Mercedes-Benz M180 engine

Mercedes-Benz M180
Mercedes-Benz M180
	M130 engine in 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); 2.3 L; 139.9 cu in (2,292 cc); 2.5 L; 152.3 cu in (2,496 cc); 2.5 L; 154.1 cu in (2,525 cc); 2.8 L; 169.5 cu in (2,778 cc);
Cylinder bore	80 mm (3.15 in); 82 mm (3.23 in); 86 mm (3.39 in); 86.5 mm (3.41 in);
Piston stroke	72.4 mm (2.85 in); 72.8 mm (2.87 in); 78.8 mm (3.10 in);
Valvetrain	SOHC 2 valves per cylinder
Combustion
Fuel system	Solex or Zenith carburettors Bosch mechanical or D-Jetronic fuel injection
Fuel type	Petrol
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 (for M130);
Successor	Mercedes-Benz M110 engine (for M130); Mercedes-Benz M103 engine (for M123);

The Mercedes-Benz M180 (along with the related M127, M108, M129, M130, M114, and M123) is a family of single overhead camshaft inline-6 internal combustion engines used in Mercedes-Benz vehicles from the early 1950s to the mid‑1980s. Featuring a reverse-flow cylinder head, staggered valve arrangement, and rockers actuated by a single overhead camshaft driven by a duplex chain, these engines were produced in both carburetted and fuel‑injected versions with displacements ranging from 2.2 to 2.8 litres.

The original design is a 2.2 L (2,196 cc; 134.0 cu in) single overhead camshaft inline-six internal combustion engine introduced at the Frankfurt Motor Show in April 1951 to power the company's new 220 (W187).

Although introduced in parallel with the M186 “big six,” that engine family (M188, M189, M194, M198, M199) is of completely different design with little or no part interchangeability. The M180, however, influenced the design of Mercedes‑Benz’s OHC four‑cylinder engine, the M121 in 1955, sharing not only the architecture but many components. It in turn influenced its diesel sibling, the OM621, in 1958. These evolved into the M115 and OM615 engines in 1968. The diesel range later expanded into the larger‑displacement OM616 in 1973 and the five‑cylinder OM617 in 1974.