What happens at idling when an IRIDIUM POWER is used?
Owing to stable combustion, less variation in the idling revolutions is produced, hence there is less need for 'engine-breathing' during idling.
When an engine is idling, firing can become particularly bad. Because the IRIDIUM POWER has a low required voltage and high ignitability, sparking continues to work properly during idling. This stabilizes the idling revolution count and quietens the engine.
The following graph gives some examples of idling revolution counts.
Engine: 1600cc 4-valve, 4-cylinder
(The above is analyzed in DENSO.)
Whereas normal plugs have highly variable revolution counts, the IRIDIUM POWER maintains very smooth idling.
Also, because combustion is good, the explosive energy raises the revolution count.