F02B 19/1066

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 having an inlet and an outlet port and with two distinct intake conduits or with one intake conduit in which the heavier fuel particles are separated from the main stream, e.g. by gravitational forces}