Pre-ignition and knock in gas engines can lead to the destruction of the piston crown, valves, and spark plug electrodes. These two phenomena are accompanied by instantaneous pressure waves and extremely high temperatures, which can cause serious damage to the engine in a short period. In this context, the role of gas engine oil in managing or exacerbating these conditions is often overlooked, while the ash and deposits resulting from oil combustion are one of the main triggers for creating hot spots in the combustion chamber.
Pre-Ignition and Knock; Consequences of Combustion Disruption
In gas engines, the combustion cycle must occur with precise timing and simultaneously with the vibration of the spark plug electrode. However, if the flame front advances unevenly or the fuel burns at an unusual time, the engine faces two destructive and mechanical phenomena: "pre-ignition" and "knock." These disruptions are accompanied by instantaneous pressure waves, thermal shocks, and a drop in efficiency, and if not monitored in time, they may cause irreparable damage to vital engine components.
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These two phenomena can chain-reactively exacerbate each other, leading to structural mechanical damage. Therefore, attention to the quality of engine oil and combustion conditions is of special importance.
The Role of Engine Oil in Deposit Formation and Temperature Control
The combustion products of engine oil gradually create layers of composite deposits (mineral ash and compressed carbon) on the internal surfaces of the chamber, such as the piston crown, valves, and edges of the spark plug electrode. These deposits act as thermal insulation and trap the heat generated in the combustion cycle. As the thickness of these deposits increases, their local temperature also rises, which can lead to pre-ignition.
Engine oil in gas engines always has a controlled leak into the combustion chamber. The non-combustible part of this oil, or the ash from additives, deposits on the surfaces after combustion. Therefore, choosing gas engine oil is more than just a simple choice; attention must be paid to its thermal and chemical properties.
To prevent problems caused by deposit formation and pre-ignition, periodic monitoring of parameters such as increased oxidation, nitration, and changes in viscosity is of high importance. The technical team can make necessary corrective interventions in a timely manner by reviewing this data.
Selecting the right oil is considered the most important tool in controlling the deposit-forming factor. Oil that is not resistant to the high temperatures of the combustion chamber will quickly undergo carbonization and leave hard residues on various engine surfaces.
Ultimately, to maintain the health and better performance of gas engines, selecting a lubricant with a standard ash level and monitoring consumption and periodic inspections should be considered a key approach.
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