PLASMA-JET IGNITION PLUG

摘要

To provide a plasma jet spark plug capable of preventing a channeling progress and having excellent heat conduction. The plasma jet spark plug is comprised of: a ceramic insulator 10 having a small diameter portion 15 which assumes a linear shape in an axis O direction, and a center electrode 20 has an outer diameter increasing in the order of a frontmost portion 23, a step portion 24, a front end portion 22 and a body portion 21.