The Mercedes-Benz M08 engine is a naturally-aspirated and supercharged, 4.6-liter and 5.0-liter, straight-8 engine, designed, developed and produced by Mercedes-Benz; between 1928 and 1940.[2][3]
| Mercedes-Benz M08 | |
|---|---|
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | 1928-1940 |
| Layout | |
| Configuration | Straight-eight |
| Displacement | 4.6–5.0 L (281–305 cu in) |
| Cylinder bore | 80–82.5 mm (3.1–3.2 in) |
| Piston stroke | 115 mm (4.5 in) |
| Valvetrain | 16-valve, DOHC, two-valves per cylinder |
| Compression ratio | 5.0:1-6.6:1[1] |
| Combustion | |
| Supercharger | Naturally aspirated Roots-type supercharger |
| Fuel system | Carburetor |
| Fuel type | Gasoline |
| Oil system | Dry sump |
| Output | |
| Power output | 79–110 hp (59–82 kW) |
| Torque output | 175–190 lb⋅ft (237–258 N⋅m) |
| Chronology | |
| Successor | Mercedes-Benz M19 engine Mercedes-Benz M07 engine |
Overview
Typ Nürburg 460 engine (1928–1929)
The engine was a 4,622cc straight-8 side-valve unit for which maximum output was given as 80 PS (59 kW; 79 hp) at 3,400 rpm
Typ Nürburg 460 engine (1929–1932)
For 1929, the company's first eight-cylinder model was extensively reworked by the newly appointed Technical Director Hans Nibel. The 8-cylinder engine and most other technical details were carried over unchanged from the 1928 car including the ratios chosen for the four-speed manual transmission.
Typ Nürburg 500 engine (1931–1933)
In 1931, the car became available with an enlarged 4,918cc engine which now also featured a twin downdraft carburettor. Maximum output was now listed as 100 PS (74 kW; 99 hp) at 3,100 rpm and claimed top speed increased to 110 km/h (69 mph).[4]
Typ 500 engine (1932–1936)
In 1932 the W08 lost the “Nürburg” name, being sold simply as the Mercedes-Benz Typ 500. The 4,918cc 100 PS (74 kW; 99 hp) side-valve engine with its twin downdraft carburetor was unchanged, as were the four-speed optional overdrive transmission, wheelbase, and list of standard body types.[5]
Typ 500 engine (1936–1939)
1936 saw an increase in claimed maximum output from the engine to 110 PS (81 kW; 108 hp) at 3,300 rpm. The cylinder capacity at 4,918cc was unchanged, but there was a marginal raising of the compression ratio. The claimed top speed was now raised further to 123 km/h (76 mph).[6] The model was discontinued in 1939 without any immediate successor. Twenty-four years passed before the next 8-cylinder engined Mercedes-Benz appeared; with the Mercedes-Benz 600, in 1963.