Development of Small Spark Plug (M8 × 1)
891760
09/01/1989
- Event
- Content
- The latest engine development trends have blended the consumers demands for high performance and horsepower output with Governmental regulations for fuel efficiency and emission reductions. As a result of this, it has become increasingly common to use a four valve per cylinder design. One application in particular is a four-stroke cycle engine for motorcycles. In order to incorporate all of these elements into one design, space constraints being considered, spark plugs of a reduced size were developed. To this end, compact spark plugs attain the following advantages over the conventionally sized plugs:
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1)
Improved volumetric efficiency due to an increase in valve diameters and a reduction in valve arrangement angles.
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2)
Improved rigidity of the material in the area between the threaded plug hole and the valve seat.
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1)
- Pages
- 10
- Citation
- Kagawa, J., and Kato, H., "Development of Small Spark Plug (M8 × 1)," SAE Technical Paper 891760, 1989, https://doi.org/10.4271/891760.