Mercedes-Benz M180 engine

Mercedes-Benz M180
Mercedes-Benz M180
	M130 engine of a 1971 280SL
Overview
Manufacturer	Daimler-Benz
Designer	Wolf-Dieter Bensinger
Production	1951-1985
Layout
Configuration	Inline-6
Displacement	2.2 L; 134.0 cu in (2,196 cc); 2.3 L; 140.8 cu in (2,307 cc); 2.5 L; 152.3 cu in (2,496 cc); 2.8 L; 169.5 cu in (2,778 cc);
Cylinder bore	80 mm (3.15 in); 82 mm (3.23 in); 86.5 mm (3.41 in);
Piston stroke	72.8 mm (2.87 in); 78.8 mm (3.10 in);
Valvetrain	SOHC 2 valves x cyl.
Combustion
Fuel system	Solex carburetor; Mechanical fuel injection
Management	Bosch D-Jetronic
Fuel type	Gasoline
Cooling system	Water cooled
Output
Power output	80–134 bhp (60–100 kW; 81–136 PS)
Chronology
Predecessor	Mercedes-Benz M153 engine (pre-war); Mercedes-Benz M189 engine (of M130);
Successor	Mercedes-Benz M110 engine (of M130); Mercedes-Benz M103 engine (of M123);

The Mercedes Benz M180 engine is a 2.2 L; 134.0 cu in (2,196 cc) single overhead camshaft inline-6 cylinder engine introduced at the Frankfurt Motor Show in April 1951 to power the company's new 220 (W187). Utilizing a reverse-flow cylinder head and available in both carbureted and fuel injected versions, it had an "over-square" bore × stroke of 80 mm × 72.8 mm (3.15 in × 2.87 in), the first engine with a cylinder bore greater than its stroke that Mercedes had installed in a production car.

It spawned numerous variants (M127/M127II, M129/M108, M114, and M130) through 1968, adding various carburetor combinations, fuel-injection, increasing the number of bearings, and being produced in 2.3 L, 2.5 L, and 2.8 L versions.

At the 1951 Frankfurt Motor show Mercedes also unveiled the larger 3.0-litre M186 "big six" inline-six to power its new flagship 300 (W186) Adenauer range.

While sharing many design features such as staggered valve arrangement and rockers running off a single overhead camshaft driven by a duplex cam-chain, the engines were of completely different design with little or no inter-changeability of parts.