Air-cooled injection internal combustion engine with turbulence chamber

Claim 1

An air-cooled fuel injection internal combustion engine comprising a cylinder and a cylinder head with a turbulence chamber with a longitudinal axis and an inner mantle surface, the turbulence chamber having a length slightly greater than its maximum diameter of revolution and having a fuel injection passage tangential thereto for injecting fuel approximately parallel to the longitudinal axis of said turbulence chamber into the periphery thereof, which includes in combination therewith a heat insulated insert member having a passageway therethrough and forming a portion of that inner surface of said turbulence chamber which is located outside that range of surface which is to be impacted upon by the fuel during the fuel injection period, that inner mantle surface portion of said turbulence chamber which is formed by said insert member only being less than a quarter of the total inner mantle surface of said turbulence chamber, and said insert member having a medium height equaling from one quarter to one-third of said diameter of revolution and having a medium diameter equaling from two-thirds to one total of said maximum diameter of revolution.