BoschAutoParts.com_SparkPlugHeatRange.pdf
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Spark Plug
Heat Range
Temperature curves of spark plugs with different heat-range code
numbers at full load in the same engine.
j
Spark plug with high heat-range
code number (“hot plug”). Large
insulator nose area absorbs much
heat, low heat dissipation.
k
Spark plug with medium
heat-range code number. Insulator
nose area smaller than in “hot
plug”. Lower heat absorption,
better heat dissipation.
l
Spark plug with low heat-
range code number (“cold plug”).
Smaller insulator nose area
absorbs little heat. Very good heat
dissipation through short thermal
conduction path.
—————— Heat-absorbing surface
- - - - - - Thermal conduction path
Plik z chomika:
abel121
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