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	The Sequence IVA procedure at SwRI evaluates a lubricant's performance in preventing camshaft lobe wear in an overhead camshaft engine.

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 Procedure

The 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 Results

At 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:

• Kinematic viscosity

• Fuel dilution

• Wear metals: iron (Fe) and copper (Cu)

Sequence IVA Pass/Fail Criteria

PASS		FAIL

For more information about the Sequence IVA procedure capabilities at Southwest Research Institute (SwRI) or how you can contract with SwRI, please contact Eric Liu at eliu@swri.org or (210) 522-5937.
 

| 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 12 technical divisions.

August 24, 2009