PRIN. OF INTERNAL COMBUSTION ENGINES - OD1619 LESSON 2/TASK 1
containing two chambers. One chamber contains a turbine that is spun as hot
exhaust gases are directed against it. The turbine shaft drives an impeller that
is located in the other chamber. The spinning impeller draws an airfuel mixture
from the carburetor and forces it into the engine. Because the volume of exhaust
gases increases with engine load and speed, the turbocharger speed will increase
proportionally, keeping the manifold pressure fairly uniform. A device known as a
waste gate is installed on turbocharged engines to control manifold pressure. It
is a valve which, when open, allows engine exhaust to bypass the turbocharger
turbine, effectively reducing intake pressure. The wastegate valve is operated by
a diaphragm that is operated by manifold pressure. The diaphragm will open the
wastegate valve whenever manifold pressure reaches the desired maximum.
FIGURE 46. MUFFLER.
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