Heat stress on the spark plug

Abstract eng:
The spark plug with integrated chamber increases the quality of ignition of the homogeneous mixture in the engine cylinder. The discharge of a very small amount of a burning mixture from the chamber (the so-called chamber ignition) leads to a faster development of the initial burning phase, and the subsequent burning of the mixture in the cylinder is then more stable in terms of inter-cycle variability. However, the spark plug housing with the integrated chamber is exposed to a higher thermal load compared to a conventional spark plug, and this must therefore be respected when constructing a spark plug with an integrated chamber. The paper shows the impact of the design of the spark plug with the integrated chamber on the temperature at the bottom of the cellular spark plug housing.

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