Mercedes-Benz M 129 petrol engine

Mercedes Benz
M 129
Manufacturer:	Daimler Benz
Production period:	1965-1968
Style:	Six-cylinder - inline engine
Combustion principle:	gasoline engine
Previous model:	Mercedes-Benz M127
Successor:	Mercedes-Benz M 130

The Mercedes-Benz M 129 was a 1965 to 1969 of Daimler-Benz -made six-cylinder - inline engine with intake manifold injection and 2.5 liters displacement . It was the injection version of the simultaneously produced carburettor engine M 108 .

With intake manifold injection and the increased compression ratio (increase from 9: 1 to 9.3: 1 or 9.5: 1 from 1966) this achieved a significant increase in performance compared to the carburetor model. Otherwise, the unit remained essentially unchanged.

Technical data 

• Six - cylinder inline engine ; Engine block from cast iron ; Cylinder head made of aluminum alloy
• Crankshaft with seven main bearings
• OHC valve control : a camshaft in the cylinder head; two valves per cylinder
• Intake manifold injection via mechanical Bosch 6-piston injection pump with map control
• Bore x stroke : 82 mm × 78.8 mm
• Displacement : 2496 cc
• Compression ratio : 9.3: 1 (9.5: 1 of 1966);
• Performance: 150 hp at 5500 rpm
• Torque: 216 Nm at 4200 rpm

Use 

• Mercedes-Benz W111 250SE Coupe / Cabriolet (1965-67).
• Mercedes-Benz 250SE W108 (1965-68).
• Mercedes-Benz 250 SL "Pagoda SL" (1966-68).