System comparison Overview 10 Introduction of New Generation of 4-Cylinder Inline Engines, OM 651 q – This printout will not be recorded by the update service. Status: 09 / 2008 – Comparison Engine 646.821EVO C 220 CDI Engine 651.911 C 250 CDI Market launch 06 / 2006 10 / 2008 Combustion system Diesel direct injection No.
of cylinders 4 Engine configuration Inline Bore mm 88.3 83.0 Stroke mm 88.3 99.0 Compression ratio e 16.5:1 16.2:1 Camshafts – drive Duplex chain Simplex chain Camshafts – number 2 2 Valve actuation Cup tappet with hydraulic valve clearance compensation Roller-type cam follower with hydraulic valve clearance compensation Turbocharger type 1-stage turbocharging with variable turbine geometry 2-stage turbocharging with fixed geometry Boost pressure control Electric Pneumatic Measures for low-emission combustion Intake port shutoff, exhaust gas recirculation (EGR) with separate EGR cooler Intake port shutoff, EGR cooling and EGR bypass Fuel injector – type Solenoid injector Directly controlled piezo injector Fuel injector – diameter mm 17 19 Firing order 1-3-4-2 Oil pump – drive Simplex chain Gear drive Alternator – current rating A 200 180 Engine weight DIN (dry) approx.
kg 190 203