.~.~.~.~ Lengthwise scavenging of cylinders from head
Unofficial Alpha Subclasses: R A AA AV AB AC AD AE AF BA CA CB CC DA FA S SC PP SP
DEFINITION
Classification: 123/73
Two-cycle recompression internal-combustion engines having a cylinder closed at one end and an air-tight casing inclosing the connecting-rod and crank and forming a closed crank-case in open communication with the other end of the cylinder and a piston reciprocating in the said cylinder, such piston performing at the same time the functions of both a working piston and a piston for the pump which supplies a fresh charge to the engine, one end of the cylinder and the corresponding end of the piston constituting the working cylinder and piston, while the other or rear end of the piston and the corresponding end of the cylinder, together with a closed crank-case form a pump for introducing a new charge into the working end of the cylinder. In engines in this subclass the supply or exhaust ports, or both, are generally formed in the cylinder-wall and are then controlled by the piston as it reciprocates, the piston forming a closure for such ports when it is required that they be kept closed.
