Ignition plug

摘要

The plug has a body (1), a central electrode and a body electrode (3) that form a discharge gap for ignition spark between the body and the central electrode. The central electrode and the body electrode exhibit metal reinforcement. The precious metal reinforcement of the body and central electrodes exhibits covering of the precious metal surfaces of 90 percentages. A precious metal piece (5) is positioned in middle of the width of the body electrode.