Mercedes-Benz M273 engine
The Mercedes -Benz M - 273 engine is a gasoline engine with eight cylinders in V configuration.
General
The M 273 is the evolution of M 113 From him he took over cylinder spacing and arrangement. He is technically related to the V6 petrol engine M 272, which originated in the same development cycle. The engines share especially the angle of the two cylinder banks each other and the distance between the individual cylinders.
The M 273 debuted in September 2005 in the S-Class. The engine has since been used in the E-Class and CLS, S- and R-Class, as well as in CL, SL and CLK, and the SUV ML, GL and G.
Basic technical data
- Liquid-cooled V8 four-stroke gasoline engine, 90 ° cylinder bank angle
- Cylinder spacing: 106 mm
- Aluminum engine block with cast-in cylinder liners Silitec ( an Al -Si alloy )
- Five bearings, forged steel crankshaft, connecting rods and induction hardened main bearing
- Forged crack connecting rods 70MnVS4
- Aluminum crankcase with reinforced bearing caps and spray- liners (weight 33 kg )
- Aluminum cylinder heads, each with two overhead camshafts (DOHC ), phasers and central spark plug
- Independent camshaft adjustment (designed as a fluted plate ) for the intake and exhaust
- Powered drive of the intake camshaft 8 mm duplex bushing chain, the exhaust camshaft via gears by the intake camshaft
- Four valves per cylinder
- Tumble flap in the intake channels
- Compression ratio: 10.7: 1
- Oval HFM ( hot-film air mass meter, 15 % less pressure loss than the predecessor)
- Adjustable variable intake manifold ( intake manifold ) of aluminum -magnesium alloy
- Electrically-heated 3 -Teller thermostat ( thermal management with map control )
- Secondary air
- Bosch ME9 engine control device with two microcontrollers ( 56 MHz, 2 MB Flash memory )
- Eight individual coils with pressed iron powder core and integrated drive electronics directly above the spark plug arrangement
- 90% of maximum torque is available between 2000 and 5600/min available
- Weight according to DIN 70020a: 187 kg
Stages of development
M 273 KE 46
M 273 KE 55
Problems
Basically this engine is considered to be extremely reliable.
Similarly had early models (up to September 2006) problems with a deflection in the chain drive gear of the timing chain. Mercedes used until that date unsuitable hardened material. This meant that had to be replaced in affected vehicles, the entire chain drive regularly. According to Mercedes, the spur gear was installed from engine number 088 611 in a modified version.
In addition, the manifold was repeated striking. The flaps used in plastic, which will vary the length of the intake path can, coke with time and break in extreme cases.
Successor
Successor from 2010, the motor M 278
Performance improvement
In addition to a pure electronic optimization, the result of which most providers has 316 kW specify (430 PS) and conducted in various test reports to a significant improvement in acceleration to 200 km / h ( approx. 3 s), are more complex conversions with other camshafts and valve springs available (approx. 460 hp).
Without admissibility within the scope of the Road Traffic Act and the headers are available. It should be noted however imperative that this may void the guarantee. Moreover, by A possibly deteriorated exhaust emissions, a tax offense could be met.