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b20vtec compression

Discussion in 'Engine Building' started by brian11to1, Nov 13, 2008.

  1. brian11to1

    brian11to1 Senior Member

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    Someone please help me figure out my compression...

    I'm building an 84.5mm B20VTEC.

    B20B Block
    LS/B20 Rods
    LS/B20 Crank
    84.5mm RS ITR pistons
    3 layer OEM headgasket
    Supertech flat "race" valves
    GSR head which has ported/polished will flow right around 280-285cfm

    Can anyone help? I've heard numbers all the way from 11:1 to 13:1, I just really wanna know.
     
  2. xips(86CRXSI)

    xips(86CRXSI) New Member

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  3. brian11to1

    brian11to1 Senior Member

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  4. xips(86CRXSI)

    xips(86CRXSI) New Member

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  5. brian11to1

    brian11to1 Senior Member

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    Ya, 13.5 and everyone I talk to says thats not even close to being accurate. Since I guess the calculator still assumes the pistons are 81mm going into an 84.5 bore.

    I didnt say its wrong as a fact, I expressed an opinion about it possibly being wrong
     
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