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Thread: cam question?????

  1. #1
    Senior Member SENIOR BUILDER
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    cam question?????

    quick question does the duration of o cam decide torque and horse power??? lets say if you have a cam (solid roller) with a lift of .714/.710 with a duration of 299-310 does it have less torque but more hp than lets say a cam of the same liift but a duration of 315-327? thanks for the clearing up you guys are great help for us rookies!
    if something goes wrong there is always the cooler!!!

  2. #2
    Senior Member RACING JUNKIE
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    There's far too many variables to take into consideration.

    Advertised duration numbers aren't used much. The duration numbers at .020 and .050 are more precise.

    That's why it's always best to pick a cam company you like and work with them to develop a custom cam for your application.

    Sometimes it'll be a common combination and they'll have a shelf cam that will work. Sometimes it won't, and they can custom grind a cam for you.
    -WJ Birmingham

    OneBadGMC.com

  3. #3
    Senior Member EXPERT BUILDER
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    lets just say your talking a bbc cam.if you do nothing but keep the valves open longer you will move your power curve higher in rpm.but the down side is sometimes by doing that you give up torque.

    are you trying to figure out a cam for a particular combo?

  4. #4
    Senior Member RACING JUNKIE oldandtired's Avatar
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    Don't forget overlap. Controls the temperment of the cam.
    dave
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triumph of evil is for good men to do nothing" Edmund Burke

  5. #5
    Senior Member SENIOR BUILDER
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    that all makes alittle more sense now to get really what you need u need to take everything your motor is and then build your cam and russ that was what i was tring to figure outthank you guys
    if something goes wrong there is always the cooler!!!

  6. #6
    Senior Member RACING JUNKIE
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    there are alot of cam companies to buy from and most of them can tell
    you what you need when he knows what you want it for, when i orded
    my first cam i did not know what i wanted but told him what i had
    and what i was going to use it for and i got a real good cam that
    had a good response and a lumpy sound and that was the late
    chet herbert, he would actualy answer the phone and tell you
    the numbers on the phone, he was a good guy, RIP :wink:
    i was 16 at the time now im 47 i like the idea of roller
    cams, less friction :wink:

  7. #7
    Senior Member RACING JUNKIE
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    I think the biggest advantage of a roller is they can have a much more aggressive profile...they can snap the valves open much quicker than you can with a flat tappet.I'm no cam guy I let the experts pick mine for me...the main thing is be completely honest with them in the description of the car/engine and your application.Give them as much ACCURATE information as you can. Especially the compression ratio...don't guess, KNOW what it is, or will be. JUST MY OPINION

  8. #8
    Senior Member SENIOR BUILDER
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    so if the cam i have is not working quite well for me(came in motor i bought) is it better or cheaper to have it ground for my application or to get a new one made
    if something goes wrong there is always the cooler!!!

  9. #9
    Senior Member RACING JUNKIE
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    Is it a solid roller? Those Can be reground sometimes but I have never heard of a flat tappet being reground....they are cheap anyway.

  10. #10
    Senior Member SENIOR BUILDER
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    yeah its a herbert solid roller
    if something goes wrong there is always the cooler!!!


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