A gasoline engine which also has a multifuel capability has its combustion initiated by spark in a small cylinder 12 closed at one end by a piston 9 actuated by a camshaft or eccentric to close its volume after ignition and to open on the induction stroke of the main piston 2. This cylinder 12 lies to one side of the main cylinder 7 and communicates with it via a small passage or combustion window 21. Above the cylinder 12 is located the spark plug and a small inlet valve 18 or a fuel injection nozzle 23, Fig. 1A, whilst above the main cylinder 7 are located the inlet and exhaust valves. The shaft driving the piston 9 of the small cylinder 12 is driven at half crankshaft speed. IMAGE
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