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PIPE for 3 HOLER

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  • PIPE for 3 HOLER

    Has anyone tried or had success with a pipe on a 3 Hole OMC ? My late father started on a project a few years ago , but we never finished the manifold end.. I'd be entertained to continue with it if anyone thinks its worth a try. I vaguely remember reading that John Runne tried something on a FEH back in the day ?
    Last edited by Hunter 93-N; 01-08-2018, 11:58 AM.

  • #2

    Re: PIPE for 3 HOLER

    Hunter, the 3-cylinder 2-cycle engine presents a unique opportunity for exhaust tuning quite compactly because the exhaust pulse from one cylinder helps scavenge the exhaust (and also the intake) from another cylinder. I don't understand this well, but I know it works because of the 120 rotational timing of the firing impulses among the cylinders. The 3-cylinder Crescent outboards from Sweden use tuned megs in their driveshaft housings, and 3-cylinder Saab two-cycle car engines of the 1960s did as well. I think your dad was wasting his time with that exhaust chamber. You'd need such a tuned chamber for each cylinder to work, and that would be far too unwieldy on your boat.

    ​Better you do some internet research on your exhaust situation: find out what Johnrude did on Stingers, for example. I'm sure that someone on this forum can better advise you. -- dave

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    • #3

      Re: PIPE for 3 HOLER

      When Crescents were the fast C engine, people tried megapones and chambers on them. The factory setup was better. I like the story that the Crescent was designed with a pencil and a papkin while drinking beer.

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      • dwhitford
        dwhitford commented
        Editing a comment
        What's a ''papkin'', John?

      • rumleyfips
        rumleyfips commented
        Editing a comment
        It's either a paper napkin or a typo Dave.

      • dwhitford
        dwhitford commented
        Editing a comment
        Typo, John. That's what I thought. You're excused this time, but maybe you should proof- read what you send out what the world will see later . :<))

    • #4

      Re: PIPE for 3 HOLER

      Hunter, Lopez on the west coast that had a crap load of records in FE ( had a post last year trying to sell everything )had sold a 3 holer with tunes pipes to Kevin Fitzgerald. I do know there is a couple of sets of those pipes kicking around. Maybe shoot Kevin an email...he may know who has some.
      Last edited by DiGia54D; 01-09-2018, 08:58 AM.
      sigpicWayne DiGiacomo

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      • #5

        Re: PIPE for 3 HOLER

        Hunter: Have tried chambers on 850 MOD 3 cylinder engines many times. Have tried both 3 into 1 and 3 individual pipes. Both designs work though the 3 into 1 works best should you desire to pull the pipe. Looper engines really perform best with expansion chambers.
        john sharp 8H

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        • #6

          Re: PIPE for 3 HOLER

          Wayne you are correct that's Mike Lopez. Now in Texas. Hunter get a hold of Steve Benson in Wash area. He built the snail pipe exhaust that Lopez had. It was Steve that did that years,ago prior to selling to Mike.

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          • #7

            Re: PIPE for 3 HOLER

            Gun I have 3 sets of Benson pipes for the OMC, if interested let me know

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            • #8

              Re: PIPE for 3 HOLER

              i cleaned Lopez out. I have 2 sets of chambers and plan to run them this year. have not yet tested....stay tuned

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              • #9

                Re: PIPE for 3 HOLER

                Hey Gun. If that is the pipe Jaws made, it is for a two cylinder.

                Comment


                • Hunter 93-N
                  Hunter 93-N commented
                  Editing a comment
                  yes, thats the one.. Thanks. !
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