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  1. #1

    12f and 15f cran cases

    Hey guys I'm wondering if the 12f engine (from a STX12F) and the 15f (ultra lx) run the same crank cases, I heard they are the same but want to know if anyone knows defiantly?

  2. #2
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    The lx case is different from the 15f and 12f but you might be able to make it work. The lx shares the cases with the boosted motors.

    Sean

  3. #3
    Quote Originally Posted by smokeysevin View Post
    The lx case is different from the 15f and 12f but you might be able to make it work. The lx shares the cases with the boosted motors.

    Sean
    What is the difference in them can you tell me?

  4. #4
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Quote Originally Posted by SEDUCE View Post
    What is the difference in them can you tell me?
    I have never had them on the bench together so I don't know for sure.

    Sean

  5. #5
    dcuhpw's Avatar
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    Quote Originally Posted by smokeysevin View Post
    I have never had them on the bench together so I don't know for sure.

    Sean
    I would assume the bosses for the supercharger bolts are there on the LX block if it shares the same crankcase


  6. #6
    Quote Originally Posted by dcuhpw View Post
    I would assume the bosses for the supercharger bolts are there on the LX block if it shares the same crankcase
    My ultra LX is not supercharged its naturally aspirated. 1.5L

  7. #7
    steve45's Avatar
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    Well, I've got an STX-15F for parts (engine conversion for an Ultra 150) and an Ultra LX for parts (engine conversion for my Yamaha jet boat). Unfortunately, I haven't had time to actually start working on either project, so I can't help you right now.

    I hope to pull the engines over the winter, so I'll be able to tell you more then.

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