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The Norfolk Broads Forum / Broads Boat Owners Q & A / Nanni 43 hp engine
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Posted By Discussion Topic: Nanni 43 hp engine

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and125
Oct-30-2017 @ 3:44 PM                           Permalink
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Hi has anyone any thoughts of fitting a nanni 43 hp engine to my astral light 3  it has a bmc 50 hp in her now and must be over propped as she only reaches 2300 revs on a good day in drive. however she revs to her proper revs out of gear. as the boat is good at that fuel is fairly heavy, so I was thinking about a nanni 4-190 marine engine I think it will do all I need and use half the fuel. Any help would be appreciated

Mercator
Oct-30-2017 @ 4:43 PM                           Permalink
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‘Afternoon, and125 ...

We own a Westward 38 centre cockpit cruiser which, when purchased, had a 40 hp  Lister Petter engine fitted. In September 2013 we had a new 43 hp Nanni installed, which has now clocked up 575 running hours. It’s a very reliable engine and we’re more than pleased with same.

Most of our cruising is on the northern rivers with the occasional run to the southern Broads, and using tides to the best advantage we are achieving a fuel consumption region 2.1 ltrs/hr.

Incidentally ours is a 17" x 14" three bladed propeller.

Steve.

Steve & Maggie.


Not quite an ancient mariner ..... though some say he was at sea before Pontius was a pilate !

DaveR
Oct-30-2017 @ 6:54 PM                           Permalink
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A Nanni or Beta engine both would be a good choice. They are based on Kubota industrial engines. I have a Beta 43 in a boat at Southwold. Its reliable and does not use a lot of fuel. Beta do a 50hp as well.

annville
Oct-30-2017 @ 7:46 PM                           Permalink
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Hi If your boat is ex hire it could be over propped they did this to stop hirers over revving/speeding,or your engine may have less power now it's older and worn i would try with existing prop first.To fit a different engine will require a lot of work to reroute exhaust cooling and fuel pipes.won't be cheap.If your existing engine starts easily,( bad starting on BMC engines is the first sign of wear problems) Good battery and starter being in good nick of course. stick with it, get a good service good oil etc and save your money. John

and125
Nov-29-2017 @ 5:23 PM                           Permalink
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Hi John, engine is fine and starts fist time every time and will rev to its max out of gear, and I suspected overproped as I have had a look at the other tips that 650x mentioned like screws in the control and screwing the pump back I am not going to do to much . But as I use it in a very tidal environment , I think I will knock the prop down a bit as I am only doing 2200 revs. And I think I could do with that extra bit to turn her round in the river it moored in (hull) I can nearly get round in one by easing back to no speed and then turn and full throtle and she is nearly there but with a bit more pickup quickly and she should go round.in one . I think there are some prop calls about on the net.

and125
Nov-29-2017 @ 5:26 PM                           Permalink
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Cheers Steve and Maggie I was outbid on the engine so I will not bother now I am going to rudbeckia my prop size a bit best regards andy

Graham47
Nov-29-2017 @ 9:30 PM                           Permalink
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Hi and125. Is your boat the third of the Astral Emblem's which were built by Ernest Collins in Wroxham during late 1979 / 80. Later sold to Herbert Woods and renamed Astral Light. I remember being the first person to hire Astral Emblem 1. We had to wait for the boatyard to put the finishing touches to the boat before we could board it. We went down river from Wroxham and almost had to do a three point turn to get into Wroxham broad. We went back to the boat yard and told them but they said they were aware of it and would look at it on its return. I hired from Ernest Collins for several years and their boats were generally governed to Cruise at a max of around 2000RPM with 1800 RPM as a guide for 6MPH.



This message was edited by Graham47 on Nov-29-17 @ 11:45 PM

annville
Nov-30-2017 @ 3:26 PM                           Permalink
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Hi Graham All the symptoms of over being over propped. John


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