Effect of iridium spark plug gap on emission, noise, vibration of an internal combustion engine

Abstract

The most important factors affecting comfort and performance in motor vehicles are; The exhaust gases generated by the internal combustion engine are noise and vibration. The effect of these factors can be reduced thanks to the fully efficient and regular operation of the engine. The most important part affecting the efficient operation of the spark plug ignition engine is the spark plug. Spark plug failure; emission, noise and vibration values increase. These negative effects reduce vehicle comfort and increase travel costs; it also causes more damage to nature. Vehicles are designed and manufactured to ensure optimum operating parameters during production. However, changes in these parameters occur as the vehicle is used and different types of parts are used during maintenance. In this study, spark plug nail spacing; Emission, noise and vibration effects and determination of optimum nail spacing. In the experiments, iridium spark plug was used as ignition spark type. The spark plugs wear out because the engine fires continuously during operation. This wear increases the distance between the center electrode and the electrode cap and changes the resulting spark quality. According to the experiments; When the iridium spark plug nail spacing is 0.8 mm, the noise is optimum at different revolutions, the vibrations in the 0.9 mm nail spacing increase at low revolutions, and the hydrocarbon value is minimized at high revolutions in the 0.8 mm spark plug nail spacing.

Effect of single-contact spark plug electrode gap on composition of engine exhaust emissions

“…If the gap increases more than the manufacturer recommended, the opposite effect can be observed and HC emissions increase. Similar findings were observed also in another research [7], where the original plug gap demonstrated lower HC emissions, while a wider gap increased HC values.…”

“…Best the results were obtained for platinum spark plug with a 1 mm spark plug gap and hydrogen blended gasoline combination. Another study [7] showed that the speed together with the iridium spark plug gap increase from 0.8 mm to 0.9 mm results in increase of vibration and noise, as also in hydrocarbon emissions. At the same time, Dave [8] concluded that in case of compressed natural gas (CNG) fuelled vehicles, which are retrofitted conversions from existing SI engines, modification of the spark plug gap is necessary to optimize the ignition system for better performance.…”

Experimental investigation of combustion, performance and emission characteristics of a diesel engine fuelled with diesel–biodiesel–alcohol blends

“…Diesel engines are widely used for high combustion efficiency, adaptability, reliability and cost efficiency, and so they are one of the major contributors to harmful exhaust emissions [7]. Particularly with increasing environmental awareness and concerns, the studies focusing on reducing the harmful exhaust emissions have been intriguing.…”

Otomobil Çamurluklarında Kullanılan Çamurluk Davlumbazının Farklı Parametrelerde Araç İç Gürültüsüne Etkisi

“…Bu sayede, kaynağın oluşturduğu gürültü dış çevreden izole edilmiş olur. Bu yöntemde aşağıdaki uygulamalar yapılabilir [20]; a) Zamanında yapılan bakımlarla, b) Sessiz işlemlerin tercihiyle, c) Gürültü kaynağının yerinin değiştirilmesiyle, d) Gürültü kaynağında susturucu kullanılmasıyla, e) Gürültüye sebep olan titreşimin yalıtımıyla veya sönümlenmesiyle, f) Gürültü kaynağının örtülmesiyle gürültünün azaltılması sağlanabilir.…”

“…Bu sayede, kaynağın oluşturduğu gürültü dış çevreden izole edilmiş olur. Bu yöntemde aşağıdaki uygulamalar yapılabilir [20]…”