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- Exhaust Gases
-
- Turbocharged
- engines use engine
- exhaust gases to
- spin the
- turbocharger
- impellers. The
- exhaust manifold
- route high velocity
- exhaust gases from
- the engine exhaust
- ports to the
- turbine inlet.
- After passing
- through the turbine
- blades, the exhaust
- gas passes to the
- 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-
-
-