The name Minneapolis is attributed to Charles Hoag, the city's first schoolteacher, who combined mni, a Dakota Sioux word for water, and polis, the Greek word for city.
EGR valve on top of the inlet manifold of a Saab H engine in a 1987 Saab 90. In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NOx) emissions reduction technique used in petrol/gasoline and diesel engines. EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders.
The catalytic converter, which is responsible for the recirculation of unburned gases back to the engine and the cleanup of a vehicle's exhaust, is a key component of a vehicle's emission control system.he catalytic converter, which is responsible for the recirculation of unburned gases back to the engine and the cleanup of a vehicle's exhaust, is a key component of a vehicle's emission control system.