DENSO IRIDIUM POWER IK16 SPARK PLUG (MarkⅡ, X-Corolla, IST, Sprinter)

To increase instability, the important point is to let the flame kernel caused by the spark grow to a large size. Normally, this can be accomplished by widening the spark gap, however, this causes spark voltage to increase, which has the opposite effect. IRIDIUM POWER uses DENSO's very own U-Groove ground electrode to realize the superb instability while maintaining the spark voltage at low levels.