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The Sequence IVA procedure (ASTM D 6891) evaluates a lubricant’s performance in preventing camshaft lobe wear in an overhead camshaft engine. Taxi cab, light-delivery truck, or commuter service is simulated. Sequence IVA Test Equipment and ProcedureThe Sequence IVA test fixture is a 1994 Nissan KA24E, 2.4-liter, water-cooled, fuel-injected engine, 4-cylinder in-line, overhead camshaft with 2 intake valves, and 1 exhaust valve per cylinder.
The test is a 100-hour test involving 100 hourly cycles. Each cycle consists of 2 operating modes or stages. Unleaded “Haltermann KA24E Green” fuel is used.
Sequence IVA Test ResultsAt the end of the test, each of the 12 cam lobes is measured at 7 locations using a surface profilometer, which measures maximum depth of wear. Measurements of wear on all 7 positions of each lobe are added; then all 12 lobe measurements are averaged for the wear result. This result is the primary evaluation for the test.
At 100 hours, the used oil is evaluated for:
Sequence IVA Pass/Fail Criteria
For more information about the Sequence IVA procedure, or how you can contract with Southwest Research Institute (SwRI), please contact Eric Liu at eliu@swri.org or (210) 522-5937.
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| Engine Lubricants Research Department | Fuels and Lubricants Research Division | SwRI Home | |
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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. |
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December 28, 2012 |
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