Power, comfort and low emissions

With the launch two years ago of D2-55, Volvo Penta further strengthened its position as a supplier of drive systems for sailboats. Volvo Penta is now following its recent success with the launch of the new D2-75 – a compact, four-cylinder marine diesel engine developed primarily for sailboats, but also for smaller motorboats. The new 75-hp engine operates at low rpms and offers exceptionally powerful torque and low emissions – qualities that make it perfect for the engine’s application areas. The engine also comes with a new version of Volvo Penta’s well-known Saildrive.
Volvo Penta’s compact 1-2 liter engines have achieved significant success in recent years, particularly among sailboat builders in all parts of the world. Completely standard models of the engines from the same engine family were installed in 2001 in all oceangoing yachts that competed in the Volvo Ocean Race.

The engines passed this very grueling test with flying colors. And when Volvo Penta later launched the D2-55 model, it quickly became a success.

The new D2-75 is basically the same engine complemented with wastegate turbo and charge-air cooling.

“Our most important consideration during development of the D2-75 was to build a low rpm engine. In most installations, the engine will operate at about 2,500 rpm at cruising speed for really low levels of sound and vibrations. The  low rpms also creates opportunities to use larger propellers that in turn generate higher power output and a further reduction in vibrations,” says Bror Gustavsson, project manager at Volvo Penta.
The engine’s torque is powerful over the entire rpm range, with a maximum of 210 Nm at 2,000 revolutions per minute at cruising speed. It provides the operator with plenty of power for simple and safe maneuvering.

“D2-55 and D2-75 both have such powerful torque that they fare extremely well in comparison with larger engines. We have achieved very good results with the D2-55 in a 45-foot sailboat, a boat that would normally have an engine with a higher power output,” says Bror Gustavsson.

Low emissions
Newly developed pistons and combustion chambers combined with effective turbo and charge-air coolers keep exhaust emissions at a minimum. The D2-75 will meet the comprehensive future requirements planned for introduction in Europe and the US in 2006.

“The D2-75 operates with highly sophisticated, mechanical indirect fuel injection, a technology that enables us to meet all current emission specifications,” says Tommy Källberg, a member of Volvo Penta’s product development team.

Today’s boat owners are installing more and more electrical-consumption devices on their boats, ranging from navigation and communications equipment to lighting. The new D2-75, therefore, has been equipped with a powerful 115 amp alternator. Combined with Volvo Penta’s integrated charge sensor, it provides a powerful charge that meets virtually all requirements. Accessory equipment also includes a 220-volt alternator that can provide 2.2 or 3.5 kW alternating current 50Hz.

The engine is compact and easy to install, which makes it very suitable for repowering. The service requirement is reduced with oil change only after 400 hours, but at least once a year. The engine is shut down electrically using the key.

New S-drive
When Volvo Penta introduced S-drive in 1973, it was a completely new engineering concept. It offered easier installation for boat builders and better comfort with less vibration for boat owners.

“With 30 years of experience, we can now see that the reliability is really excellent. The sailing yachts that competed in Volvo Ocean Race all had S-drives and they functioned extremely well,” says Bror Gustavsson.

With the new 150 S-drive, Volvo Penta has increased the power output range for S-drivelines to 75 hp. The 150 S also offers some interesting new features: it is now possible, for instance, to change the oil in the driveline from inside the boat, and the anode is split so that it can be replaced without dismantling the propeller. The driveline can be turned 180 degrees, so the engine can be placed in the front or back of the boat.

In addition to the S-drive, the D2-75 is also available with straight or down angled gearboxes and a selection of ratios.

Volvo Penta offers a large range of fixed and folding propellers. The new four-blade folding propeller is extremely suitable for D2-75 with its strong power and quiet operation.

Technical data
Engine model: D2-75
Crankshaft power: 75 hp at 3,000 rpm
Maximum torque: 210 Nm at 2,000 rpm
Configuration: In-line four-cylinder, with turbo and charge-air cooler
Alternator: 115 A
Cylinder volume: 2.2 liters
Weight, excl. trans: 240 kg
Emissions: Will meet future comprehensive requirements to be introduced in Europe and the US in 2006