Eaton Char-Lynn Motor – Motor Knock: 6 Reasons

       Eaton Char-lynn Motor     describes six reasons for motor knock

　　1 ignition angle is too advanced

　　In order for the piston to gain power immediately upon entering the power stroke after the end of the compression stroke, it is usually pre-ignited before the piston reaches top dead center (because it takes a while from ignition to complete combustion). Too early ignition will cause most of the oil and gas to be burned when the piston is still in the compression stroke. At this time, the unburned oil and gas will undergo extreme pressure and spontaneous combustion, causing knocking.

　　2 motor combustion chamber excessive carbon deposition

　　Excessive carbon deposits in the motor’s combustion chamber, in addition to increasing the compression ratio (generating high pressure), can also generate high temperature hot spots or sparks on the carbon deposit surface, causing the motor to knock.

　　3 motor temperature is too high

　　If the motor is too hot, the intake air temperature is too high, or the motor cooling water circulation is poor, which will cause the motor to be hot and knock.

　　4 Air-fuel ratio is incorrect

　　Too thin a mixture of fuel and air will increase the combustion temperature, and an increase in the combustion temperature will cause the motor temperature to rise. If the air-fuel ratio is incorrect, it is easy to knock.

　　5 fuel octane number is too low

　　Octane number is an indicator of fuel knock resistance. The higher the octane number, the stronger the knock resistance. For motors with a high compression ratio, the pressure in the combustion chamber is high. If fuel with low knock resistance is used, knocking is likely to occur.

　　6 fuel cleanliness is not enough

　　Some of the physical and chemical impurities contained in the fuel, including some aromatic substances, can also cause spontaneous combustion during motor compression, which can cause knocking.

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