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Sequence IVA Procedure

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Gasoline/ILSAC GF-3 Procedures


	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 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 KA24E Nissan 1994 2.4-liter, water-cooled, fuel-injected engine, 4-cylinder in-line, overhead camshaft with two intake valves, and one exhaust valve per cylinder.

The test is a 100-hour test of 100 hourly cycles. Each cycle consists of 2 operating modes or stages. Unleaded “Haltermann KA24E Green” fuel is used.

	STAGE 1	STAGE 2
Time, minutes	50	10
Engine Speed, rpm	800	1,500
Engine Torque, N-m	25	25
Oil Cylinder Head Temp, °C	49	59
Coolant Temp, °C	50	55

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 limit includes average cam wear of 120 μm maximum for API SL and ILSAC GF-3 and 90 μm maximum for API SM and ILSAC GF-4.

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.

Contact Information

Eric Liu

Sequence IVA Procedure

(210) 522-5937

eliu@swri.org

Related Terminology

Sequence IVA test

API SL

API SM

ILSAC GF-4

ILSAC GF-3

lubricant

camshaft lobe wear

overhead camshaft

engine

cam lobe

wear metals

Related Information

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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.

September 30, 2008