For Benz W221 S 500 L 5.5L 7A/MT M273.961 gasoline engine
The Mercedes-Benz M273.961 is a naturally aspirated 5.5-liter (5,461 cc) 90-degree V8 engine that produces 388 horsepower (285 kW) at 6,000 rpm and generates 391 lb-ft (530 N·m) of torque; this engine was primarily featured in the 2005–2013 W221 S-Class and C216 CL-Class models (S500/CL500). Its key technical features include an all-aluminum alloy construction, a four-valve-per-cylinder design, and a variable valve timing system.
Description
Engine Specifications (M273.961):
Engine Type: V8, 4-stroke, Gasoline Engine
Displacement: 5,461 cc (5.5 L) · Bore × Stroke: 98 mm × 90.5 mm
Max Power: 388 PS (382 hp / 285 kW) at 6,000 rpm
Max Torque: 530 N·m (391 lb-ft) at 2,800–4,800 rpm
Compression Ratio: 10.7:1
Valve Train: DOHC (Double Overhead Camshaft), 4 valves per cylinder (32 valves total)
Fuel System: Gasoline Direct Injection
Applicable Models:
Mercedes-Benz S-Class (W221): S 500 / S 550
Mercedes-Benz CL-Class (C216): CL 500 / CL 550
