Select ‘‘Set Up for CompuchekT’’ from the ‘‘Special Func-
tions Menu’’. The Compulink™ must be left in this mode
throughout the test. Future generations of Compulink™
cartridge software will allow Compulink™ in the monitor
mode while running tests with parameters bypassed.
The setup is now completed, and the auto/manual throttle
control can be used to control engine speed.
Use the active keys to cancel or back up the Compulink™
when the test is complete.
Fuel Flow Measurement on Engine or
Chassis Dynamometer (8-02)
Accurate fuel flow measurement is important for evalu-
ation of engine performance and troubleshooting on an
engine or chassis dynamometer. The only way accurate
fuel flow measurement can be obtained is through proper
use of the available equipment. Below is a description of
the fuel measuring device, available from Cummins En-
gine Company, along with installation and operation rec-
ommendations. The fuel measuring device, Part No.
3376375, can be used with either a chassis or engine
dynamometer.
Installation
When installing the fuel measuring device, it is important
to reduce the amount of air that can be introduced into the
system when the device is not in use. Therefore, the
plumbing used must include non-restrictive shutoff
valves, such as ballcock valves, to contain fuel in the
device after each use. Additional installation consider-
ations are:
• The fuel measuring device, Part No. 3376375, must
be mounted vertically to ensure accuracy and proper
operation.
• A separate fuel supply for use on the dynamometer
is recommended. All fuel used in the measuring
device must be clean for consistent operation.
• Care must be taken to reduce fuel line restriction to
and from the engine. Minimum recommended hose
sizes are No. 10 for the engine fuel inlet, and No. 8
for the engine fuel drain. The length of either hose
must not exceed 15 feet.
• For accurate fuel consumption or flow measure-
ment while testing on a chassis dynamometer, it is
recommended to use a fuel cooler to maintain inlet
temperature to the fuel gear pump at 49°C [120°F]
or below.
Fuel Flow Measurement on Engine or Chassis Dynamometer (8-02) Engine Testing
N14Page 8-20
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