The new family of Mercedes-Benz engines has been developed to offer maximum efficiency, flexibility, dynamics, and fitted with knock intelligence for early detection. However, detonation commonly known as engine knock is the not so silent killer of your Mercedes-Benz engine, but can practically ground your masterpiece of elegance from inside out only when you use low-performance gasoline.
What Is Engine Knock?
A combustion engine is normally designed to run smoothly right from ignition to engine shut-down. However, there are times you can detect some noise coming from the engine of your car that is hard to diagnose. The underlying cause of the unidentified sound, especially the ‘knocking’ sound could be as a result of engine knock.
Engine knock occurs when air-fuel mixture in the engine is incorrect, resulting in the fuel burning in uneven pockets rather than the expected uniform burst. When one giant fireball is not achieved at compression phase but rather pockets of fuel burns, shock waves at the wrong time exerts immense pressure on the engine cylinder.
Besides, when fuel is ignited prematurely before the piston reaches the top dead end, it can force the engine crank to run backward. Besides, when a premature ignition occurs it often takes place when the intake valve has not fully closed, thus the flame front will burn through the intake part of the engine. For these reasons, various components of the engine are subjected to intense stress and are susceptible to damage. If left unattended to, engine knock can destroy your priceless Mercedes-Benz engine.
What Causes Engine Knock?
Under ordinary circumstances, the fuel-air mixture should burn in an orderly and controlled manner. However, when you use gasoline that has a too low mixture of an octane rating contrary to the manufacturer’s recommendation, the fuel will burn unevenly resulting in shock waves that can shatter your cylinders.
Secondly, the fuel that is not well refined has a lot of multiple carbon molecules. As a result, the carbon molecules are deposited inside the engine, mostly on the valves and spark plug as the fuel/air mixture burns. This would cause a reduction in the amount of fuel/air mixture inside the engine and a subsequent increase in the amount of compression. Such is a potential scenario for engine knock as it favors uneven combustion of fuel/air mixture.
If you use a spark plug that is not recommended for your car, the chances are that your engine would perform below the expected level. Keeping in mind that, with the exclusivity and superiority of Mercedes-Benz, it comes with its unique and high-quality parts. If you use a spark plug that is not recommended for that specific Mercedes-Benz chances are, that it will experience engine knock.
High-Quality Performance of Mercedes-Benz Design to Tolerate and Detect Engine Knock
Mercedes-Benz is unrivaled due to its combination of exclusive engine performance with executive car luxury driving experience. When it comes to high-end performance, Mercedes-Benz is way ahead of the competition. Several antiknock measures have been incorporated in Mercedes-Benz engine.
1. Mercedes-Benz knock sensor
To begin with, the engine is fitted with a knock sensor. In a case you are using low-quality gasoline with low octane ratings than what is prescribed for your specific Mercedes-Benz model, an engine knock can occur. The state-of-the-art Mercedes-Benz knock sensor would detect the abnormality as it happens and immediately back off the fueling.
As a result, the engine will run lean and avert a possible engine knock. Although Mercedes-Benz has a highly effective knock sensor, it should only be viewed as an emergency option and not as a safety valve. This is because the sensor can only detect an abnormality but will not save your Mercedes-Benz engine from serious effects in case it runs into a knock.
2. Compression ratios designed for higher octane gasoline fuel
Because of the high performance that is associated with Mercedes-Benz it subsequently uses high compression engines. This has advantages as well as disadvantages. The advantage is that the engine produces enough power in every engine stroke. On the contrary, the disadvantage is that the higher the level of compression needed, the higher the temperature and pressure, thus enhancing premature spontaneous ignition. In essence, engine knock is a potential hazard in Mercedes-Benz engines.
To lessen the effect of engine knock, high-quality gasoline fuel that can be compressed more without igniting spontaneously is recommended for use. Every Mercedes-Benz engine comes with its model specific compression ratio. Engine compression ratio is a way of comparing the volume of fuel/air mixture right from when a piston is at the bottom of the cylinder to the time it is at the top. The higher the compression ratio, the more the need to compress the fuel to air mixture before it is ignited.
High octane gasoline is recommended for Mercedes-Benz because it can be compressed more without being ignited spontaneously, an imperative feature behind the high engine performance associated with Mercedes-Benz. The fuel has less heptane to octane thus its unique characteristic to stand more compression before being ignited.
Different Mercedes-Benz model comes with different compression ratios. For instance, C-Class AMG Coupe C63 2dr Auto has a compression ratio of 10.5:1. It implies that it needs to use gasoline fuel that is high in octane.
The Bottom Line
Mercedes-Benz engine knocking can be lessened or completely avoided with the use of high-quality gasoline fuel that can withstand high compression. Before fueling your Mercedes-Benz ensure that you are well conversant with its compression ratio so that you can provide the appropriate gasoline.