Mercedes cars are famous for their powerful and reliable engines. Many car owners have already seen this. But the German manufacturer produces a variety of motors. Some are more economical, others are more powerful. Among the most optimal is the M111 engine. What kind of motor is this and what characteristics does it have? Consider in our article today.
Description
The Mercedes 111 engine is an in-line four-cylinder gasoline engine. It first appeared in the year 92 and replaced the old M102. I must say that the new Mercedes 111 engine was developed from scratch, and did not become a modified version of the previous one. So, the motor received a compact cast-iron block, another crankshaft and a connecting rod-piston group. The head of the block became 16-valve. Also, the engine is distinguished by electronic injection and hydraulic lifters. The diameter of the exhaust and intake valves is 31 and 35 millimeters, respectively.
The engine was not only atmospheric - there were compressor modifications. As a supercharger, the Iton M62 compressor was used.
The gas distribution mechanism of the Mercedes 111 motor is chain. The resource of the chain is 250 thousand kilometers. For comparison, the old M102 engine needed to be replaced every 120 thousand. The engine management system is Bosch ME 2.1.
Modernization
8 years after the release, the motor received an upgrade. So, in the unit pistons and rods were replaced under an increased compression ratio. The cylinder block received additional stiffeners. The head of the block has also been improved. It has modified channels and a combustion chamber. Also on the engine appeared individual ignition coils. Nozzles and candles were replaced. The unit has become more environmentally friendly. An electronic throttle appeared. On compressor motors, the supercharger was replaced by the Eaton M45. The control system has also been replaced. Instead of Boshevsky, the Siemens electronic unit is installed.
Specifications
So, the M111 engine is an in-line four with injector injection and a 16-valve head. The cylinder diameter is 89.9 mm. The piston stroke is 78.7 mm. The compression ratio of the unit is from 8.5 to 10.6. The working volume of the unit is 1998 cubic centimeters. The maximum power depending on the modification is from 129 to 192 horsepower. Torque - from 185 to 250 Nm. The engine is designed for 95th gasoline. Conforms to the environmental standard Euro-3. After modernization, the unit began to meet the requirements of Euro-4.
What dynamic characteristics does this motor have? On average, Mercedes with this engine accelerated in 10.6 seconds. The maximum speed is 210 kilometers per hour. The best dynamic performance was on machines on the mechanics. But basically, the M111 was equipped with a four-speed automatic. As for fuel consumption, it ranged from 7 to 14 liters depending on operating conditions (highway and city, respectively). On the machine, the flow rate was always greater.
What cars were installed on?
Basically, this motor was placed on C-class cars. This is the Mercedes in the 202nd and in the 203rd body. Also, the unit can be found on CLK cars (only compressor ones were put here). In addition, the Mercedes 111 engine was installed on a business class model. These are the late 124th bodies and the 210th Mercedes. In rare cases, such a motor can be found on a Vito minibus. It was not put on other cars of this brand.
Disadvantages and problems of the motor
Among the popular problems, reviews note oil leakage. The reason for this is increased wear on the head gasket. The problem is solved by replacing the sealing element. The next problem is power loss and increased fuel consumption. This phenomenon occurs due to a malfunction in the air mass meter. Its resource is about 100 thousand kilometers.
Among the "childhood illnesses" owners note increased noise. This drawback cannot be eliminated in any way. The motor also requires frequent replacement of spark plugs. Their resource is about 20 thousand kilometers. The water pump serves about 100 thousand. On a run for 200, the owner may encounter such a phenomenon as cracks in the exhaust manifold. Otherwise, the engine is very reliable and does not cause problems to the owner.
Service
This unit needs an oil change every 10 thousand kilometers. In case of extreme operation (frequent traffic jams, high loads), the oil needs to be changed every 7 thousand. You need to use high-quality synthetics. Viscosity can be different - from 0W-30 to 15W-40.
The filling volume is 5.5 liters on engines before modernization and 7 on internal combustion engines after modernization in 2000. Antifreeze should be replaced once every 5 years, or every 150 thousand kilometers. G12 coolant is suitable here.
Tuning
Very often a compressor is installed on atmospheric units. Thus, you can increase power without losing a resource. If you perform the firmware, you can increase the power to 210 horsepower. Another common tuning option is to replace the exhaust with a sports one. Thus, you can increase power by another 5 percent.
But experts do not advise installing the turbine. In this case, you need to finalize another half of the motor. And how this will affect the resource, no one can predict.
To summarize
So, now we know what the Mercedes 111 engine is. This engine has a high resource and is not demanding in maintenance. If you are wondering about what kind of a good engine you can take, it’s definitely worth considering buying an M111. This unit does not have complex injection systems or technologies for changing the valve timing. Therefore, the Mercedes 111 motor is one of the most reliable in the lineup.