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Mako 236 Reno

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  • #1

    Mako 236 Reno

    Hey guys,

    I have tried to sell my 236 with no luck. But in the mean time I have fished it a lot and she has really grown on me. I want to put together a boat I can run 50/60 miles south out of Long Island and fish for Bluefin.

    Only issue is the power. I have a 165hp diesel in her now and she only cruises at 17mph or so. Thus a trip that far would take 3 hours or more.

    I have come to learn that when you buy a boat you are basically buying an engine. So I have been researching a significant upgrade.

    The current engine in a 6 cylinder volvo AQAD40B and is massive. It is in fact the same foot print as similar engines in the 3/400hp range. I am looking into Cummins QSB 5.9 380hp and the 6bta at a similar power.

    My goal is to be able to efficiently cruise at 30mph or better with-ought burning much fuel. I know the engine might be overkill, but was thinking the more power then less I have to throttle and the more I save in fuel.

    Just wanted to see if anyone had any thoughts?

    Best,

    joe
    Tags: None
  • #2
    There was a guy in Houston that had a 236 that he just completed a redo including a 6bt. He had it up for sale on craigslist a few months ago. He claimed it topped out at 27 knots. The 236 hull is just not ment for speed. But it is a great looking boat. With the engine down low and center I think its one of the most stable mako's.

    If you want speed for 60 mile runs get a mako 25 with a new 4 stroke 300-350HP single. Some guys are getting 40+ knots with that combination and unbelievable fuel efficiency at 20-30 knot cruise. Or you can double up for twin 175's if you like the idea of twins.

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    • #3
      hows the suggested motor compare in weight? im just curios because it was my first thought
      1984 Mako 238 WA [br]2015 Suzuki 250 APX[br]Central PA/OCMD[br]http://www.classicmako.com/forum/topic.asp?TOPIC_ID=35081[br]

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      • #4
        Looks like it's a100 pound difference.

        I know having a shaft sticking through a hull is very different from outboards, but I assumed the 23's were in fact the same hull.

        I wish we knew the horsepower of the boat repowered with the 6bt. I believe those engines ranged from 200hp up to 450 or so.

        I am basing a lot of my info on a boat in Mass, a 24' Blackfin. Guy put a 400hp diesel in it which was previously powered with a small hp diesel. He now cruises at 30 and only burns 4gph. I know the boats are a different hull design etc, but would think that doubling the HP would have huge results without adding a ton of weight.

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        • #5
          It may not do you any good to have that much power if you can't fit a big enough wheel underneath it. What kind of clearance do you have for the prop?

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          • #6
            I have some room. I am spinning an 18x18 4 blade now. Could move to a 19 or 20 without an issue. I only get close on blades with a big rake, and get close to the edge of the rudder.

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            • #7
              Consult a good prop guy for advice. Don't assume that the distance from the shaft to the hull is equal to 1/2 the wheel size. Clearance is needed between the edge of the wheel and your hull.

              I wish I knew what that would be, but I don't.
              Ole Joe
              Just floundering around
              White Hall & Ocean City, Maryland
              1978 Mako 25

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              • #8
                quote:

                Originally posted by 2mehouse


                Looks like it's a100 pound difference.

                I know having a shaft sticking through a hull is very different from outboards, but I assumed the 23's were in fact the same hull.

                I wish we knew the horsepower of the boat repowered with the 6bt. I believe those engines ranged from 200hp up to 450 or so.

                I am basing a lot of my info on a boat in Mass, a 24' Blackfin. Guy put a 400hp diesel in it which was previously powered with a small hp diesel. He now cruises at 30 and only burns 4gph. I know the boats are a different hull design etc, but would think that doubling the HP would have huge results without adding a ton of weight.

                That Blackfin also weighs about 1500lbs more.
                1975 Mako 26 Inboard[br]1976 Mako 23 Inboard[br]1984 Rhodes 19[br]Padanaram, MA

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                • #9
                  I put a 200hp 4cyl mercruiser diesel in my 23. It is an io so there is a difference there. I also have a bravo 3 drive which is huge spinning 2 big wheels. We cruise at 2900 rpm 27mph burning 4-5 gph depending on load. With the 70 gallon tank we can go where ever we want. Wide open 3800 rpm we get 35-36 mph burning 12-13 gph. The diesel weighs 790 # without the drive
                  Billy[br]1974 Mako23 CC Cuddy IO[br]200hp Cummins Mercruiser Diesel w/ Bravo 3X Drive[br]Bellport Long Island NY[br]http://www.classicmako.com/forum/topic.asp?whichpage=1&TOPIC_ID=42355#319618[br][/URL][br]

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                  • #10
                    I'll start a controversy, why not? Making the switch to gas would save you a lot of money. Those new 6.2l mercruisers look pretty nice.
                    [img=left]https://i.imgur.com/b1nW04t.jpg?2[/img=left][br]1975 23 Inboard [br]Chesapeake, VA[br]http://www.classicmako.com/forum/top...TOPIC_ID=59930

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