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  1. #1

    Ultra LX and 250X compression ratio difference.

    Hi, can anyone tell me how the difference in compression ratio is achieved between the LX and a 250X? Is it just a different head gasket to lower the compression for the supercharged engine? Thanks.


  2. #2
    fx160's Avatar
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    Different pistons

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    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Quote Originally Posted by fx160 View Post
    Different pistons
    Not just different pistons, the cylinders are much taller on the 250x. The wrist pin location in the 250x is shifted to give a higher deck height and taller piston crown.

    Sean

  4. #4
    LX is a 15f motor. 250x is a, wait for it, 250x motor.

  5. #5
    Take the time to smile sirbreaksalot's Avatar
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    Quote Originally Posted by raven007 View Post
    LX is a 15f motor. 250x is a, wait for it, 250x motor.
    OK mister smarty pants,
    if I put 310 pistons in my 300 do I get a 610 with faulty pistons now ??????????

  6. #6
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Quote Originally Posted by sirbreaksalot View Post
    OK mister smarty pants,
    if I put 310 pistons in my 300 do I get a 610 with faulty pistons now ??????????
    No but if you put 12f pistons in a 15f you get a 27f

    Sean

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