Diesel engines for land and marine work . ed by means of ports in the cyhnder. In order toavoid the necessity either of cutting away the piston todeflect the scavenge air towards the top of the cylinder,as in the case of the Polar Diesel engine, or utiUzing anauxihary scavenging valve, as is done by Messrs. Sulzer,the scavenge ports are themselves shaped vdth the idea ofcausing the air to clear the whole of the cylinder effectively. These ports occupy rather more than half of the circum-feren:e of the cylinder, leaving therefore less than one-halffor the exhaust ports. There are two sets, one
Diesel engines for land and marine work . ed by means of ports in the cyhnder. In order toavoid the necessity either of cutting away the piston todeflect the scavenge air towards the top of the cylinder,as in the case of the Polar Diesel engine, or utiUzing anauxihary scavenging valve, as is done by Messrs. Sulzer,the scavenge ports are themselves shaped vdth the idea ofcausing the air to clear the whole of the cylinder effectively. These ports occupy rather more than half of the circum-feren:e of the cylinder, leaving therefore less than one-halffor the exhaust ports. There are two sets, one pair beingarranged tangentially, so that the air entering them sweepsround the walls and rises to the top of the cyhnder, whilstthe other pair cause the air to rise right to the centre. Bythis method there is probably an economy in the quantityof air necessary to give complete scavenging. In the cover of each cylinder there are two valves—thefuel inlet valve and the starting air valve. The motor CONSTRUCTION OF DIESEL MARINE ENGINE 231.
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