Prelude L4-2056cc DOHC (1990)
Spark Plug: Description and Operation
Spark Plug Construction
The spark plug provides a path for the high current of the secondary circuit to flow to ground. The only paths for this current are through the ground
electrode and center electrode across the spark gap. The spark produced when the current jumps the gap and ignites the air/fuel mixture in the cylinder.
The temperature of the spark plug is determined by the length of the insulator and the size of the heatsink area. The longer the insulator is, the smaller
the heatsink area will be and this will cause the spark plug to be hotter. The center electrode temperature ranges from a low of 392°F (200°C) at 10
m.p.h. to a high of 1472°F (800°C) at 80 m.p.h.
