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 of the type operated with charge stratification is disclosed. The engine comprises a main combustion chamber and an auxiliary combustion chamber (prechamber), the main chamber and prechamber being interconnected by a short passage. The engine is supplied with fuel from a closed fuel system having a filter for adsorption of gaseous fuel components. An auxiliary intake line connects the prechamber with the adsorption filter such that the filter operates in the desorption direction as gases are drawn into the prechamber from the filter.

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.