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Thread: Rich, Lean, WTF

  1. #1
    AKA: Larry lafjax's Avatar
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    Rich, Lean, WTF

    I just pulled my J-Pipe to install the shorty water box when it comes and I found this on the exhaust manifold, carbon buildup on the pipe and a grey/shiney substance on the flange. This is after about 10 hours of running with my gutted and shortened stock water box with jpipe cut 1" and flared for 1". My waterbox appeared to have been a little hot where the jpipe enters because the black rubber cover looks like it melted under the rubber clamp for about 2". Just wonder if this is something to worry about or just regular maintenance? Jpipe did not look damaged at all.
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  2. #2
    DaveC's Avatar
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    From what I understand that is not that uncommon, more so when you up the boost. Here is the link to the best repair for that type of problem.

    http://greenhulk.net/forums/showthread.php?t=25478

  3. #3
    EZ Dock of Long Island Shibby1485's Avatar
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    the grey shiny substance is aluminum... tahts' the bell of your exhaust manifold that couldn't take the heat. ur either lean or on the rev limiter

  4. #4
    AKA: Larry lafjax's Avatar
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    Quote Originally Posted by Shibby1485 View Post
    the grey shiny substance is aluminum... tahts' the bell of your exhaust manifold that couldn't take the heat. ur either lean or on the rev limiter
    I'm running 8240-60 with 82mm ring at WOT...guess I need to come down another 100 rpm's.

  5. #5
    Vern's Avatar
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    What Shibby said ... and contact Steve Friebe and exchange your manifold for one of his modified ones that he installs a SS bell on, or else you run the risk of overheating the flex joint in your J pipe and having that leak eventually ...

    Interesting picture ... the 'bell' from the end of your manifold melted off and it seems like there was a little exhaust reversion that then deposited the superhot aluminum backwards onto the flange.

  6. #6
    EZ Dock of Long Island Shibby1485's Avatar
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    Vern... i just smoked my manifold running the rev limiter for about 20 minutes... same thing on my ski... it went backwards and embeeded itself in the same spot
    Last edited by Shibby1485; 11-13-2007 at 09:38 PM.

  7. #7
    EZ Dock of Long Island Shibby1485's Avatar
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    Quote Originally Posted by lafjax View Post
    I'm running 8240-60 with 82mm ring at WOT...guess I need to come down another 100 rpm's.
    on a stock ECU!! yes, take the rpms down asap, how long have you been running that ski against the limiter at those rpms

    if all the mods in your signature are still up to date, and 70.7 is your top speed... well that's why your speed is so slow for all those mods you have listed... you have few more mph in there once you get the rpms down... you should definitely be moving along faster with all those mods you have larry
    Last edited by Shibby1485; 11-13-2007 at 03:11 PM.

  8. #8
    My new toys at work bruinsrme's Avatar
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    Sheeet I will have to look at mine when I get home.
    Not to hi jack the thread but if Larry is running the stage 2 prop with his current mods and pulling 8240 is it the prop of nozzle ring

  9. #9
    AKA: Larry lafjax's Avatar
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    Quote Originally Posted by Shibby1485 View Post
    on a stock ECU!! yes, take the rpms down asap, how long have you been running that ski against the limiter at those rpms

    if all the mods in your signature are still up to date, and 70.7 is your top speed... well that's why your speed is so slow for all those mods you have listed... you have few more mph in there once you get the rpms down... you should definitely be moving along faster with all those mods you have larry
    Steve, what prop do you think I could run...and I have hit 72.5 but not consistantly. I've tried a 15/20 - 2mm but only run at 68mph at 8040. I just can't see to find the right combination. Todd has a 12.5/20 I'm going to try with the rings..maybe that will tell something.

  10. #10
    TERRY bigbuck12345's Avatar
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    bigbucks ski also

    Larry mine looks the same i was going to order the ss one this week
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