Abstract: A cooling system of an internal combustion engine wherein a water pump (1), a thermostat (2), a water pump exit port (3), a water jacket entrance passage (4), an exit passage (5), a bypass passage (6) and a bypass opening (7) are located in the rear (transmission side) of a cylinder head (8) of the engine. A water pump and thermostat body (13) is attached to the rear face of the cylinder head (8). The bypass passage (6) together with the exit passage (5) are cast by using a metal mold drag. The coolant flow path forms a U-path starting with the coolant from the water pump (1) in the rear of the cylinder head (8) to the front of the cylinder head (8), then down to the front of the cylinder block (10), then to the rear of the cylinder block (10), then up to the rear of the cylinder head (8).

Abstract: An engine block comprises a top part of the crankcase that is reinforced by a separate bottom part of the crankcase with an oil pan arranged at an exterior case wall of the bottom part of the crankcase configured so that the lubricating oil to be returned from the upper case area into the oil pan is not taken along by rotating engine components because, the bottom part of the crankcase has a lubricating-oil passage that is arranged in a fastening flange and leads out between the exterior case wall and an interior case wall, wherein the interior case wall, as a semicylindrical shell and, is arranged so that it extends close to the contour of the connecting-rod "violin" arrangement and forms a reinforcing connection to an additional opposite fastening flange of the bottom part of the crankcase and wherein the shell that separates the crank space from a space above the oil pan additional passages that are preferably arranged tangentially with respect to the shell for the discharge of lubricating oil coming out o

Abstract: A timing case, for a cylinder head of an internal combustion engine having gas changing valves arranged essentially in parallel to one another, wherein the guiding of a camshaft 7, the timing case also has a divided bearing 8, the bottom part 8' of which is connected to a web 11 between breakthroughs 2, 3 provided for the guiding of the tappets 4 such that, in the case of narrowly adjacent breakthroughs 2,3, during the manufacturing, a cutting of the bearing bore 9 in the lower part 8' of the bearing is avoided with the result of a reduced bearing surface 12, the web 11, such that a wall thickness "s" that is smaller than the width "x" of the bearing 8, ends at such a distance "y" from the bearing surface 12 of the bearing bore 9 that a bearing wall 9' remains on both sides of the web 11 that has the bearing surface 12, the bearing wall 9' being connected with said web 11 in one piece.

Abstract: An especially air-flow-cooled two-cylinder, four-stroke-cycle, double-piston engine (1) for the preferred use in motorcycles has for each cylinder (32) a camshaft (14) disposed horizontally on top in the cylinder heads (33) for the drive of valves (37 and 38) disposed in vertical V-positions. An intermediate shaft (4) is connected in the drive of the camshafts (14) which is driven by the crankshaft (3) with 1:2 down-gearing, with said intermediate shaft (4) being arranged parallel below the crank shaft (3), being driven at its front end--in driving direction--, carrying a pump wheel (12') of a lubricating-oil pump (12) and having two 1:1 drives (13) leading from its rear end in one tunnel each (36) of the cylinders (32) and cylinder heads (33) to the camshafts (14). The camshafts (14) are arranged in the V-space of the valves (37 and 38) and are in driving connection with the valves (37 and 38) by means of rocking levers (39).

Abstract: A cylinder head for four-cycle internal combustion engines with a concave combustion space portion, in which are arranged one inlet and one exhaust valve each with a relatively small V-angle; the center axis of the inlet and exhaust valves are located in cross planes offset transversely to the V-angle; the spark gap of a spark plug is offset transversely to the exhaust valve and is arranged approximately in the cross plane of the inlet valve; the V-angle of the valves is pivoted toward the side of the inlet valve with respect to the associated cylinder center axis by an angle of about 2.degree. to about 10.degree.

Abstract: A cylinder head for water-cooled multicylinder pressure die-cast formed internal combustion engines comprises series-arranged combustion chambers. A longitudinal duct is arranged at a spacing essentially above the combustion chambers, and niche-like water spaces are all integrally formed toward the dividing plane between the cylinder head and the cylinder block, and are arranged substantially all around the combustion chambers. Connecting ducts emanate from the water spaces and terminate in the longitudinal duct.

Abstract: A water cooled cylinder head for an internal combustion engine which may be manufacturable by die-casting method in which all of the niche - shape water galleries are connected to the water jacket of the cylinder block through deformable openings in the cylinder head gasket surrounding the combustion chambers in which the openings are connected by cross channels and a lateral longitudinal channel. The upper limit of longitudinal channel is formed by the highest point in water galleries and cross channels wherein the longitudinal channel has a water outlet opening. A special arrangement of the niche-shaped water galleries, cross channels, and openings in cylinder head gasket with respect to the main components of cylinder head controls the cooling of the cylinder head in an advantageous manners.

Abstract: A valve-actuating lever, especially a rocker arm or drag lever, for internal combustion engines which is provided at its end actuating the valve on both sides of the valve abutment surface with one lateral guide surface each; the valve abutment surface is thereby formed at a valve-clearance adjusting element fixed at the lever between the lateral guide surfaces.

Abstract: An air intake system for a multi-cylinder internal combustion engine, especially an internal combustion engine with fuel injection, the intake system including a multi-partite distributor housing to which are connected first and second individual intake pipes with openings thereof lying in mutual opposition within the distributor housing. The distributor housing is divided in an area of the openings of the intake pipes at least in sections in the longitudinal direction of the individual intake pipes. Auxiliary pipes emanate from the openings of the intake pipes and are arranged in a mutually overlapping relationship in the distributor housing so that a simple and compact construction is realized with the possibility of having auxiliary pipes with great lengths within the distributor housing.

Abstract: An intake pipe arrangement for internal combustions is provided which includes an intake manifold and intake pipes arranged symmetrically pairwise at opposite sides thereof. In order to reduce the mutual vibrational influence of the intake pipes, the intake pipes are connected at the intake manifold with the end segments of the intake pipes approaching the intake manifold extending diagonally with respect to one another so that their imaginary extensions intersect in the intake manifold.

Abstract: The invention provides an air induction system or manifold for a multi-cylinder internal combustion engine, which is arranged in two parts, the first having portions of the induction passages for each cylinder formed therein, and the second attached to the first to form a housing therewith in communication with each of the induction passages, at least the first part being arranged so that it may be pressure die cast in manufacture.

Abstract: The invention provides an air induction system or manifold for a multi-cylinder internal combustion engine, which is arranged in two parts, the first having portions of the induction passages for each cylinder formed therein, and the second attached to the first to form a housing therewith in communication with each of the induction passages, at least the first part being arranged so that it may be pressure die cast in manufacture.