Search results

  1. G

    Gasoline Additives

    Does anyone have experience with using Valvtect in there boats powered with gasoline. Keep reading about it and with the new formulations in gasdoline would it be wise to consider using it. I have a part of 454 Merc inboards and hold 260 gals when full. Appreciate your inputs
  2. G

    For Bondo

    Bondo, I replyed to your questions raised in your response to my subject: "rebuilt 454 Merc" rebuild concerns 1-25-05. Hoped you might check that response and reply if you have any further information available.
  3. G

    Rebuilt Merc 454 question,

    I ad two 454 Merc V drive bored to 496cu in. We alsostroked the engines. They are in a pleasure 39' 16,000# boat.<br /><br />Engines ran very well but we are using 1t oil every 5-6 hours per engine. Before the rework there was no oil usage to speak of. I have two concerd.<br />1. I believe to...
  4. G

    Dyno testing 454 merc engines

    Does anyone know if there is a location in northwestern Ohio that is capable of dyno teating a long block merc marine engine? Needs to be under load and run for a day or so.<br /><br />Thanks for any input.
  5. G

    Ring seating

    I had Merc 454 rebuilt and bored to 496. Also had ne high torque cam added.<br /><br />Engines now have 25 hours and continue to use oil. The current rate is 1 qt. every 5-6 hours. This means rings must not be seating properly.<br /><br />Is there a way to run the boat to see if the ring can be...
  6. G

    engine RPM question

    I have twin Merc 454 Rochester Quad Carb engines. Rpm for both engines is fine thru 3900 RPM. Once throttles go to wide open the top RPM is 300 short on the port engine. I had engines rebuilt and the aliement and props are good just being reworked. I am looking for any suggestions on what...
  7. G

    WOT

    What is meaning of WOT?
  8. G

    Meaning

    what does WOT mean related to setting timing?
  9. G

    Burned Pistons No. 5&6

    I have a pair of 454 Merc marine 1989 with Rochester quad carbs rated at 750CFM.<br />Engines were rebuilt past winter re bored to 496 and new high torque cam installed.<br /><br />Had 34 hours on the engines and one failed. Two pistons burned thru, nos. 5&6. The reason has to be lean or...
Top