TWO-VALVE ENGINE

摘要

The present invention provides a two-valve engine in which fuel economy can be improved while also suppressing combustion noise. This two-valve engine includes: a crankshaft; a rolling bearing; a piston part; a cylinder part including a cylinder head that has one intake port and discharge port, and a cylinder body that has a cylinder bore, said cylinder part forming a combustion chamber together with the piston part; a fuel injection part; and an ignition part provided to one area among two areas defined by dividing the combustion chamber using a straight line passing through the center of the intake port and the center of the discharge port. The combustion chamber has a non-squish area in at least some of the outer periphery of the combustion chamber. When viewed in the center axial direction of the cylinder bore, an intake passage is provided such that the non-squish area and an area in which the ignition part is not disposed are placed above a straight line that is an extension of the center axis of the intake passage from the center of the intake port.