Sailboat Repower Question

[rostyvyg]

Originally Posted by FPNC

59 hp is marginal for the displacement of the vessel, but it will work with the right propeller. You have a Max Prop. Call PYI in Lynnwood, WA (800-523-7558) and ask them which gear reduction will work best with that prop and what the recommended pitch setting would be.

I spoke to them already and they think that with a 2:1 gear ratio, I would not even need to change the pitch :-). Still not sure if 59HP would be enough, though.

[FPNC]

Originally Posted by rostyvyg

I spoke to them already and they think that with a 2:1 gear ratio, I would not even need to change the pitch :-). Still not sure if 59HP would be enough, though.

4 hp per long ton should normally get you hull speed. Provided the propeller is properly sized. Which yours is. 4.5 hp per long ton is normally more than adequate power for any conditions. I.P. boats are beamy, heavy and have a lot of wetted surface. This is why I would say that 59 hp is nominal. But I have also seen quite a few CSY 44's push quite nicely with that much power.

[Goodxcharly]

FWIW- I would go with Universal or Bets as all 3 use Kubota engines and I don’t see any advantage with a French marinixed engine.

[cottonsail]

3 HP per 1000 lbs. Anything less you won't be happy. Just my experience.

[rostyvyg]

Nanni looks much more streamlined than Beta. It is narrower, access to all aggregates and systems is easier and the base Kubota engine does not have injectors hidden under the valve cover as opposed to the base Kubota engine used by Beta which has injectors under the valve cover.

[rostyvyg]

Originally Posted by cottonsail

3 HP per 1000 lbs. Anything less you won't be happy. Just my experience.

With this formula, my current engine should have been 90 HP. Meanwhile, I said earlier I feel that with the current 75 HP, the boat is quite overpowered as is.

[rostyvyg]

Just for general information, Nanni N4.65 is based on a Kubota V2403-M-T-E3B tractor engine, turbocharged, no intercooler, mechanical indirect injection.

[malbert73]

I’m with the folks that say the Nanni will be fine, and my opinion is based on the fact that you really don’t use nearly all the HP in your current engine. And, you’ll be happy with a lower revving engine
FWIW- my Beta 50 (Kubota V2203) does not have injectors hidden under the valve cover. That’s odd

[skipperpete]

Originally Posted by rostyvyg

Nanni looks much more streamlined than Beta. It is narrower, access to all aggregates and systems is easier and the base Kubota engine does not have injectors hidden under the valve cover as opposed to the base Kubota engine used by Beta which has injectors under the valve cover.

This is the first I’ve heard about a Betamarine engine with injectors under the valve cover, where did you get this information. Hopefully its NOT Beta adopting the Lombardini /Kohler, (which does)

[Shaneesprit]

Originally Posted by donradcliffe

The Nanni n65 is a common rail engine, and I would avoid it if I could.

I will second this, I would never put a common rail engine in a boat. The fuel has to be like a laboratory, anything gets past a filter and it’s game over for the fuel system, that’s injectors manifolds possibly the injection pump.

I cannot think of a less suitable power system for a boat.

[Quadrille in JB]

This is a little off subject but I have had Yanmar engines in previous boats and I currently have a Kubota based engine in my boat. I love the Universal based Kubota due to its apparent high torque and the power take off driven water pump">raw water pump. You can change the impeller with shaft attached in under 5 minutes. Also, the ridiculously low price of tractor parts vs marine parts is a real attraction. I recently purchased 3 injectors for under $125 and glow plugs for $8 each. Compare that to your Yanmar. I also get outstanding fuel economy.

[rostyvyg]

Originally Posted by skipperpete

This is the first I’ve heard about a Betamarine engine with injectors under the valve cover, where did you get this information. Hopefully its NOT Beta adopting the Lombardini /Kohler, (which does)

I went all over Beta 70T at the Annapolis Boat Show this year and that is what I saw with my own eyes.

[rostyvyg]

Originally Posted by Shaneesprit

I will second this, I would never put a common rail engine in a boat. The fuel has to be like a laboratory, anything gets past a filter and it’s game over for the fuel system, that’s injectors manifolds possibly the injection pump.

I cannot think of a less suitable power system for a boat.

Correct, but Nanni N4.65 IS NOT A COMMON RAIL DIESEL!

[grantmc]

Originally Posted by rostyvyg

Well, it is not! Nanni and Beta are the only old-school mechanically fed and controlled diesels still available in the US. And the fact that they are Kubota-based is an icing on the cake.

From the Nanni brochure:
N4.65 43.4 kW [59 hp] at 2700 rpm Nanni Diesel Australia 26/17-21 Bowden Street Alexandria, NSW. 2015 Tel: +61 (0)2 9319 5222 Email: engines@nannidiesel.com.au Technical data according to ISO 8665. Specifications are subject to change without notice. All combination of equipment & accessory are not available. 03-2017A ENG TECHNICAL DESCRIPTION Engine block
� 4 Cylinders in line
� 4 Valves per cylinder
� Twin camshaft (DOHC)
� Watercooled exhaust manifold Fuel system
� Common rail fuel injection system
� Fuel filter Lubrication system
� Freplacable full-flow oil filter
� Oil dipstick Cooling system
� Closed cooling with heat exchanger
� Gear driven self-priming raw water pump
� Coolant circulating pump
� Water cooled exhaust elbow Electrical system & Instrumentation
� 12V / 120A alternator
� 12V electrical system
� Complete instrumentation including key switch and alarms
� Extension cable harness with plug-in connection Air intake
� Turbocharged Other features
� Flexible engine mounts
� Internal balancers
� Single side serviceability

[newhaul]

Originally Posted by cottonsail

3 HP per 1000 lbs. Anything less you won't be happy. Just my experience.

Rule of thumb for sailboats is 2hp per 1000 pounds displacement