The Sequence VIII test evaluates crankcase lubricating oils for their copper and lead corrosion control capabilities, along with shear stability under high temperature operating conditions
The Sequence VIII test involves steady state operation of the single cylinder CLR oil evaluation engine. After a 4-hour break-in and a 1/2-hour flush, the engine is operated under constant speed, air-fuel ratio and fuel flow conditions for an additional 40 hours. Prior to each run, the engine is thoroughly cleaned, and pertinent measurements of the engine parts are taken. A new piston, piston rings, and copper/lead connecting rod bearing are installed. The cylinder head is also reconditioned.
Key operating conditions for the Sequence VIII procedure:
| Test Parameters | Set Point |
|---|---|
| Duration | 40 h |
| Speed | 3150 ± 25 r/min |
| Load | Adjusted to provide proper fuel flow at the specified Air-to-Fuel Ratio |
| Fuel Flow | 2.25 ± 0.11 kg/h |
| Air-to-Fuel Ratio | 13.43 ± 0.5 |
| Engine Jacket Out Coolant Temperature | 93.5 ± 1°C |
| Engine Jacket Coolant Temperature Delta | 5.6 ± 1°C |
| Gallery Oil Temperature | 135.0 or 143.5 ± 1°C [B] |
| Crankcase Off Gas | 850 ± 28 SCL/h [A] |
[A] Controlled by adding sufficient ambient air to rocker box to achieve an Off Gas Flow of 30 ft3/h
[B] 135°C for SAE 5W, 10W; 143.5°C for SAE 20,30,40,50 and multi-viscosity grade oils
This test utilizes an unleaded fuel named "KA24E" which has a green identifying dye. It is supplied by Haltermann Products. At the conclusion of the test, the engine is disassembled and the performance of the oil tested is judged by the following:
- Weight loss of the copper/lead big end connecting rod bearing.
- Periodic oil sample analysis.
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