The air intake passage is arranged to introduce air to the chamber through a throttle valve for regulating an amount of {HEAD ~ the air} with {TAIL ~ an opening degree} thereof 
The air intake passage is arranged to introduce air to the chamber through a throttle valve for regulating an amount of { HEAD ~ the air } with { TAIL ~ an opening degree } thereof
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH