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The 6.5L diesel fuel economy improvement (FEI) test was developed by Southwest Research Institute (SwRI) to measure the effects of engine oils on the fuel economy of diesel engines. This dynamometer test is used to measure the fuel efficiency performance of engine oils under conditions analogous to a typical driving cycle during operation of a 6.5L diesel engine in a high-mobility multipurpose wheeled vehicle (HMMWV).
A 10-stage test protocol was developed following analysis of a military cycle recorded during field HMMWV operation. These data were a subset of data in Interim Report 377, “HMMWV Field Operation Data Collection and Analysis,” published by the U.S. Army TARDEC Fuels and Lubricants Research Facility at SwRI. The time-weight factors for the stages were determined by SwRI and represent the percentage of time the engine operates in the speed torque-oil temperature range.
Test Cycles
Test Conditions
Test Results
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Oil |
Stage |
Average BSFC (kg/kWh) |
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Nominal Power (kW) |
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Weighting |
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Fuel Consumed (kg) |
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Cycle 1 BC |
1 |
BSFC |
x |
1.7 |
x |
21% |
= |
|
|
2 |
BSFC |
x |
9.3 |
x |
2% |
= |
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3 |
BSFC |
x |
4.5 |
x |
2% |
= |
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4 |
BSFC |
x |
17.8 |
x |
7% |
= |
|
|
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5 |
BSFC |
x |
15.6 |
x |
1% |
= |
|
|
|
6 |
BSFC |
x |
13.6 |
x |
7% |
= |
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7 |
BSFC |
x |
22.6 |
x |
6% |
= |
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8 |
BSFC |
x |
29.7 |
x |
19% |
= |
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9 |
BSFC |
x |
36.8 |
x |
26% |
= |
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|
|
10 |
BSFC |
x |
43.8 |
x |
9% |
= |
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Total fuel consumed for all 10 stages |
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Summary of Test Method
A 1994 General Motors (GM) 6.5L diesel, V-8, 4-cycle engine is used as the test apparatus. The engine incorporates roller followers, two valves per cylinder, and mechanical fuel injection. Fuel used is a single batch of PC-9.
The 6.5L fuel economy test incorporates a flush-and-run procedure. Each test consists of two 10-stage fuel economy measurements on a baseline oil, one at the beginning of the test and one at the end. The test oil is evaluated in between the two baseline runs and aged during 16 hours of operation at 1,600 r/min and 85°C oil temperature. After aging, a 10-stage fuel economy measurement is taken. The two measurements on the baseline oil are used to calculate fuel economy improvement for the test oil.
For more information about our 6.5L diesel fuel economy improvement test capabilities or how you can contract with SwRI, please contact William A Buscher, at wbuscher@swri.org or (210) 522-6802.
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| Engine Lubricants Research Department | Fuels and Lubricants Research Division | SwRI Home |
Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.
December 28, 2012
