Comp ratio calculations for the Wizard

Discussion in 'Street/strip 400/430/455' started by Bills72stage1, Apr 21, 2018.

  1. Bills72stage1

    Bills72stage1 Well-Known Member

    I am trying to down load a DCR Calculator with no success.
    My eng is a 70 block 455 bbb
    I have KiethBlck hyper tech pistons pn KB357 step dish design
    Bore is 4.3425(.030overbore)
    Comp HT 2.010
    OE Deck HT 10.570
    SD 26.7 cc
    Head cc 64 ta Stg 1 alum
    Comteck gsk .027 4.350
    Cam TA 288-92h
    Degree at. 105.5 in opening at 9 degrees btdc closing at 40 degrees abdc at .050
    Ad duration intake 288 in 292 ex actual on degree wheel at 0.050 in 229 ( 231 on card) 233 ex (233 on card)
    My calculation are 288/2=144-105.5=38.5. 288-180=108-38.5=69.5
    Can you help me and run the numbers through your DCR Calcultor and give me comp ratio and scr
    Thank you I would love to have this calcultor on my computer but cannot get it to open lol
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Sure Bill,

    Not sure if your machine shop did a clean up cut on the deck? 1/2 stroke + rod length + compression height = 3.9/2 + 6.6 + 2.01 = 10.56. With true 0 deck,

    Bill1.JPG
    Cam timing,
    Bill2.JPG
    Dynamic Stroke length,
    Bill3.JPG
    DCR,
    Bill4.JPG
     
    britt'sStage 1 and Julian like this.
  3. Bills72stage1

    Bills72stage1 Well-Known Member

    Thanks for running the numbers for me. Bill
     

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