Need cam advise - Team Camaro Tech
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post #1 of 6 (permalink) Old Nov 16th, 05, 06:42 PM Thread Starter
 
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Need cam advise

I am in the process of building my 426 sbc. I have everything except for the camshaft. I will be using Prochargers D1-R supercharger and a 950 carb. I am puzzled by what cam I should use, I have no experience with a centrifugal supercharger. I would like maximum power below 7000 rpm so am leaning toward a hydraulic roller. Would the cam need to be ground closer to a turbo spec due to the design of the supercharger, or would a standard forced induction "roots" blower cam work? My heads are AFR 227 cnc. Thanks for any light you might shine my way.
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post #2 of 6 (permalink) Old Nov 17th, 05, 01:25 PM
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Don
 
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Re: Need cam advise

Call cam manufacturer.

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #3 of 6 (permalink) Old Nov 17th, 05, 06:39 PM Thread Starter
 
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Re: Need cam advise

Thanks for the advise.
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post #4 of 6 (permalink) Old Nov 18th, 05, 06:57 AM
 
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Re: Need cam advise

Don't know exact lift or duration but one little bit of advice I have heard is on supercharged engines that you want to stay away from cams with overlap on the intake and exhuast lobs. The overlap helps in the sense that the fleeing exhaust gases create a vacume and pull in intake charge, with a supercharger you no longer need this as you are pushing in the air so the overlap only creates a loss in pressure and wasted air/fuel. That is my .02.....

Keith
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post #5 of 6 (permalink) Old Nov 18th, 05, 10:46 AM Thread Starter
 
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Re: Need cam advise

Quote:
Originally Posted by ktaylor36
Don't know exact lift or duration but one little bit of advice I have heard is on supercharged engines that you want to stay away from cams with overlap on the intake and exhuast lobs. The overlap helps in the sense that the fleeing exhaust gases create a vacume and pull in intake charge, with a supercharger you no longer need this as you are pushing in the air so the overlap only creates a loss in pressure and wasted air/fuel. That is my .02.....

Keith
Thanks for the reply. I understand why a roots style blower requires less overlap I just was not sure if a centrifugal blower would work with the same cam. After futher research I understand a turbo cam and blower cam are completely different animals. I understand a turbo cam requires more lobe seperation than a blower cam due to increases exhaust back pressure.
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post #6 of 6 (permalink) Old Nov 18th, 05, 04:02 PM
 
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Re: Need cam advise

Quote:
Originally Posted by BDS 502
Thanks for the reply. I understand why a roots style blower requires less overlap I just was not sure if a centrifugal blower would work with the same cam. After futher research I understand a turbo cam and blower cam are completely different animals. I understand a turbo cam requires more lobe seperation than a blower cam due to increases exhaust back pressure.
I would think a roots and centrif should need the same type of cam.. In the end they both do the same thing, run off the engine pullies, force air into the engine, and do nothing to scavange the exhaust. A turbo runs on the exhaust so I can see that messing up the lobe seperation. But after you get past the differences in how the roots and centrif work they are both the same type of beast.. IMO at least...

Keith
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