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B17 Crank into LS

Discussion in 'Engine Building' started by 22crazy, Feb 2, 2003.

  1. 22crazy

    22crazy Senior Member

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    is there a way to calculate the displacement using the stroke, bore, rod lenght? oh yah what about putting in a b17 crank into an ls...would that help to rev higher...and what are the draw backs
     
  2. lsvtec

    lsvtec GNU/Linux Evangelist

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    Please start your own threads.

    Yes, if you know bore and stroke you can calculate displacement.
    Displacement in cc's (divide by 1000 to get liters) = r^2 * 3.14159 * stroke (in centimeters) * 4
    r = 1/2 the bore in mm * 10
    Yes, you can run a B17 crank in an LS engine, you lose displacement.
     
  3. K2e2vin

    K2e2vin Senior Member

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    simpler way to say it- pi(r^2)s*cylinders=displacement
    convert to cm (for mm to cm, move decimal one to the left), r=.5*bore, s=stroke

    if you are using custom rods or something (shorter rods) deck height-.5s-rod=x
    replace the s with the x in the formula above and add that to the answer you got.

    ex: b18c block, b18c rods, b17 cranks;
    3.14(4.05^2)8.14=419.4cc per cylinder, 1677.6cc total
    18.15-(8.14*.5)-13.79=.29cm; 3.14(4.05^2).29=14.94cc per cylinder, 59.76cc gained
    1677.6+59.76=about 1737cc total; 1.7L

    p.s. because of the extra space the compression ratio will be lower also.
     
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