<P> The two spark plugs in each cylinder can fire either sequentially or simultaneously , enabling more efficient burning during lean - burn mode and more often lean - burn operation . The engine can operate at a lean 22 : 1 air - to - fuel ratio more than 60 percent of the time on a flat road . The VTEC cylinder idling system of the engine closes the valves in three of the four cylinders when the car is decelerating , reduces the power lost to the engine by 50 percent , and allows the IMA to extract more electrical energy during braking . The rocker arms operating the intake and exhaust valves have two modes : valve - lift mode or idle mode . They are engaged via a synchronizing piston . During deceleration , the synchro piston disengages the lift - mode rocker arm so that the valves remain at rest , effectively sealing off the cylinder . </P>
<P> The two spark plugs in each cylinder can fire either sequentially or simultaneously , enabling more efficient burning during lean - burn mode and more often lean - burn operation . The engine can operate at a lean 22 : 1 air - to - fuel ratio more than 60 percent of the time on a flat road . The VTEC cylinder idling system of the engine closes the valves in three of the four cylinders when the car is decelerating , reduces the power lost to the engine by 50 percent , and allows the IMA to extract more electrical energy during braking . The rocker arms operating the intake and exhaust valves have two modes : valve - lift mode or idle mode . They are engaged via a synchronizing piston . During deceleration , the synchro piston disengages the lift - mode rocker arm so that the valves remain at rest , effectively sealing off the cylinder . </P>
how many spark plugs in a honda civic hybrid
how many spark plugs in a honda civic hybrid
two spark plugs in each cylinder
two spark plugs in each cylinder