Patent ID: 7296560

Claim:
An engine of spark-ignition type which injects fuel from an injector ( 3 ) into an intake port ( 2 ) provided in a cylinder head ( 1 ), wherein the injector ( 3 ) has fuel injection holes ( 35 ), ( 36 ) oriented toward an inner wall surface of the intake port ( 2 ) and makes a start ( 3 a ) of the fuel injection during an exhaust stroke of each of cylinders ( 5 ) and ( 6 ), the injected fuel collides against the inner wall surface of the intake port ( 2 ), wherein when seen in a direction parallel to cylinder center axes ( 30 ), ( 31 ), on the assumption that a direction where the cylinders ( 5 ) and ( 6 ) are arranged is taken as a left and right direction, and a width direction of the cylinder head ( 1 ) perpendicular to this left and right direction is deemed as a front and rear direction optional one of which is regarded as a rear direction, one throttle body ( 7 ) is used for a pair of adjacent left and right cylinders ( 5 ) and ( 6 ) and is arranged rearwardly of the cylinder head ( 1 ). the throttle body ( 7 ) being provided with one throttle intake passage ( 7 a ) and one throttle valve ( 8 ), a central intake port wall ( 34 ) is conducted from between the respective valve ports ( 5 a ), ( 6 a ) of the left and right cylinders ( 5 ), ( 6 ) to the throttle intake passage ( 7 a ) and has left and right sides formed with the intake port ( 2 ), through which the respective valve ports ( 5 a ), ( 6 a ) are communicated with the throttle intake passage ( 7 a ), wherein the injector ( 3 ) is attached to the throttle body ( 7 ), wherein one injector ( 3 ) is utilized for one throttle body ( 7 ), and wherein the injector ( 3 ) has a front end portion directed toward the central intake port wall ( 34 ) ahead thereof and the left and right fuel injection holes ( 35 ), ( 36 ) are arranged at this front end portion of the injector ( 3 ), the fuel injected separately in the left and right directions from these left and right fuel injection holes ( 35 ), ( 36 ) being adapted to respectively collide against the inner wall surfaces of the intake port 2 on the left and right sides of the central intake port wall ( 34 ).