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Re: [bolger] Re: MICRO TRAWLER

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  • nezih
    Sir, Thanks for your below comments.For engine,I am agree with you.I am from one of the Mediterrenaen countries,standards are not so high.So Indoor engine
    Message 1 of 42 , Nov 11 4:11 AM
    Thanks for your below comments.For engine,I am agree with you.I am from one of the Mediterrenaen countries,standards are not
    so high.So Indoor engine installation will not be a big problem for standards.Offcourse it is necessary fo security.I think to install
    one Diesel,air cooled engine.Offcourse ventilation and air intake standards will be applied.Generally,what we are doing in hot summer time.
    When the engine heat is up,we take off the Engine cover for more air ventilation and more air intake.Besides,half of the engine will be over
    the rear deck.So it will be easy to do an operation like this.In order to eliminate fuel vapors,I can install the fuel tank at the open cockpit,at the
    rear side.I really thank you very much for your kind comments.I will take into consideration during the building of MT.
    Pls find attached another two pictures,builded without the sleeping quarters area.It seems beatiful.
    ----- Original Message -----
    Sent: Sunday, November 11, 2012 3:42 AM
    Subject: [bolger] Re: MICRO TRAWLER


    The Microtrawler Grebe was a nice build project documented at Duckworks Magazine. She started life as a standard MT but the owner cut back the sleeping quarters area to open up that space on deck for the grand kids to roam about. The third photo looks like a variation of the Berkeley Eastman Can-Du EZ mini-tug, albeit with a western style slanted fwd windshield. I really see an inboard engine creating more design issues that an outboard mounted engine eliminates, but in the end, it is your own interpretation of the design that counts. As long as all installed engine systems are per standards established by the ABYC and are safe, go for it! As you are probably aware, US Coast Guard and ABYC standards for inboard mounted engines will call for proper engine compartment ventilation, spark arrested air intakes and proper fuel line routing and mounting standards to be followed. Enclosing a gasoline powered engine in an enclosed space creates certain hazards that must be taken into consideration! Fuel vapors collecting in that space and an errant spark can result in tragic circumstances and should not be taken lightly. I like that slanted forward windshield. That style came from the US west coast fishing vessels, where the slanted windshield was found to better shed water. Should be an interesting build, Nezih!

    True Doug, Ford FE gas truck engines had larger diameter crankshafts and cam profiles designed more for low RPM torque, compared to the equivalent car engines.
    Message 42 of 42 , Nov 16 6:36 PM
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      True Doug, Ford FE gas truck engines had larger diameter crankshafts and cam profiles designed more for low RPM torque, compared to the equivalent car engines. Some GMC truck gassers even had exhaust valve rotators and stellite valve seats, anticipating heavier engine load demands. 

      Your Isuzu may have had oil starvation issues if the oilpan capacity was not increased and the pickup lowered. I have a marinized 1956 Packard V8 with the oilpan capacity increased from 5 quarts to 4 gallons and an integral oil cooler built in. Most working boats of 25-30 feet and up have gone diesel but that may not be a practical option for the MT being discussed. 4 cycle outboards have been around for several years now and have a good track record even in small commercial fishboats that get hard use.

      From: Douglas Pollard <dougpol1@...>
      To: bolger@yahoogroups.com
      Sent: Fri, November 16, 2012 12:33:28 PM
      Subject: Re: [bolger] Re: MICRO TRAWLER


      Yes this is all true. Back in the 1960's we used to marinize v8 gasoline engines for Chesapeake Bay work boats. WE always looked for a truck engine because they had four bolt main bearings and I think maybe an extra main though I am not sure about that. Most Of the small diesel boat engine are industrial stationary engine that the manufacturer has marinized. There is not much difference between an engine running a boat and one running a water pump 24-7.   I think that the Volkswagen 4 cylinder automobile diesel engine did not hold up well.  I had a 3cylinder Izuzu diesel in a boat and it was a marinized industrial engine.  I had trouble with the #1 cylinder and again after rebuilding. I figured it was designed to set flat when running and the incline may have been a problem??   My experience with outboard engines is that they don't last long in my experience. This may be due to running wide open all the time??   I can't speak for the 4 cycle high torque engines with propellers intended for slower none plaining boats. They may be great?           Doug

      On 11/16/2012 12:29 PM, JOHN WALLIS wrote:
      Good points Susanne. Also consider that automobile engines typically only run @ about 20% of rated max HP around 80% of the time (coasting, idling at the stop light, flat terrain cruising etc). 

      On the other hand, when you consider hull drag, prop thrust and friction, marine engines are constantly going uphill towing a trailer and are designed accordingly. My recommendation is a 4 stroke outboard until you get into larger boats where a diesel inboard makes more sense. 

      From: "philbolger@..." <philbolger@...>
      To: bolger@yahoogroups.com
      Sent: Fri, November 16, 2012 4:57:13 AM
      Subject: Re: [bolger] Re: MICRO TRAWLER


      Every SUBARU engine is a flat -4 or -6 - and always water-cooled.

      Ultimately for the horsepower to get MT up on a plane no power plant will as light for the power as an outboard by the time you add up gearbox, shafting, propeller, pivoting of prop etc.

      Susanne Altenburger, PB&F
      ----- Original Message -----
      From: nezih
      Sent: Friday, November 16, 2012 3:35 AM
      Subject: Re: [bolger] Re: MICRO TRAWLER


      Any picture of the Engine,you saw in Fort Lauderdale in a Dunebuggy shop.
      Highly appreciated
      ----- Original Message -----
      Sent: Friday, November 16, 2012 4:24 AM
      Subject: Re: [bolger] Re: MICRO TRAWLER


      I read someplace that the engine designer was an airplane designer. It sure looks like and airplane engine. Back in the 1980's somebody built a water cooled aluminum block to bolt on to the crank case in place of the air cooled jugs.  They also had water cooled heads for it. I saw one of the engines in a Dunebuggy shop In Fort Lauderdale. That engine might well make a nice boat engine.  

      On 11/15/2012 09:00 PM, Mark Albanese wrote:

      Yeh, it was great to have it and the transaxle balanced atop a rolling jack. The heat is what burned the valves out. I expect in a boat one may also seem pretty loud.

      On Nov 15, 2012, at 11:49 AM, Douglas Pollard wrote:

      What the engine had going for it was it could be dropped out for rebuilding in 15 minutes.  Usually the valves were burned and new rings needed the lower end bearings and crank held up well... ...I would think it would make a far better engine for an air boat. In this case it can be standing above the boat where it can get free air circulation.  

      On 11/15/2012 12:52 PM, nezih wrote:

      Yesterday,I have been informed that boat builders here are installing old VW Beetle Engines(after marinise)
      as Inboard Engine.They are not heavy,like outbards.I think this engine eliminates the weight problem of other
      Inboard Engines
      Awaiting comments.

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