Abstract: An improvement in a thermally insulating component for an engine part, made by sintering from ceramic materials, comprises, the thermally insulating component having a composition, consisting of a mixture of zirconium oxide in the range of about 5% to about 25% by volume and mullite in the range of about 75% to about 95% by volume. Further, the mixture of zirconium oxide and mullite is obtained by chemically mixing the zirconium oxide and mullite in their molecular states, rather than mechanically mixing them. Another feature of this invention includes, forming said thermally insulating component by slip casting and pressureless sintering the mixture of zirconium oxide and mullite at a temperature no greater than 1700.degree. C. This improvement in a thermally insulating component for an engine part, made from a mullite-zirconia ceramic composite, embodying the present invention, is particularly useful in making flame decks for cylinder heads, and insulating coverings for pistons and exhaust ports.

Abstract: A high tension cable device according to the present invention for use with an ignition system having a discharge tube for forming a series gap therein in an automobile engine or the like can eliminate a so-called creeping discharge which is likely to occur along the external peripheral surface of the discharge tube, and the above cable device comprises; a cylindrical casing having a connecting terminal therein in a firmly engaged formed at one end thereof, which connecting terminal being engageable with a terminal of an ignition plug of an engine side; an auxiliary functional section composed of one or a plurality of auxiliary functional parts such as the discharge tube which are fixedly inserted into said cylindrical casing, wherein the front end of the auxiliary section is connected to the rear end of the connecting terminal, and the rear end thereof is connected to a terminal of a high tension cable side, characterized in that the cylindrical casing is formed by an electrically insulating rigid material a

Abstract: An ignition lead arrangement comprising individual ignition leads which are constructed as flat cables which are integrated to a single molding for connection to an ignition distributor. The arrangement also comprises the necessary sockets for connection to the spark plugs and ignition coil which are covered with the insulating rubber which also forms the insulating material for the individual ignition leads.

Abstract: The present invention relates to a stratified combustion type engine comprising an engine cylinder, a main combustion chamber located above the cylinder, an injection nozzle for injecting auxiliary fuel towards the combustion chamber, and an open pre-combustion chamber provided within the combustion chamber for locally holding and vaporizing the flow of auxiliary fuel from the injection nozzle. The pre-combustion chamber is internally equipped with a spark plug.