What is a exhaust pigtail valve?

yes it is Answer . the intake valve is bigger because the oxygen needs to get into the chamber faster than it needs to get out

Because much smaller than the exhaust air flow velocity, in order to reduce intake resistance and improve gas flow, to increase engine power! Some of the engine intake lift not only large, more than...

intake valve is bigger.

The EGR valve takes unburnt gas vapors from the exhaust and sends it back through the intake manifold to be burnt. The EGR valve takes unburnt gas vapors from the exhaust and sends it back through...

The intake valve is bigger.