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OEM Piston for Higher Compression?

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    #1

    OEM Piston for Higher Compression?

    I was reading on Honda-Tech, how the h22 & f23 can use interchangeble piston/rod combo's to achieve different compression ratios.

    I was wondering is there any other piston that is a direct fit into the f22aX that will yield a higher compression? And if no, then where could I find a decent priced piston to get a compression of ATLEAST 11.5:1?
    Tags: None
    #2
    Originally posted by TheChosenOne View Post
    I was reading on Honda-Tech, how the h22 & f23 can use interchangeble piston/rod combo's to achieve different compression ratios.

    I was wondering is there any other piston that is a direct fit into the f22aX that will yield a higher compression? And if no, then where could I find a decent priced piston to get a compression of ATLEAST 11.5:1?
    There isn't a drop in 85mm piston that will raise the compression that much. You'll have to go aftermarket or use a K20 piston (which is at this point has not been proven reliable....yet) Either way you'll have to bore it to 86mm.

    I'm using OEM K20Z1 pistons in my build. The piston wrist pin holes have to be bored like 0.08 or some other small amount (to use non floating type F22 wrist pin). Also, the wrist pin is offset on the K20 pistons to reduce sideload on the cylinder walls, BUT since K's spin in the opposite direction from F motors it is best to flip the piston around (exh on intake side and vise versa). This creates a potential problem because the exhaust valve reliefs on the K-piston are too small for the F22 intake valves. Add the cost of the piston (I paid $100 for mine) and the machine work (??150). So around $250. At this point you're only $150 away from nice forged pieces.

    The K20 piston may prove to be a reliable alternative, but it hasn't been proven yet, so i'd go aftermarket.
    H.S.A.E.

    90 CRX Si - gutted, caged, Bisi F2d kit, close ratio LSD trans, F22A6 - under construction

    99 civic LX - y8 head and trans, lowered, blowing cold AC, and getting 35mpg.

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      #3
      Thanks, Man.

      I
      I really didn't want to have to get it bored and honed, but I guess I have to.

      I don't' have enough know-how, or equipment to be able to do the modifications myself, and i'm not gunna pay an arm & a leg for labor on some used cast piston.


      Prolly gunna get the Bisi Forged pistons.

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        #4
        Find some F20B pistons. They're the correct bore. Don't know about compression height, wrist pin diameter, or what compression it'd make, but it's an option.

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