Fuel Injectors
The fuel injectors are solenoid-actuated constant-stroke pintle type, consisting of a solenoid, plunger needle valve and housing. When current is applied to the solenoid coil, the valve lifts up and pressurized fuel is injected close to the intake valve. Because the needle valve lift and the fuel pressure are constant, the injection quantity is determined by the length of time that the valve is open, determined by the duration current is supplied to the solenoid coil. An O-ring and seal ring at the top and bottom seal the fuel injector. These seals also reduce operating noise. See Fig 1 and Fig 2 .