Learn about the main causes of the crackling sound when pressing gasoline

The phenomenon of roofing or slapping is one of the unhealthy phenomena that occur in a car engine, if it occurs inside the engine combustion chambers, it is here called a back wave due to the occurrence of combustion inside the engine room that starts from any point except the spark plug and because of a pressure wave corresponding to the natural combustion wave coming from the spark plug For example, when the waves clash with a group of rocks in a row, it is noticed that a sound similar to the sound issued when you move the gearbox at a speed lower than the usual speed, and today we know the reasons for the rumble of the car.

The phenomenon of car cracking, although most car owners do not feel upset about it, but with its continued occurrence, it leads to a reduction in the life of the engine, and therefore it is recommended to move as soon as you hear the sound of roofing in the car.

Reasons for roofing or car karkarah:-

• . Carbon buildup on the piston, as well as engine design, fuel type.
  . The presence of fuel impurities and driving method, in addition to the vehicle load and temperature.
  . The condition of the oil and cooling system in the car, as well as the life of the engine.
• 
• Engine design: One of the numbers that we see on the engine is the compression ratio, which means the ratio of the volume of the air-fuel mixture inside the piston, usually from 1:8 to 1:10.
• The type of fuel: the higher the gasoline number, this indicates that it keeps the engine from the phenomenon of roofing, so if the engine has a compression higher than “9”, it is not recommended to use 80 fuel and it is preferable to be either 90 or 92.
• Fuel impurities: The presence of water in the fuel causes roofing in the car. If frost recurs, especially after refueling the car, this station must be changed.
• Driving method: moving to high speed early, must always take into account the appropriate shift in speed, and delay the transfer at the start or when the vehicle is loaded with heavy loads.
• Car load: the greater the weight load of the car, the greater the car’s ability to have the phenomenon of roofing.
• Engine temperature: The higher the air temperature, the higher the engine temperature, and the car is exposed to the phenomenon of roofing.
• Ignition angle: or as it is called, is the time difference between the moment of ignition of the spark plug and the end of the engine’s compression stroke.
• Oil condition: If the oil loses a degree of its viscosity, this leads to an increase in the engine temperature, which in turn leads to the appearance of the crankshaft phenomenon.
• Cooling cycle problems: It causes the engine to overheat and exposes the car to roofing.
• Older engines are more prone to roofing compared to modern cars. It is also due to the presence of a bush in the crankshaft gear on which the crankshaft is installed, which in turn leads to a sparking time incompatible with the highest compression of the fuel
•  By using spark plugs that are not suitable for the engine or adjusting the spark plug gap less than the required value, due to the use of poorly insulated wires or motors, the presence of damaged injectors may also lead to slapping