SPARK PLUG AND ENGINE EQUIPPED THEREWITH

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PROBLEM TO BE SOLVED : To improve combustion efficiency effectively by completely burning an air-fuel mixture before the activity of the air-fuel mixture supplied to an engine declines. SOLUTION : A spark plug 1 for giving off sparks in the air-fuel mixture in the combustion chamber 11 of the engine comprises a center electrode 2 enclosed by an insulating member 3 almost lower half of which is fixed to a housing case 4, and an annular space 5 is formed between the lower end inner circumference of the housing 4f and the lower end outer circumference of the insulating member 3b. These spark plugs are obtained by bonding powder of natural ore which comprises rare earth metals containing thorium as main components to the lower end outer circumference of the insulating member, or by adding the powder into the materials of an insulator of the insulating member and burning. The plug is put in a cylinder head 10 in the engine so that it faces the combustion chamber 11. COPYRIGHT : (C)2006, JPO&NCIPI