need motor advice
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need motor advice

  1. #1
    Junior Member dboy1k's Avatar
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    Default need motor advice

    well im new to the jet scene and im having some motor issues.
    i cant seem to get my bbc to stop popping through the carb at mid top to wide open. iv had it for about 3 months now and for the first 2 months it never did it.ive ask s few locals and they told me that the issue was to lean so i richened it up some, still no dice. had a guy check the valves,no dice.any help would be great

    thanks danny

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by dboy1k View Post
    well im new to the jet scene and im having some motor issues.
    i cant seem to get my bbc to stop popping through the carb at mid top to wide open. iv had it for about 3 months now and for the first 2 months it never did it.ive ask s few locals and they told me that the issue was to lean so i richened it up some, still no dice. had a guy check the valves,no dice.any help would be great

    thanks danny
    Start with fuel delivery, I believe you are experiencing a lean condition.

    I would start with a known good fuel pressure gauge and a vacuum guage on the manifold....This limited info will tell a long story....


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    Senior Member Delemorte's Avatar
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    Sorry to hear about your issue danny. Not sure i can give any meaningfull advice on the cause however i do have a word of warning...

    if you suspect a lean condition.... dont run your boat until you have it sorted out....I learned that the hard way... Pictures do all the talking.


    http://www.performanceboats.com//showthread.php?t=43887
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    Co-Founder of SHB MarKist's Avatar
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    timing maybe ???

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    blown mopar moparjet's Avatar
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    wiped cam lobe.. maybe
    throw it in reverse

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by moparjet View Post
    wiped cam lobe.. maybe
    Been there done that and yes the carb popped at mid rpm's.
    Could also be a vacuum leak thus causing the lean cough.
    Seriously, I would pull the valve covers, fire the engine and see (if) all the rockers are lifting the same amount. If you got one not moving much...wiped cam lobe and/or dead lifter, maybe bent pushrod.
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    Cas
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    Angry American Cas's Avatar
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    Good ideas so far but I'd also check inside the distributor to make sure the springs on the centrifugal advance are attached properly. While you're in there, make sure the cap doesn't have a hairline crack in it somewhere.
    Actually, I'd start with the basics and the easy stuff, plugs first. then test each of the plug wires to make sure there isn't an issue with them, cap and rotor.

    Are you running a points distributor or an electronic?

  10. #8
    Amber Racing Services BUSBY's Avatar
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    99% chance that you have a flattened lobe on your cam.

  11. #9
    Sit N' Spin Jetaholic's Avatar
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    Either flattened lobe or too much advance. A good safe starting point for a stock/mild compression naturally aspirated motor is to have about 34 degrees total all in by 3000 RPM.



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    Junior Member dboy1k's Avatar
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    Quote Originally Posted by BUSBY View Post
    99% chance that you have a flattened lobe on your cam.
    why would it do it at high rpms only? just asking because i dont know anything about this
    also if thats the issue how do i check it?and what would a cam cost?im not trying to get alot out of the motor i just want a good running boat.

    also thanks eveyone that has replide this site is awsome

    danny

  13. #11
    "Try it Now!" Tahiti Boss21's Avatar
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    Timing?
    1992 Eliminator Daytona 21'

  14. #12
    Junior Member dboy1k's Avatar
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    well i dropped it off at the local speed center and they are going to check the cam deal so by this afternoon perhaps we will have an answer

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    Screamin SeaMonkees Schi-502's Avatar
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    Good Luck. Post lots of pictures.
    Loose, the Dogs of War!

  16. #14
    Some guy obnoxious001's Avatar
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    Quote Originally Posted by dboy1k View Post
    well im new to the jet scene and im having some motor issues.
    i cant seem to get my bbc to stop popping through the carb at mid top to wide open. iv had it for about 3 months now and for the first 2 months it never did it.ive ask s few locals and they told me that the issue was to lean so i richened it up some, still no dice. had a guy check the valves,no dice.any help would be great

    thanks danny
    While you were in the carb, did you check and/or adjust the float level? If the float level is low, you can run the bowl out of fuel at higher speeds.

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