This engine allows both high performance and low fuel consumption. The top version with 70 kW is the world’s most powerful 3-cylinder passenger car diesel engine. For the joint project Smart For four and Mitsubishi Colt, Mercedes-Benz developed a 3-cylinder diesel engine derived from the A-Class 4-cylinder engine.
The stringent guidelines for exhaust emission level Euro 4, as well as fuel consumption, performance, comfort and low manufacturing costs led to a solution with the following characteristics : – transverse, front installation – unified combustion chamber as in other Mercedes-Benz CDI engines going on the market in 2004 – four-valve design with built camshafts and roller cam followers – swirl generation through tangential and spiral intake with infinitely variable swirl control – exhaust gas turbocharging – cooled exhaust gas recirculation – second-generation common rail fuel-injection system with 1600 bar and solenoid valve injectors – balancer shaft – dual-mass flywheel – engine (transmission) control unit (with Green Oak processor) – powertrain designed for peak pressures of up to 180 bar – engine mounting as roll axis system.

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