PIPER SENECA II SERVICE MANUAL
VIII - POWER PLANT
01/01/09
2B2
8-24. TURBOCHARGER.
The turbocharger system consists of a turbine and compressor assembly, ground adjustable waste gate
assembly and the necessary hose and engine air intake ducts. The ground adjustable waste gate assembly
allows exhaust gas to bypass the turbine and flow directly overboard. In the closed position, the waste
gate valve diverts the exhaust gases into the turbine. The turbocharger requires little attention between
overhauls. However, it is recommended that the items outlined in the Inspection Report, Section III be
checked periodically.
8-24a. TURBOCHARGER NOMENCLATURE.
Many unfamiliar terms may appear on the following pages of this manual. An understanding of these
will be helpful, if not necessary, in performing maintenance and troubleshooting. The following is a list
of commonly used terms and names as applied to turbocharging and a brief description.
Term
Meaning
Supercharge
To increase the air pressure (density) above or higher than ambient
conditions.
Supercharger
A device that accomplishes the increase in pressure.
Turbo-supercharger
More commonly referred to as a “Turbocharger” this device is driven by a
turbine. The turbine is spun by energy extracted from the engine exhaust gas.
Compressor
The portion of a turbocharger that takes in ambient air and compresses it
before discharging it to the engine.
Turbine
The exhaust driven end of the turbocharger unit.
Ground Boosted or
These phrases indicate that the engine depends on a certain amount of
turbo-
Ground Turbocharged
charging at sea level to produce the advertised horsepower. An engine that is
so designed will usually include a lower compression ratio to avoid
detonation.
Deck Pressure
The pressure measured in the area downstream of the turbo compressor
discharge and upstream of the engine throttle valve. This should not be
confused with manifold pressure.
Manifold Pressure
The pressure measured downstream of the engine throttle valve and is almost
directly proportioned to the engine power output.
Normalizing
If a turbocharger system is used only to regain power losses caused by
decreased air pressure of high altitude, it is considered that the engine has
been “normalized.”
Summary of Contents for PA-34-200T Seneca II
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