(under subclass 41.72) Cooling structures in which the jacket or cylinder walls are constructed with channels or in such a way as to form channels, or baffles, fins, ribs or grooves are provided inside the coolant chamber, either to guide the coolant in particular paths or directions, or to increase the area of the wall exposed to the coolant.
SEE OR SEARCH THIS CLASS, SUBCLASS:
41.67+, for air cooled cylinders having cooling passages or baffles.