Mercedes-Benz M112 engine

The M 112 is a V6 petrol engine from Mercedes -Benz, which was introduced in March 1997 in the E-Class of the 210 series. He replaced the M 104. In 2004, the successor M 272 was presented.

The M 112 is technically related closely with the V8 M 113. Both have a cylinder spacing of 106 mm and an angle of 90 ° between the cylinder banks. They can be manufactured in large part to the same production facilities in and there are many identical parts. Both have an engine block made ​​of light alloy with cast-in cylinder liners Silitec (Al -Si alloy ) and a light alloy cylinder head with overhead camshaft per cylinder bank.

The four -bearing crankshaft has crank pins shared for even firing intervals of 120 ° crank angle. They sit next to each other without intermediate web in order to not increase the displacement of the cylinder banks and thus the overall length of the engine must. On the crankshaft in the cylinder V is seated a balancer shaft that rotates counter to the crankshaft at the same speed. Thus, the inertial forces and moments of the first order to be fully compensated. Camshaft and balance shaft are driven by a double roller chain.

As the M 113, the M 112 two intake valves and one exhaust valve per cylinder, actuated via light metal roller rocker with hydraulic valve clearance compensation. Through the single exhaust valve, a smaller surface area of the exhaust port, thereby giving especially when engine is cold less heat loss from the exhaust gas at the cylinder head. The catalyst achieved its operating temperature faster. Also contribute to the thin - and double-walled sheet metal exhaust manifold that absorb very little heat.

Each combustion chamber there are two spark plugs left and right next to the outlet valve. The arrangement of valves and candles is symmetrical. The dual ignition system works with simultaneous activation of the two candles. This achieves a rapid and uniform combustion, greater security against misfires and higher tolerance to leaner mixture and exhaust gas recirculation. Since the dual ignition increases the heat load on the piston, it is cooled by oil spray nozzles, spray the engine oil from below the piston crown. The candles in each combustion chamber are also driven by a working stroke to the next in an alternating order. This results in a more uniform and lower heat load of the piston and even burn both candles.

The M 112 was there with 2.4 to 3,7 liters displacement.

Data

  • M = Motor, 112 = Series, E = manifold injection, 24 = Displacement ( 2.4L ), ML = compressor ( Mechanical loader ).

Use

M 112 E 24

M 112 E 26

M 112 E 28

M 112 E 32

M 112 E 32 ML

M 112 E 37

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