Volvo Penta is continuously collecting experiences from their products. The experience after more than 100 000 units built of the D4/D6 engines, has led to improvements on 75 % of the components.
Reduced maintenance costs
The annual maintenance cost has decreased by approximately 30 %. The service interval for the gearbox and engine is now the same. On these new models you will find an indicator at the engine panel, showing when a service is required.
Better torque – Less fuel consumption
The fuel consumption is also reduced with the new engine models. The new D4-175 has a considerably improved torque, but not at top RPM where the output is measured. As a sailing boat does not use the top RPM, but cruises usually around 1 500 RPM, you now get a great advantage with the improved torque, from good 382 Nm to as much as 439 Nm. This is particularly valid if this torque is combined with a Gori propeller in overdrive mode, that takes advantage of the approximate 15 % increase in torque at 1500 RPM to gain lower RPM keeping the same speed, lower noise, less vibration, lower fuel consumption and longer range at cruising speed.
Further improved reliability and service life
Furthermore a lot of attention has been paid to improve the parts that take most load and wear. High load components like bearings, crank shaft and pistons are now more robust. This is also the case for components used for lubrication of the engine; oil filter, oil cooler and the corresponding sensors have all been improved. This increases reliability and gives a longer service life.
The emissions have also been reduced. The technology fulfils all current and known future environmental requirements for all markets.