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- Impeller
-
- Turbocharged
- engines use engine
- exhaust gases to
- spin the
- turbocharger
- impellers.
-
- The exhaust
- manifold route the
- high velocity
- exhaust gases from
- the engine exhaust
- ports to the
- turbine inlet.
- After passing
- through the turbine
- blades the exhaust
- gas is carried to
- muffler and out the
- tailpipe in the
- usual manner.
-
- Inside the housing
- of the
- turbocharger, a
- shaft suspended by
- high-speed
- bearings, connects
- the compressor
- turbine to the
- impeller. As
- engine RPM
- increases, the
- rising exhaust
- pressure and gas
- velocity allow the
- turbine blades to
- supply more power
- to the impeller.
- The spinning
- impeller blades
- draw air into the
- turbocharger and
- force it into the
- intake under
- pressure. As
- impeller RPM
- increases, so does
- the pressure or
- "boost" supplied to
- the engine intake.
-
- Turbocharger
- impellers may spin
- at speeds ranging
- from 50000 to
- 100000 RPM. The
- impeller portion of
- the turbocharger
- operates at low
- temperatures
- compared to the
- turbine and is
- usually cast from a
- lightweight, high
- strength aluminum
- alloy.
-
- -end-
-
-