CUMMINS N14 Specifications download pdf (Page 469)

100

101

Chassis Dynamometer Operation

(14-04)

The performance of an engine installed in ‘‘on-highway’’

vehicles can be tested on a chassis dynamometer.

NOTE: Due to driveline inefficiencies and engine-driven

accessories, the rated horsepower will be reduced by ap-

proximately:

• 20 percent for single axle vehicles

• 25 percent for tandem axle vehicles

The net horsepower available is called wheel horsepower

(WHP).

NOTE: These percentages are used for engine run-in only

and are not to be used as absolute figures.

Caution: Before installing or operating a vehicle on a

chassis dynamometer, follow all the vehicle manufac-

turer’s safety precautions.

Caution: Low profile radial tires are more sensitive to

heat than bias ply tires. Excessive operating time at full

load can damage tires due to overheating. Check the tire

manufacturer’s recommendations for the maximum al-

lowable chassis dynamometer operating time.

The following are general safety precautions to be ob-

served while operating the chassis dynamometer.

• Use tires that have more than 160 kilometers [100

miles] on them. Do not use new tires.

•Donot use recapped tires or tires of different sizes

or designs.

Engine Testing Chassis Dynamometer Operation (14-04)

N14 Page 14-29

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CUMMINS N14 Specifications Page 469

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