Abstract: An internal combustion engine with charge stratification and spark ignition comprises a cylinder head having a main combustion chamber and a cavity defined by surrounding walls of the cylinder head and opening toward the main combustion chamber. An auxiliary combustion chamber is formed within a cup-shaped insert frictionally maintained in the cavity and opening away from the main combustion chamber. The cup-shaped insert is thin-walled and has an opening providing a passage connecting the main combustion chamber and the auxiliary combustion chamber and a pair of openings for receiving a fuel delivery device and an ignition device, respectively.

Abstract: An auxiliary combustion chamber for a stratified chage internal combustion engine is formed by an insert secured in a bore of the cylinder head. The insert is in the form of a tubular shell having openings for ignition means, fuel supply means, and having a passage communicating with the main combustion chamber. The tubular shell has a relatively massive construction in the region of the passage and is relatively thin walled in the remaining regions to provide the capability for fast warm-up of the auxiliary combustion chamber and to prevent overheating of the chamber in the region of the passage.

Abstract: An internal combustion engine with charge stratification and spark ignition comprises a main combustion chamber and an auxiliary combustion chamber, the main combustion chamber and the auxiliary combustion chamber being interconnected by a short passage. The auxiliary combustion chamber has a wall, at least a portion of which is contiguous with an exhaust conduit of the main combustion chamber. When hot exhaust gases from the main combustion chamber are flowing through the exhaust conduit, the portion of the wall of the auxiliary combustion chamber contiguous with the exhaust conduit is in direct heat exchange contact with the hot exhaust gases for rapidly heating the auxiliary combustion chamber to a temperature within an optimum range to prevent condensation from forming therein.

Abstract: An internal combustion engine with charge stratification and spark ignition comprises a main combustion chamber and an auxiliary combustion chamber, the main combustion chamber and the auxiliary combustion chamber being interconnected by a short passage. Hot gases flow past an outer surface of the auxiliary combustion chamber in heat exchange contact therewith for rapidly heating the auxiliary combustion chamber to a temperature within an optimum range to prevent condensation from forming in the auxiliary combustion chamber.