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Cams

Discussion in 'Street/strip 400/430/455' started by KRD, Dec 1, 2003.

  1. KRD

    KRD Well-Known Member

    Can someone explane to me what the duration, lift, and all that stuff about cams. Like what they mean and how they affect your engine.
     
    KRD, Dec 1, 2003
    #1
  2. GSXMEN

    GSXMEN Got Jesus?

    Zak - Below is a link to Crane Cams FAQ page on cams & valve trains. It's just the basics, but should give you a better idea.

    Crane Cams
     
    GSXMEN, Dec 1, 2003
    #2
  3. KRD

    KRD Well-Known Member

    thx, if i have any questions i will be back.
     
    KRD, Dec 1, 2003
    #3
  4. KRD

    KRD Well-Known Member

    Ok, so what in a cam gives you a rough or choppy idle? And is the lift what makes a cam big. Can someone give me specs for a cam that has a choppy idle and one of a big cam? Or are they the same.


    thx
     
    KRD, Dec 2, 2003
    #4
  5. 87GN_70GS

    87GN_70GS Well-Known Member

    Overlap. In a BBB, anything over ~13-15 deg overlap ( @ 0.050" tappet lift) can give you a rough idle. 20 deg overlap or larger will give you a choppy idle. Big overlap is gotten by close (narrow) lobe separation angles (LSA, or lobe centers, LC), or lots of duration, or both.

    No, but it makes for a high lift cam. But when someone says "I've got a big cam", they usually mean duration, because that's the parameter than will mainly govern the engine's characterisitc properties. How big is big: Street car big or Top Fuel big?

    Anything equal to or larger than TA's 238 deg @ 0.050" intake/ 248 deg @ 0.050" exhaust on 112 deg LSA will give you a rough-to-choppy idle. It has 19 deg of overlap: [(238+248)/2 - 2*112] .
     
    87GN_70GS, Dec 3, 2003
    #5
  6. 87GN_70GS

    87GN_70GS Well-Known Member

    I don't think getting a cam with a choppy idle just for the sake of having a choppy idle or being able to say "I've got a big cam" is the best strategy. You can achieve lots of goals with a cam that doesn't have a choppy idle.
     
    87GN_70GS, Dec 3, 2003
    #6

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