(under the class definition) Engines wherein air is forced through the crankcase by some manner other than the mere pumping effect of the engine pistons for ventilating or removing fumes from the crankcase.
(1) Note. Air may be forced through the crankcase by the forward motion of the vehicle or by the fan due to the formation of a venture or aspirating nozzle on the crankcase.
SEE OR SEARCH THIS CLASS, SUBCLASS:
41.31+, for crankcase cooling or oil cooling by confined coolants and for crankcase ventilation combined with cylinder, piston or valve cooling.
SEE OR SEARCH CLASS
92, Expansible Chamber Devices,
78+, for a means to purify a fluid to or from a portion of an expansible chamber device, subclass 80 for a force exerting means to move fluid from a nonworking chamber of an expansible chamber device, and subclass 82 for a means to control the flow of fluid from a nonworking chamber of an expansible chamber device.
