AR Services and Capabilities > Gasoline Fired Engine Lubricant Tests > Sequence VIII

Sequence VIII Engine Evaluation of Engine Oils

The Sequence VIII test is designed to evaluate crankcase lubricating oils for their copper and lead corrosion control capabilities. It also evaluates shear stability under high temperature operating conditions.

The Sequence VIII 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.

The key operating conditions for this procedure are as follows:

Parameter	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 being tested is judged by the following: