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 TM 55-1905-220-14-10
5-33. ENGINE ASSEMBLY-REMOVAL AND RUN-IN-MAINTENANCE INSTRUCTIONS.
LOCATION
ITEM
ACTION
REMARKS
ENGINE RUN-IN INSTRUCTIONS (Cont)
(2)
Dynamometer
(a)
The function of the dynamometer is to absorb and measure the
engine output. Its basic components are a frame, engine
mounts, the absorption unit, a heat exchanger, and a torque
loading and measuring device.
(b)
The engine is connected through a universal coupling to the
absorption unit. The load on the engine may be varied from zero
to maximum by decreasing or increasing the resistance in the
unit. The amount of power absorbed in a water brake type
dynamometer, as an example, is governed by the volume of
fluid within the working system. The fluid offers resistance to a
rotating motion. By controlling the volume of water in the
absorption unit, the load may be increased or decreased as
required.
(c)
The power absorbed is generally measured in torque (lb-ft) on a
suitable scale. This value for a given engine speed will show the
brake horsepower developed in the engine by the following
formula:
BHP = (T x RPM)/5250
Where:
BHP = brake horsepower
T = torque in lb-ft
RPM = revolutions per minute
(d)
Some dynamometers indicate direct brake horsepower readings.
Therefore, the use of the formula is not required when using
these units.
(e)
During the actual operation, all data taken should be recorded
immediately on an Engine Test Report (see sample) on page 5-
530.
5-528
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