What should I replace my BMC 1.5 engine with?
The BMC 1.5 engine is 35hp @ 3500 rpm with a maximum torque of 80Nm @ 2500 rpm. You can find this engine fitted in boats from 25ft to 40 ft with a variety of gearbox options.
The options from Nanni would be the N4.38 for motorboats up to 30ft, yachts up to 36ft and the N4.50 for boats Up to 40 ft.
The Nanni N4.38
The N4.38 is 37.5hp @ 3000rpm with a maximum torque of 94.8 Nm @ 2200rpm
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The Nanni N4.50
The N4.50 is 47.5hp @ 2800 rpm with a maximum torque of 146 Nm @1800 rpm
Click on image to enlarge
Why the two options to replace the BMC 1.5?
It is a costly operation to replace a boat engine and a large part of the cost is the installation. Ware as the difference in the engine cost between the N4.38 and the N4.50
Although not insignificant, the upgrade would be well worth it on the bigger boats.
As the overall size of the N4.50 is similar to the BMC1.5 there are no issues with the upgrade.
Although this can be discussed with our technical team to come to the best option for your boat.
What’s involved in the replacement?
Once the decision on the best engine option is made, we need to consider the best gearbox and ratio for the boat.
Nanni offer both mechanical and hydraulic options.
It may be the gearbox has been replaced at some point and can be fitted to the new engine. If for instance you have a Borg warner due to the cost of a new one and the installation implications with them being a inline output box it could be the best option is to have us recondition the current gearbox. This can then be fitted to the new engine and painted to match.
Instrument options
The standard panel options are the A4 the upgrade is the C4, we also offer several custom options to suit the boat.
Engine mounting feet.
There are several custom feet options that may match the current bed however there are many versions of the BMC 1.5 so a measure up will be required.
Diagram
Propeller
This will depend on the engine choice, gearbox ratio and what size can be fitted,
We can advise the best option for the boat once we have this information.
No doubt there will be various parts required to complete the installation e.g.
Hoses, control heads and cables, electrical components all of which we can supply as part of the engine package.
To see the full specification of our N2.10 and N2.14 Engines in the current engine range, use the links below:
N4.38
N4.50
