Abstract: An internal combustion engine with a block cylinder head 7 and a fluid-cooled cylinder liner 1 has a cooling chamber between the cylinder liner 1 and the crankcase 2. The cooling chamber includes at least two partial cooling chambers 9a, 9b which are connected only by a connecting channel 8, and wherein the first partial cooling chamber 9a, which is adjacent to the cylinder head 7, is open in the direction of cylinder head 7 and passes over into a slot-shaped annular chamber 10 in cylinder head 7. A cooling arrangement for a cylinder liner for use with block cylinder heads is provided in which the cooling adjusts itself according to the quantities of heat which need to be removed, i.e., the thermal load is more uniformly carried over the entire axial length of the cylinder liners.

Abstract: An air-cooled, reciprocating piston, internal combustion engine has at least two adjacent cylinder barrels with a plurality of cooling ribs lying substantially perpendicular to the longitudinal axes of the barrels on at least part of the periphery thereof. The intake ports of the cylinder heads are located on the cooling air inlet side while the exhaust ports are located on the cooling air outlet side, and an air deflection cover overlies the cylinder barrels on the cooling air outlet side. The cylinder barrels are provided on the cooling air outlet side with cooling ribs lying substantially parallel to the longitudinal axes of the cylinder barrels. The air deflecting cover is of a configuration such that at least some of the cooling air flowing, in the area adjoining the crankcase, around and between adjacent cylinder barrels, is deflected toward these parallel lying ribs, so that essentially the total flow of cooling air supplied may be used to cool the hottest area of a cylinder barrels.