc...but they starting RPM in these cams is about 500 RPMs! and top out about 4500-5000 RPMS...they are the real stump pulling-axle snappin'-tire smokin'-driveshaft twisting motor mount 'popin' bumpsticks...I even told my tow truck friend about them and Ive gotten two free tows from him he was so happy(both times snapping the model 20 axles=5 total...HEHE)...just my thought and insight

MARK (OIIIIO) LANGMOTORSPORTS
1977/CJ7/GLASSTUB/460CIFORD/C6AUTO/4"LIFT/33'S
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post #14 of (permalink) Old 03-28-2001, 06:21 PM
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Re: RV Camshft Selection

The other side of the equation, is how each cam manufacturer measures there cam. Numbers mean little between different manufacturers due to various methods of measuring. They should be good for comparing one manufactures offerings. To maximize HP, try to optimize lift.

Enjoying Montana's Big Sky & Snow(Skiing that is)
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post #15 of (permalink) Old 03-28-2001, 11:39 PM
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Re: RV Camshft Selection

I tend to ignore top HP figures in lieu of comparing torque figures. Even if the torque of one engine is greater than another, the other might have more usable power due to what the torque is on each motor at a normal operating range of 2500 rpm and below. Low-end grunt is the usable power that I look for since I don't race, mud-bog or sand drag.

Tim
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'70 Wagoneer w/Buick 350 V-8
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