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There are many factors that affect the operation of vehicle engines. Not working regularly of an engine causes a decrease in the performance; on the other hand, an increase in the fuel consumption, the vibration and the HC emission. These adverse impacts reduce vehicle comfort and increase travel costs, and also damage nature much more. Vehicles are normally designed in such a way that they provide optimum operating parameters. However, as the vehicle is used, these parameters negatively change. In this study, it has been investigated that the effects of spark plug gap on vibration, noise and HC emission in a gasoline engine. It is a fact that, the spark plug is abraded in a certain amount because it is continuously ignited. This abrasion increases the distance between the center electrode and the electrode head, and changes the quality of the composed spark. In experiments, it has been detected that, when the spark plug clearance and the number of revolutions are increased, the vibration and noise increase proportionally; on the other hand, the exhaust emission (HC) value increases at 0,7 mm, 0,8 mm and 1,0 mm plug gap and decreases at 0,9 mm plug gap. As a result, setting the standard spark plug gap in the gasoline engines to 0,9 mm instead of 0,7 mm can provide a significant reduction in exhaust emissions; thus, an improvement in performance can be achieved.

Investigation of effects of spark plug gap on vibration, noise and HC emission in a gasoline engine