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Thread: Flying Tomato is Back!

  1. #1
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    Flying Tomato is Back!

    The new motor is in and running. Feels really good. Sounds good. However, upon inspection of the plugs, it looks to be running lean. (white plugs)

    Any recommendations on jets for the BG850 annular carb. Motor is a short 540 that should be making around 625 hp.

  2. #2
    mrfixxall Guest

    Fixx

    i would go 88 primary and 94 on the secondarys for starters..run it fat and take out or add if needed...to be honest,this time around have it dynoed to make sure the Air fuel is correct..the money spent will be worth it in the long run..

    If it were me it would have a dominator on it..

  3. #3
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    And I'd put closed cooling on it.
    If you're interested, I can give you some sources.
    If you're not,......
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  4. #4
    mrfixxall Guest

    Fixx

    looking at the engine,,,get rid of that pos fuel filter and non uscg fuel hose.you will need to upgrade the fuel system to fuel that monster..go to a 1/2 '' fuel line from the tank back or you may end up @ square one again..

  5. #5
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    if you have a secondary PV, i'd go 88's all around..

    +1 on the 1/2" line comment
    Charter Member - WAFNC, SBBR, KWOSG
    1955 Perfect Mate
    1986 Hornet III, 502-415 TRS

    www.donzi.org


  6. #6
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    Quote Originally Posted by mrfixxall View Post
    looking at the engine,,,get rid of that pos fuel filter and non uscg fuel hose.you will need to upgrade the fuel system to fuel that monster..go to a 1/2 '' fuel line from the tank back or you may end up @ square one again..

    +2. Many a good engine has been screwed up from fuel delivery.
    2001 35 Fountain Lightning w500 EFI's
    1973 X-18 - Merc 383 Magnum
    1974 Chris Craft Roamer with 1271 TI's

  7. #7
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    OK, dude...whatever they said, just make sure you shake it down BEFORE we go out.....I'm tired of being blamed on FT's breakage issues
    Capt. D.J. "Jefe" Reid -- RIP Big Grizz..and MOM
    '98 30ZF - Jefe's Revenge, '07 250 E-Tecs
    Founder/Co-Captain (South Region) - Donzi RED Bikini Crew
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  8. #8
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    no nos

    I took the NOS off the boat. I havent really tweeked the set up yet, but it feels like it is going to run just as fast as the old motor with the juice!!

    Jeff,
    I was not ever blaming you. Just a fluke.

  9. #9
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    Carb question

    After installing 94 jets in the secondaries of my bg 850:

    Big lag at the point where the secs kick in, and eng sounds lean (loud). Didn't want to turn over 5k

    Test 2:went to97s in sec. Still big lag, still sounded lean and Rpms up to5200.

    It feels like it is not getting enough fuel. Carb has no pv in secs. Is it possible to in stall a pv. Or do you have to change out more parts for a pv?????

    Confused

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    More info

    Fuel supply has been upgraded to 1/2 inch everything

  11. #11
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    97's is huge...

    never seen anybody run an 850 like that

    what boosters do you have?
    Charter Member - WAFNC, SBBR, KWOSG
    1955 Perfect Mate
    1986 Hornet III, 502-415 TRS

    www.donzi.org


  12. #12
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    +1!! You need to prop it down to 5k and play with the jets, it may not be able to swallow that much fuel.
    No matter what your beliefs are "GOD BLESS AMERICA"

    Fully retired marine tech near 60 years in the biz.

  13. #13
    mrfixxall Guest

    Fixx

    Are you reading your fuel pressure while @ 5200 rpm's? The lag when sticking it in the secondaries,, what size squirter are you running? does the carb have annular boosters? and what cc in the secondary accelerator pump? i like to use jet extensions in the secondaries and notched floats.

    you can add a power valve but you will have to drop 6-10 jet sizes,also the ports in the metering block will only flow so much fuel through the 2 little holes behind power valve and may need to be drilled out to allow more fuel to go through the card into the engine..

    Back the timing down to 34*,that will give you more rpm in the big end..Get your timing set rite then start jetting..

  14. #14
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    More info

    Carb has Annular boosters
    Timing always at 34
    Carb is vac sec which has no accelerator pump
    There is no threaded hole where pv goes

    Note: this carb has been ran on the 489 for 2 seasons and performed well with NO jets in secs

    Ft

  15. #15
    mrfixxall Guest

    Fixx

    Quote Originally Posted by flying tomato View Post
    Carb has Annular boosters
    Timing always at 34
    Carb is vac sec which has no accelerator pump
    There is no threaded hole where pv goes

    Note: this carb has been ran on the 489 for 2 seasons and performed well with NO jets in secs

    Ft
    Get rid of the carb and get a mechanical secondary carb..i can go on and on about adjustments but i will never use a vacuum secondary carburetor..

    call thease guys http://www.candsspecialties.com/stor...lbillets2.html

    inquire about the 0541000 ,give them your specs,bolt it on and go boating..with this carburetor its like having a FI motor,,throttle response is unbelievable..

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