F02B 19/1061

Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder {with only one pre-combustion chamber pre-combustion chamber and cylinder being fed with fuel-air mixture(s) pre-combustion chamber and cylinder having both intake ports or valves, e.g. HONDS CVCC with residual gas chamber, e.g. containing spark plug}