f. Engine exhaust. The overall PWL of the noise
gases and results in approximately 6dB reduction
radiated from the unmuffled exhaust of an engine
in noise. Thus, T = 0 dB for an engine without a
is given by table 2-4 or equation 2-3:
turbocharger, and T = 6 dB for an engine with a
turbocharger. In table 2-4, "Base PWL" equals
119 + 10 log (rated hp). The octave-band PWLs of
where T is the turbocharger correction term and
unmuffled exhaust noise are obtained by sub-
tracting the values in the lower part of table 2-4
turbocharger takes energy out of the discharge
from the overall PWL.
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