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naturally aspirating hino 220(39)s-gctid405023

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    naturally aspirating hino 220(39)s-gctid405023

    So just for the fun of discussion...has anyone converted their 45 or their 47 to naturally aspirated engines, either via repower or removal of the turbos (say if they get the spider cracks the hino turbos are prone to have)? Most people tend to run their 45/47's at hull speed seemingly 95% of the time- we certainly cruise that way. Yes, it can be nice to kick it up to 18 knots but how often do you really need to do that? Some low hp, naturally aspirated diesels in the 45 or 47 would be a great long range cruising option and just curious if anyone has ever done this.
    ~~1987 Bayliner 4550 Pilothouse & 17' Boston Whaler Dauntless~~

    #2
    When we ran our 4588 at 6.5-7 knots the turbos were barely turning. So ineffect, these engines already are "nearly" naturally aspirated at the speeds at which you are talking about anyways. I would think that they were at least paying for themselves at these lower speeds, and perhaps they don't even need to be removed. When we hit 8.5 knots I recall that was when you could hear the turbos getting to work. I would think that the injectors would have to be reworked if you didn't have the turbo as you would be delivering too much fuel.

    Cheers steve

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      #3
      We have turbo boost gages and boost presure begins to build at about 1,600 rpm's.

      There are a host of things you would need to get and/or change to conver the 220 back to a 175 Hino.

      No problem in doing it just perhaps consider the entire list before you begin the process.

      'Most people tend to run their 45/47's at hull speed seemingly 95% of the time- we certainly cruise that way'

      FWIW - That is not the way it appears in this area based upon the Bayliners we run across.

      Hope this helps
      Northport NY

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        #4
        See long string from earlier this year on this topic on this forum.

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          #5
          our 3888 has twin 210 hinos.. we run around 1900-2100 and the turbo isnt kicked in... once a trip we get her up on step and clean the gunk out from running a moderate speed.. we are boating.. no hurry to get anywhere anytime soon... since cleaning the crap from 2yrs off the hull, props and trim tabs.. she is a fuel saver now.. we havent seen cracks anywhere.......

          :worth lifes to short... go boating

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            #6
            "we havent seen cracks anywhere......."

            It is very unlikely you will see cracks in a later turbo - they were mostly found in very early air cooled turbos and the very first water cooled ones (1985-1988 era).

            Hope this helps
            Northport NY

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