Eelkäivitus

Eelkäivitus is an Estonian term that translates to "pre-start" or "pre-ignition" in English. It refers to a phenomenon that can occur in internal combustion engines. Specifically, eelkäivitus happens when the fuel-air mixture in an engine cylinder ignites before the spark plug fires. This premature combustion can be caused by several factors, including hot spots within the combustion chamber, such as carbon deposits or a glowing exhaust valve.

When eelkäivitus occurs, the uncontrolled combustion creates an abnormal pressure wave inside the cylinder. This can lead to several undesirable effects. One of the most noticeable is a knocking or pinging sound, often described as "engine knock" or "detonation" in English. This sound is the result of the rapid and uncontrolled release of energy. Prolonged or severe eelkäivitus can cause significant damage to engine components, including pistons, connecting rods, and crankshafts, due to the excessive pressures and stresses involved.

Preventing eelkäivitus typically involves addressing its root causes. This can include ensuring proper engine cooling, using the correct octane fuel for the engine, and maintaining the combustion chambers to prevent excessive carbon buildup. In some cases, adjusting the engine's timing or ignition system can also help mitigate the risk of premature ignition. Understanding and preventing eelkäivitus is crucial for the longevity and efficient operation of internal combustion engines.