| Mercedes-Benz M08 | |
| Manufacturer: | Mercedes-Benz |
| Production: | 1928-1940 |
| Configuration: | Straight-eight |
| Bore: | NaNmm |
| Stroke: | 115mm |
| Displacement: | NaNL |
| Valvetrain: | 16-valve, DOHC, two-valves per cylinder |
| Power: | NaNhp |
| Torque: | NaNlb.ft |
| Supercharger: | Naturally aspirated Roots-type supercharger |
| Fuelsystem: | Carburetor |
| Fueltype: | Gasoline |
| Compression: | 5.0:1-6.6:1[1] |
| Oilsystem: | Dry sump |
| Successor: | Mercedes-Benz M19 engine Mercedes-Benz M07 engine |
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]
The engine was a 4,622cc straight-8 side-valve unit for which maximum output was given as 800NaN0 at 3,400 rpm
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.
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 1000NaN0 at 3,100 rpm and claimed top speed increased to 110 km/h (69 mph).[4]
In 1932 the W08 lost the “Nürburg” name, being sold simply as the Mercedes-Benz Typ 500. The 4,918cc 1000NaN0 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]
1936 saw an increase in claimed maximum output from the engine to 1100NaN0 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.