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Stroker Kits

Discussion in 'General Tech and Maintenance' started by civic_ferio, Apr 5, 2003.

  1. civic_ferio

    civic_ferio Junior Member

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    hi. i was just wondering how does it work? can you cange the displacement just by changing the crank shaft?
     
  2. Slo86GT

    Slo86GT Super Moderator

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    it's all about the math.

    If you increase the stroke on the crank, the piston will push further upward, so you either:

    A: get a shorter rod and shoot the rod/stroke ratio to shit

    or

    B: Move the wristpin in the piston upward, possibly causing oil management or compression issues.

    It's really a tradeoff, but alot of companies are making some nice stroker kits now for B series cars that have a decent Rod/Stroke ratio, while they increase displacement .1-.2 liters.
     
  3. civic_ferio

    civic_ferio Junior Member

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    so you can just increase the displacement of the engine without reboring it?
     
  4. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Yes, but at the cost of a lot of those stroker kits on the market, it might be cheaper (or the same price) to bore out larger and run custom pistons. Your engine will be stronger with a new sleeve built to handle the larger bore too.
     
  5. K2e2vin

    K2e2vin Senior Member

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    heres the equation for displacement: (B/2)²*pi*S B=Bore, S=stroke. if you change the stroke, the total would be greater.

    ie. B16a2.. (8.1/2)²*pi*7.7= 397.78*4 (for 4 cylinders)= 1587cc
    r/s= 1.74
    throw in a b17 crank... (8.1/2)²*pi*8.14=419.45*4= 1678cc
    your r/s ratio will decrease though, r/s= 1.62 (this is still pretty good)
    or you can change the bore.... b16a2 84mm rebore=
    (8.4/2)²*pi*7.7=426.72*4= 1707cc, you get same r/s ratio but more displacement.

    combine them... b16a 84mm rebore, b17 crank=
    (8.4/2)²*pi*8.14=451*4= 1804cc
     
  6. saturn_boy96

    saturn_boy96 88 C1V1C 53D4N DR1V3R

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    how are you getting the rod to stroke ratio?
     
  7. NoJokE

    NoJokE Senior Member

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    why do you represent bore as 8.1 and stroke as 7.7?
     
  8. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Know the rod lengths, divide by stroke length. :)
     
  9. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Centimeters... since we calculate displacement as cubic centimeters, not cubic millimeters. It's just easier to start with the right measurement scale than try to convert it later and get confuzzled.

    :lol:
     
  10. K2e2vin

    K2e2vin Senior Member

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    :werd: :withstupid:
     
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