Sparking-plug

A sparking-plug for a combustion chamber of an internal combustion engine having a controlled ignition, and where a flame front develops in the combustion chamber, said sparking-plug comprising a barrel, a center electrode, an earth electrode, an insulator for the center electrode, said insulator having a nose, means for removing heat from said earth electrode, from the center electrode and from the end of said nose of said insulator, said end being disposed relative to said barrel to project into said combustion chamber wherein said end will be partly exposed to the flame front and will be partly masked off from said flame front by said means for removing the heat, said means for removing the heat inclduing earth electrode heat removal means for projecting into said chamber and only partially surrounding said center electrode, said heat removal means comprising an extension of said barrel, said extension constituting a relatively massive support for said earth electrode and being formed integrally with said barrel in the manufacture of said barrel, said support extending axially from an edge of said barrel at least to the outer end of said center electrode and partly surrounding said center electrode on an arc which subtends an angle of substantially between 60.degree. and 120.degree. at the center of the sparking-plug and with the earth electrode extending radially and rectilinearly from the end of said support.