Engine for Mercedes Benz W221 C216 5.5 S CL 500 273.961 M273.961
The Mercedes-Benz M273.961 is a 5.5-liter naturally aspirated V8 gasoline engine produced between 2005 and 2013. Featuring a dual overhead camshaft (DOHC) design and renowned for its smooth power delivery and reliability, the engine produces 388 horsepower (285 kW) and 391 lb-ft (530 Nm) of torque.
Description
Key Technical Specifications
Engine Type: 90° V8, naturally aspirated
Engine Code: M273.961 (part of the M273 E55 series)
Displacement: 5,461 cc (5.5 L)
Bore: 98 mm (3.86 in)
Stroke: 90.5 mm (3.56 in)
Compression Ratio: 10.7:1
Valvetrain: DOHC (Double Overhead Camshaft), 4 valves per cylinder
Valve Timing: Continuously variable valve timing (VVT) for intake and exhaust
Fuel System: Sequential multi-point fuel injection
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