MX-6 L4-1991cc 2.0L DOHC (1993)
Spark Plug: Description and Operation
PURPOSE
Spark plugs protrude into the combustion chambers. When the ignition coil discharges, a high voltage spark jumps across the air gap between
center and ground electrodes, igniting the compressed air/fuel mixture.
Typical Spark Plug Construction
CONSTRUCTION
There are different types of spark plugs for different applications. Each type has specific advantages for its applications. Features include, but are
not limited to:
Thread Size
The diameter and pitch of the threaded portion of the spark plug varies with different applications.
Reach
The length of the threaded portion and how far the electrode protrudes into the combustion chamber varies with different applications.
Spark Plug Heat Range Illustrated
Heat Range
The ability of the spark plug to cool its center electrode.
Hot plugs have longer insulators around the center electrode and less cross-sectional area for heat to transfer from the electrode to the cylinder
head. Heat is conducted away from the center electrode more slowly and the electrode tip stays at a higher operating temperature.