![]() 2005–2014 W639 Viano (known as the M272 978 in China)īalance shaft gear and other issues.This was achieved by raising the rev-limit to 7200 rpm, increasing the compression ratio using enhanced, weight-optimized pistons with a curved surface, reinforcements in the area of the piston pins, deeper pockets for the valve seats, single-stage intake manifold, lightweight valves with sodium cooling, conical valve springs, tri-oval chain sprocket, and a new cylinder head. First fitted to the CLS350 CGI, it produces 292 PS (215 kW 288 bhp) and 365 N⋅m (269 lb⋅ft) of torque while lowering fuel consumption. A direct injected variant debuted in 2006 under the name Stratified-Charged Gasoline Injection (CGI). ![]() ![]() Also tumble flaps are used to improve output at low engine speeds. New electronic coolant flow control has replaced the mechanical thermostat for improved engine warm-up and optimum control of engine temperature. The twin spark plug system was replaced by a regular single spark plug per cylinder. Featured on both the intake and exhaust camshafts, each can be varied through a range of 40 degrees. A dual-length Variable Length Intake Manifold is fitted to optimize engine flexibility.Ĭontinuous VVT was adopted for the first time. This essentially eliminates first and second order moments. Like the M112, a balance shaft is installed in the engine block between the cylinder banks to deal with vibrations in the 90 degree V6 design. All have forged steel connecting rods, one-piece cast crankshaft, iron-coated aluminum pistons and a magnesium intake manifold. The aluminum DOHC cylinder heads have 4 valves per cylinder. Introduced in 2004, it is based on the M112 V6 introduced in 1998.Īll M272 engines have aluminum engine blocks with a 90° V-angle with silicon/aluminum lined cylinders. The Mercedes-Benz M272 engine is an automobile piston V6 engine family used in the 2000s (decade).
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