High power output engine

In a high power output internal combustion engine having a piston mounted to reciprocate in a cylinder, the improvement comprising, in combination:

• a cylinder head cooperating with said cylinder and piston to form a combustion chamber, said combustion chamber having first and second intake ports and at least one exhaust port, a first intake valve for controlling flow through the first intake port, a second intake valve for controlling flow through the second intake port, an exhaust valve controlling flow through the exhaust port, said valves all being mounted in said cylinder head, said intake valves being positioned on one side of said combustion chamber and said exhaust valve being positioned on the other side, a spark plug communicating with said combustion chamber and positioned on the side with the exhaust valve and near said first intake valve, means for supplying air-fuel mixture to each of said intake ports, said means including a first throttle valve operated by an acceleration pedal and located upstream of both intake ports, a second throttle valve located downstream of said first throttle valve to control flow through said second intake port, whereby to define the quantity of air-fuel mixture flowing through said second intake port at a lower rate than that flowing through said first intake port, and means coordinating movement of said first and second throttle valves.