Patent ID: 6202626
Filing Date: 2001-03-20
Classification: F02B,F02D,F02M,Y02T

Abstract:
An internal combustion engine comprising a combustion chamber formed by a cylinder bore closed at one end by a cylinder head and by a piston reciprocating in said cylinder bore, at least one intake passage serving said combustion chamber through an intake port valved by an intake valve, a throttle valve in said intake passage upstream of said intake port moveable between an opened, full throttle position and a closed, idle position for controlling the flow through said intake passage into said combustion chamber, the area between said throttle valve and said intake valve being devoid of other flow control valves, at least one exhaust passage serving said combustion chamber through an exhaust port, an exhaust valve for controlling the flow through said exhaust port, valve actuating means for operating said intake valve and said exhaust valve between their open and closed positions, the ratio between the volumes of the portion of said intake passage between said throttle valve and said intake port and the maximum volume of said combustion chamber when said piston is at bottom dead center position being set to a predetermined ratio, said throttle valve being moveably supported within a throttle body separate from but attached to said cylinder head, said throttle valve being disposed inwardly of a plane parallel to said cylinder bore axis and containing the outer peripheral edge of the intake passage side of said cylinder head when said throttle valve is in said closed, idle position.