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PR-3 Rods in B20b Vtec motor

Discussion in 'Engine Building' started by khai_tuan_nguyen, Oct 8, 2004.

  1. khai_tuan_nguyen

    khai_tuan_nguyen Senior Member

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    What car did the PR-3 piston rods come from? Also is it possible to use with aftermarket pistons in a crvtec?
     
  2. khai_tuan_nguyen

    khai_tuan_nguyen Senior Member

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    Is it compatible with aftermarket pistons in a b20 vtec? Does it need to be machined?

    Thanks
     
  3. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    No- you would need really tall compression height pistons to get that to work with a usable compression ratio. The rods are too short for an LS crank.
     
  4. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Eh? You're confusing.



    The B18A/B cranks are the exact same as the B20B/Z cranks. They give the same stroke.



    You will have the exact same stroke no matter what rod you use. The rod length has absolutely NO EFFECT on the stroke length of the engine. It just changes how high the piston rises in the bore at TDC and how low it goes at BDC.



    You could move the pin down in a custom piston, but that would:

    1. Cost a lot
    2. Make rod/stroke ratio worse

    Just buy new rods.
     
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