Patent ID: 8890398

Claim:
A Spark plug for gasoline engines comprising: an elongated hollow body made of metal, said body having a forward end with an undercut formed by an interior annular shoulder of the body and a rear end; an elongated ceramic insulator which is mounted in the body and has a rear end that projects beyond the rear end of the body and has a forward end beyond which the forward end of the body projects; a center electrode which is inserted into the insulator, projects beyond the forward end of the insulator and the forward end of the body, and is connected to a metal connection pin in an electrically conductive manner; and at least one ground electrode which starts from the forward end of the body and is approached to the center electrode to an electrode distance between the at least one ground electrode and the center electrode to form a spark gap; characterized in that the distance of the center electrode from the annular shoulder is greater than or equal to the 1.2-fold electrode distance; that the distance of the exposed forward end of the insulator from the metal body is greater than or equal to the 1.2-fold electrode distance; that the distance of the forward end of the insulator from a front side of the annular shoulder is no more than 2 mm plus the 1.2-fold electrode distance; and that the distance of the exposed forward end of the insulator from the metal body is greater than or equal to the 1.2-fold electrode distance.