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N3.21

Product catalog summary

Specifications
The Nanni N3.21 propulsion engine is a 3-cylinder, 4-stroke diesel engine with a power output of 14.61 kW (19.6 hp) at the crankshaft. It has a displacement of 0.719 liters and operates at a rated speed of 3600 rpm. The engine features a bore and stroke of 67 x 68 mm and a compression ratio of 23.5:1. It is equipped with a mechanical direct injection fuel system and a closed cooling system with a heat exchanger. The engine complies with RCD 2013/53/EU and EPA marine Tier 3 emissions standards.

Technical Description
The engine block consists of 3 cylinders in line with a gear-driven valve train and a water-cooled exhaust manifold. The fuel system includes a mechanical governor, cam-driven in-line injection pump, and a fuel feed pump with a hand primer. The lubrication system features a replaceable full-flow oil filter and an oil drain pump. The electrical system operates at 12 volts with a 70 A alternator and includes an electric starter motor and stop function.

Performance and Ratings
The engine is rated for up to 1000 annual operating hours with a load factor of up to 35%. Full power can be used for no more than 30 minutes out of each 8 hours of operation. The engine's peak torque is 47 Nm at 2600 rpm. Performance curves indicate power at various rpm levels, with a maximum power output at 3600 rpm.

Optional Equipment and Accessories
Options include keel cooling adaptation, complete marine propulsion systems, throttle and shift controls, additional instrumentation, and various mounting adaptations. The engine can be paired with different transmission models, including the TMC40 and Sail Drive SP60.

Dimensions and Weight
The dry weight of the engine is 106 kg, increasing to 142 kg with the Sail Drive SP60. The maximum mounting angle is 15° front up or down.

Catalog excerpts

Propulsion engine Displacement Configuration Operation type Bore & Stroke 14.61kW [19.6 hp] 0.719 l [44 in3] 3 cylinders in line 4 stroke Diesel Engine base Fuel system Mechanical Direct injection Cooling Closed cooling with heat exchanger Compression ratio Rated speed Idling speed Peak torque Peak torque speed Dry weight with TMC40 with Sail Drive SP60 Emission compliance RCD 2013/53/EU Find a Nanni dealer near you on

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TECHNICAL DESCRIPTION PERFORMANCES CURVES Power at crankshaft Engine block ■ 3Cylinders in line ■ Gear-driven valve train ■ Water cooled exhaust manifold Fuel system ■ Mechanical governor ■ Cam driven in-line injection pump ■ Fuel feed pump with hand primer ■ Fuel filter Lubrication system ■ Replaceable full-flow oil filter ■ Oil dipstick ■ Oil drain pump Cooling system ■ Closed cooling with heat exchanger ■ Gear driven self-priming raw water pump ■ Coolant circulating pump ■ Water cooled exhaust elbow Electrical system & Instrumentation ■ 12 V Electrical system ■ 12 V 70 A alternator ■ Electric...

Open the catalog to page 2