Abstract: An internal combustion engine having a crankcase with at least one cylinder and a coolant passageway formed therein surrounding said cylinder. An engine air intake supplies combustion air to the cylinder, and a coolant pump pumps coolant through the coolant passageway for cooling the cylinder. A reservoir in fluid communication with the air intake collects coolant leaking from the coolant pump. Coolant in the reservoir is drawn into the air intake, and ingested by the cylinder.

Abstract: An air filtration system for an internal combustion engine is provided wherein the air filter has an exit orifice for sealingly engaging the air intake duct of a carburetor via a friction-fit. The friction-fit provides an integrated seal between the orifice and duct such that additional sealing means are not required. The friction-fit can be provided by a plurality of ridges formed along the interior surface of the orifice or by decreasing the cross-sectional area of the orifice in the direction of the internal cavity formed by the filter walls. Decreasing the cross-sectional area of the orifice is accomplished by providing a plurality of stepped diameters of a bottom surface material or a surface that conically slopes inward towards the cavity. In addition, the air filter can be secured to a platform of an engine by a holding arm having a hook shaped distal end with a catch that can be disengaged by pulling at a grip, thus allowing easy access to the filter for inspection, cleaning, and replacement.

Abstract: A one-bolt connecting rod for an internal combustion engine, compressor or other machine; a structure for aligning the shank and cap parts of a two-piece connecting rod; an aluminum fastener for aluminum connecting rods; an extrusion process for making connecting rods; and connecting rod parts made by a fine blanking process. In the one-bolt connecting rod, the unbolted junction of the shank and cap is of the hook-on-lug type, and the bolt runs longitudinally through the junction. The alignment structure is on one side a V-junction with contact only between slanting walls and on the other side a junction of two single-plane walls. The aluminum fastener is a threaded aluminum stud.