Throttle body configured to provide turbulent air flow to a combustion chamber of an engine, and engine including same

In an engine having a cylinder block with a cylinder formed therein with a cylinder axis, and cylinder head attached to the cylinder block and having an air intake port formed therein communicating with an air intake passage and selectively routing air into the cylinder, the improvement comprising:

• the air intake port comprising a first air intake port and a second air intake port;
• a throttle body defining a portion of the air intake passage and having a throttle valve therein comprising a throttle plate affixed to a movable pivot shaft which pivots around a pivot axis which is transverse to a central axis of the throttle body, said throttle valve operable to control an intake air amount for said engine, wherein the pivot axis is offset and spaced away from the central axis of the throttle body such that a first portion of the throttle plate disposed on a first side of the pivot shaft is larger than a second portion of the throttle plate disposed on a second side of the pivot shaft,
• wherein the pivot shaft of the throttle valve is inclined at an angle, relative to a crossing axis extending perpendicular to the cylinder axis, and wherein the airflow control apparatus is configured in such a manner to increase intake air supplied to the first air intake port, as compared to an amount of intake air supplied to the second air intake port.