Mercedes-Benz OM 660
The engine type OM 660 is a diesel engine from Mercedes-Benz with a displacement of 799 cm³. The production of the three-cylinder - line engine began in 1998 in what was then DaimlerChrysler -Werk Berlin-Marienfelde before 2007, production in the Thuringian Kölleda for Daimler subsidiary MDC Power was transferred. The final assembly is carried out on behalf of Smart by ThyssenKrupp Automotive in one of the four branches of the cross-shaped Smartville plant in Hambach (Lorraine).
The engine has a turbocharger with a maximum boost pressure of 0.8 bar, two valves per cylinder and a camshaft in the cylinder head .
The OM 660 DE 8 LA * has a bore of 65.5 mm and a stroke of 79 mm.
With its capacity of initially 30 kW (41 hp) at 4200 min -1 it is one of the less powerful and efficient car engines. Smart cars equipped with this unit ( Coupé and Cabriolet two-seater of the ForTwo model) have the CDI designation on the rear, which Mercedes-Benz uses for all vehicles with common rail direct injection . The internal type designation OM 660 is derived from the O el M otor used in Mercedes vehicles for diesel engines and a largely chronological numbering.
The engine is a so-called block engine . The gearbox is interlocked with the motor. It is an electrically controlled semi-automatic gearbox that can be programmed and operated in several variants thanks to different software equipment. The automatic dial-up versions of the same block motor concept, which are basically identical in construction costs, are marketed as higher quality and sold to the end customer for a significant additional price.
One point of criticism of this drive concept in the early years of the Smart was the slow shifting behavior of the automatic. By changing the gearbox design, this issue can now be viewed as a constructive solution.
After the three-liter vehicles of the VW group ( VW Lupo 3L-Diesel, Audi A2 TDI) were discontinued, the smart engine with a nominal consumption of 3.3 liters of diesel per 100 km is the most economical (as of mid-2007) production car engine in ongoing production.
For the new edition of the “Smart ForTwo” with 20 centimeters longer, which was launched in 2007, the output of the small diesel engine was increased to 33 kW (45 PS) and, as part of the model update, to 40 kW (54 PS) from the 2011 model year. The increase in performance takes place via a new common rail injection system with a minimum injection nozzle pressure of 1,600 bar. With emissions of less than 90 grams of CO 2 , this type of engine is well positioned in the current environmental debate.
Just like the smart M 160 gasoline engine (also developed by Mercedes-Benz), the OM 660 is offered by the supplier Ecofly as an aircraft engine for ultralight and light aircraft as well as for motor gliders. Among other things, it is used in the B&F FK 9 . For this purpose, Ecofly has developed a complete electronics conversion kit with the support of Mercedes-Benz. With the model variant 'FK9 smart' of the B&F FK 9, the company B&F Technik Vertriebs GmbH was the first to equip an ultra-light aircraft with smart motors as standard.
In the Jetcar 2.5 , the old, 41 hp variant is used as the engine.
* Engine designation is encoded as follows: OM = oil engine (diesel), series = 3 digits, DE = direct injection, displacement = deciliters (rounded), L = charge air cooling, A = exhaust gas turbocharger