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  1. #1

    Default engine won't rev past 3000 rpms under load

    I have twin 305 chevys 228 hp inboards . Having problem with both engines not wanting to rev past 3000 rpms. Will not get up to plane. Carbs rebuilt correctly new plugs, wires ect . Have not replaced cap but looks good. Engine starts right up. Checked antisiphon valve got crud out of that. Any ideas ?

  2. #2
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    11,869

    Default Re: engine won't rev past 3000 rpms under load

    What, if any, changes have been made to the boat or to the engines just prior to this?


    Hull bottom clean?
    Engines in full tune?
    Progressive and Total Advance correct as per the OEM curve?
    Fuel good?

    If the ignition system is not delivering the correct Progressive and Total ignition advance, no gasoline engine will produce it's potential output.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  3. #3

    Default Re: engine won't rev past 3000 rpms under load

    Hull bottom clean Engines in full tune fuel is good . Havn't checked advance yet but engines are set a right timing. It happens in both engines .

  4. #4
    Join Date
    Apr 2013
    Location
    Lower Columbia River
    Posts
    157

    Default Re: engine won't rev past 3000 rpms under load

    The fact that you found crud in your anti-siphon valve is a major clue. Did you check it again after running the engines up? Also, it could be that you have a screen on the bottom of the fuel pick-up tube, and it's getting clogged. If it was my boat, I would be suspect of the entire fuel system.

  5. #5

    Default Re: engine won't rev past 3000 rpms under load

    just an update . Found two dead cylinders on engine after a compression test.

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