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  • Neander Shark Dtorque 111; Revolutionary Compact and Powerful Turbo Diesel Marine Outboard

Neander Shark Dtorque 111; Revolutionary Compact and Powerful Turbo Diesel Marine Outboard

Neander Shark Dtorque 111

John Lehenbauer
Jun 7, 2017
Photographers: Courtesy of Manufacturer
Getting a small, compact diesel engine to provide smooth, low-vibration performance is not an easy task. Diesels inherently shake. And the fewer cylinders it has, the more an oil-burner tends to rock. This problem has limited the production and development of one- and two-cylinder engines. Enter Neander Motors, a company that understands the need for an efficient, powerful, and lightweight compact diesel engine that offers power to an array of vehicles and equipment but is also aware that the ever-present vibration issue needs to be addressed in order to have a viable product.
To solve the tremor problem, Neander allowed creative minds to be inventive and veer away from traditional engine design. What they developed is an oil-burner that uses two counter-rotating crankshafts, which nullify their own unwanted harmonics, providing a much smoother operation.
Photo 2/5   |   Neander Shark’s Dtorque 111 turbodiesel marine engine has a better torque-to-weight ratio than any gasoline-powered outboard engine in its class.
The smooth-running compact diesel design was further developed into a marine outboard version called the Dtorque 111. The 111 is a twin-cylinder, four-stroke turbodiesel that makes 50 hp and 82 lb-ft of torque.
The engine’s unique twin-crankshaft, counter-rotating operation is quite sophisticated. It works by having four lightweight connecting rods link two pistons to synchronized shafts. With the cranks synched, the rods push and pull on the pistons simultaneously. Theoretically, this design should not apply any side force on the pistons; they should travel smoothly up and down the cylinder. But in the real world, applied side forces actually do cause scuffing, sticking, or worse damage to the cylinder.
Photo 3/5   |   Visible in this top view are the two flywheels for the engine’s counter-rotating crankshafts. The shafts enable the I-2 powerplant to operate smoothly and with minimal vibration.
To eliminate unwanted pressure against the pistons, engineers developed a device they call the Spaceball: a cylindrical piece (similar to an oversized piston pin) mounted in the skirt of the piston that gives it additional freedom to move. The Spaceball works by allowing both piston pins to rotate, which all but guarantees the rods do not apply any unfavorable side forces. To keep the engine lightweight yet durable and serviceable, an aluminum cylinder block with a closed deck and pressed-in, dry, cast-iron sleeves are used. A one-piece-aluminum, eight-valve, double-overhead-camshaft cylinder head is secured to the block and bedplate with long bolts that extend from the head all the way to the bedplate’s main-bearing saddles. This design ties all the aluminum structural parts together by compressive stress, which increases their durability. A technique (used in high-performance marine engines) of connecting bolt holes—via calibrated oil bores—to the main oil galley adds damping and prevents any chance of vibrational rupture.
Photo 4/5   |   Neander Shark Dtorque 111 Side
Several other innovations are incorporated to ensure the engine is powerful and reliable. Boost comes from a water-cooled turbocharger that also utilizes an integrated charged-air cooler. A dry-sump oil system provides pressurized lubricant throughout. For maximum cooling efficiency, an Active Thermomanagement System, developed by Neander, regulates temperatures of different components throughout the engine. The Dtorque 111 meets all EU emissions standards for small marine engines.
Photo 5/5   |   Neander Shark Dtorque 111

SPECIFICATIONS

Engine: Neander Shark Dtorque 111
Displacement: 0.8L (49 ci)
Engine Layout: I-2
Valvetrain: DOHC eight valves
Bore x Stroke: 3.15 x 3.15 inches (80 x 80 mm)
Head material: Aluminum
Block material: Aluminum
Piston material: Aluminum
Power: 50 hp
Torque: 82 lb-ft
Emissions: EU standards
Induction: Water-cooled turbocharger
Exhaust: Integrated into thru-hub propeller
Intercooler: Water-to-air
Cooling System: Liquid-cooled
Fuel System: Common-rail, direct-injection
Lubrication System: Dry sump
Lubrication Capacity: 2 quarts
Dry Weight: 386 pounds
Length: 34 inches
Width: 20 inches
Height: 60 inches

Sources

Neander Shark
neander-shark.com

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