Page 118 - ngk-sytytys-hehkutulpat
P. 118
CHOOSING A RACING SPARK PLUG / MAINTENANCE
Choosing a Heat range
Heat range of spark plugs
Hot type and Cold type
Hot Type (Low heat rating) Cold Type (High heat rating)
Flow of heat
Length of insulator nose Long Short
Small
Heat receiving area of the ring end Large Does not rise easily
Does not overheat easily
Spark plug temperature Rises easily Easily leads to carbon fouling
Characteristics of Merits Does not easily lead to carbon fouling
spark plug Demerits Overheats easily
It is essential to use a spark plug with a heat rating that matches a specific engine and its condition of use.
When the heat rating is too low, When the heat rating is too high,
Choosing a firing end design
About firing end designs
114
