What are the features of special-type spark plugs?
There are several kinds of special type spark plugs including: the wide-gap spark plug, the projected metal shell spark plug, the Iridium IX spark plug, the long-reach spark plug, the half-thread spark plug and the compact-type spark plug for industrial engines. Each has its own special characteristics.
The spark gap dimension is increased by 1.1. to 1.5 mm to reduce the quenching action of the electrode and improve ignitability.
(Note) That the wide-gap spark plug cannot be used unless there is a source of sufficient electrical capacity.
Compact spark plug for power equipment
This is a compact and lightweight spark plug for use in small-engine equipment, such as chain saws, lawn mowers and generators.
Long-Reach plug
Extending the length of spark plug thread helps to improve the cooling efficiency of the cylinder head. There is a possibility that there will be an increase in the number of engines using long-reach spark plugs in the future.
Iridium spark plug
Iridium is used at the tip of the center electrode. This allows the electrode to be thinner than the platinum type, improving ignitability. In addition, the taper-cut design of the tip of the ground electrode makes this a high-performance spark plug that improves ignitability and acceleration.