Inverted port engine with cross-under intake passage

摘要

The present invention is an inverted port L-head engine (14) having a cross-under intake passage (54). The carburetor (16) and exhaust system (24) are disposed on opposite sides of the cylinder (18), and the exhaust valve (36) is located over the intake valve (38) on the exhaust side. The cast cylinder has openings (50, 56) for receiving ends (52, 58) of a cross-under tube (22) which provides the intake passage from the carburetor to the intake valve. The U-shaped cross-under tube extends under the piston bore (44) and is slidably received in the cylinder block openings. Sealant (66) may be used to form airtight seals between the tube ends and the cylinder openings.