Apparatus and method for improving engine performance

A combination spark plug adapter and compression release device particularly for use in an internal combustion engine and allowing utilization of a high-performance spark plug to improve combustion, engine smoothness and fuel economy, as well as power output, and also providing for temporary compression release to facilitate easier starting of the engine;

• the internal combustion engine having a spark plug port including a threaded section opening to a combustion chamber of the engine, the spark plug port including a step adjacent to and outwardly of the threaded section and providing a sealing surface, and the spark plug port being configured to receive a conventional spark plug which in sequence along its length provides:
• an electrode section providing a spark gap in the combustion chamber of the engine, a metallic portion with a threaded portion for threadably engaging the threaded section of the spark plug port and leading from the electrode section first to a sealing shoulder engageable with the sealing surface, and an external metallic body section which provides wrenching flats, and which carries an insulator section with a metallic electrical contact;
• said device comprising:
• a body portion externally replicating the configuration of said conventional spark plug including said threaded section, said sealing shoulder, and said external body section with wrenching flats;
• said body portion internally defining a stepped through bore providing a substantially straight non-threaded bore portion within said threaded section, and said through bore opening at one end of said body portion to a combustion chamber of said engine, said bore portion extending internally of said body to an outwardly disposed and tapering seat section;
• a radially outwardly extending recess above said tapering seat section, and including a non-threaded section extending to a threaded section of said stepped through bore, and said threaded section opening on said body portion;
• whereby, said device is configured to receive a high-performance spark plug which in sequence along its length provides:
• an electrode section providing a spark gap, and an adjacent elongate metallic non-threaded cylindrical section, which leads to a tapering sealing shoulder, which is defined adjacent to a metallic threaded section, and leads to an external metallic body section, the external metallic body section providing plural wrenching flats, and carrying an insulator section with a metallic electrical contact;
• and wherein said substantially straight non-threaded bore portion within said threaded section is sized to provide a radial gap circumscribing said elongate metallic non-threaded cylindrical section of said spark plug, said radial gap extends from adjacent to said electrode section and spark gap within a combustion chamber of the engine to said tapering sealing shoulder, a recess defined by said body portion communicating across said tapering seat section and to an annular chamber defined within said radially outwardly extending recess above said tapering seat section, a bore communicating outwardly from said annular chamber, and said body portion carrying a pressure-responsive compression release valve communicating with said bore;
• whereby, said compression release valve in a starting condition provides limited communication of pressurized gas from said combustion chamber along said radial gap, along said recess, to said annular chamber, and along said bore to said compression release valve and to ambient;
• in a second condition said compression release valve closing said communication.

A method of adapting a high-performance spark plug to an internal combustion engine not configured to receive the high-performance spark plug in order to improve combustion, engine smoothness, fuel economy, as well as power output for the engine;

• the internal combustion engine having a spark plug port including a threaded section opening to a combustion chamber of the engine, the spark plug port including a step adjacent to and outwardly of the threaded section and providing a sealing surface, and the spark plug port being configured to receive a conventional spark plug which in sequence along its length provides:
• an electrode section providing a spark gap in the combustion chamber of the engine, a metallic portion with a threaded portion for threadably engaging the threaded section of the spark plug port and leading from the electrode section first to a sealing shoulder engageable with the sealing surface, and an external metallic body section which provides wrenching flats, and which carries an insulator section with a metallic electrical contact;
• the high performance spark plug contrasting to the conventional spark plug in providing in sequence along its length provides:
• an electrode section providing a spark gap, and an adjacent elongate metallic non-threaded cylindrical section, which leads to a tapering sealing shoulder, which is defined adjacent to a metallic threaded section, and leads to an external metallic body section, the external metallic body section providing plural wrenching flats, and carrying an insulator section with a metallic electrical contact;
• said method comprising steps of:
• providing an adapter with a body portion externally replicating the configuration of said conventional spark plug including said threaded section, said sealing shoulder, and said external body section with wrenching flats;
• configuring said body portion internally to define a stepped through bore providing a substantially straight non-threaded bore portion within said threaded section, and said through bore opening at one end of said body portion to a combustion chamber of said engine, said bore portion extending internally of said body to an outwardly disposed and tapering seat section;
• providing a radially outwardly extending recess above said tapering seat section, and including a non-threaded section extending to a threaded section of said stepped through bore, and said threaded section opening on said body portion;
• whereby, said adapter is configured to receive the high-performance spark plug.

A method of providing both improved performance and improved ease of starting of an internal combustion engine by adapting a high performance spark plug to the engine, and by providing a pressure-responsive compression relief valve all without disassembly or modification of the engine, said method including steps of;

• employing an internal combustion engine having a spark plug port including a threaded section opening to a combustion chamber of the engine, the spark plug port including a step adjacent to and outwardly of the threaded section and providing a sealing surface, and the spark plug port being configured to receive a conventional spark plug which in sequence along its length provides:
• an electrode section providing a spark gap in the combustion chamber of the engine, a metallic portion with a threaded portion for threadably engaging the threaded section of the spark plug port and leading from the electrode section first to a sealing shoulder engageable with the sealing surface, and an external metallic body section which provides wrenching flats, and which carries an insulator section with a metallic electrical contact;
• employing a high performance spark plug which is not compatible with the spark plug port, and includes in sequence along its length:
• an electrode section providing a spark gap, and an adjacent elongate metallic non-threaded cylindrical section, which leads to a tapering sealing shoulder, which is defined adjacent to a metallic threaded section, and leads to an external metallic body section, the external metallic body section providing plural wrenching flats, and carrying an insulator section with a metallic electrical contact;
• providing a body portion externally replicating the configuration of said conventional spark plug including said threaded section, said sealing shoulder, and said external body section with wrenching flats;
• configuring said body portion internally to define a stepped through bore providing a substantially straight non-threaded bore portion within said threaded section, and said through bore opening at one end of said body portion to a combustion chamber of said engine, said bore portion extending internally of said body to an outwardly disposed and tapering seat section;
• providing a radially outwardly extending recess above said tapering seat section, and including a non-threaded section extending to a threaded section of said stepped through bore, and said threaded section opening on said body portion;
• configuring said substantially straight non-threaded bore portion within said threaded section to provide a radial gap circumscribing said elongate metallic non-threaded cylindrical section of said high performance spark plug, said radial gap extends from adjacent to said electrode section and spark gap within a combustion chamber of the engine to said tapering sealing shoulder;
• forming a recess defined by said body portion communicating across said tapering seat section and to an annular chamber defined within said radially outwardly extending recess above said tapering seat section;
• providing a bore communicating outwardly from said annular chamber, and
• on said body portion carrying a pressure-responsive compression release valve communicating with said bore;
• whereby, said compression release valve in a starting condition provides limited communication of pressurized gas from said combustion chamber along said radial gap, along said recess, to said annular chamber, and along said bore to said compression release valve and to ambient;
• in a second condition said compression release valve closing said communication.