Mercedes-Benz 300SL 3D Frame

The Mercedes-Benz 300 SL (chassis code W 198) is a two-seat sports car that was produced by Mercedes-Benz from 1954 to 1957 as a gullwinged coupé and from 1957 to 1963 as a roadster. The 300 SL traces its origins to the company’s 1952 racing car, the W194, and was equipped with a mechanical direct fuel injection system that significantly increased the power output of its three-liter overhead camshaft straight-six engine.

The 300 SL was capable of reaching speeds of up to 260 km/h (162 mph), earning it a reputation as a sports car racing champion and making it the fastest production car of its time. The car’s iconic gullwing doors and innovative lightweight tubular-frame construction contributed to its status as a groundbreaking and highly influential automobile.

The Mercedes-Benz M198 engine is a water-cooled 3.0 L, 182.8 cu in, 2,996 cc overhead cam straight six. Like the racing Mercedes-Benz M194, the 300 SL borrowed the basic two-valves-per-cylinder M186 engine from the regular four-door 300 (W186 “Adenauer”) luxury touring car introduced in 1951.

It featured the M186’s aluminum head: a 30-degree diagonal base, allowing larger intake and exhaust valves than a standard horizontal joint with the engine block. To improve performance, the M198 replaced the W194’s triple two-barrel Solex carburetors with a Bosch mechanical fuel-injection system. This raised output on the 300 SL from 175 hp (130 kW; 177 PS) SAE gross to 240 hp (179 kW; 243 PS) SAE gross at 6,100 rpm. Compression was set at 8.55:1.