Development of the Sequence IVA Valve Train Wear Lubricant Test: Part 1

2000-01-1820

06/19/2000

Event
CEC/SAE Spring Fuels & Lubricants Meeting & Exposition
Authors Abstract
Content
The ASTM Sequence VE test evaluates lubricant performance for controlling sludge deposits and minimizing overhead camshaft lobe wear. ILSAC asked JAMA to develop a new valve train wear replacement test since the Sequence VE test engine hardware will become obsolete in the year 2000. JAMA submitted the JASO specification M 328-951) KA24E valve train wear test. This first report presents the results of technical studies conducted when JASO M 328-95 was reviewed and the ASTM standardized version of the KA24E test (the Sequence IVA) was proposed.
The cam wear mechanism was studied with the goal of improving reproducibility and repeatability. Engine torque was specified to stabilize the NOx concentration in blow-by, which improved test precision. Additionally, the specifications for induction air humidity and temperature, oil temperature control, and test fuel composition were modified when the ASTM version of the KA24E test was proposed. The KA24E correlation to Sequence VE wear was studied, and good agreement was documented. The correlation between field performance and KA24E engine test results was also investigated. Field tests conducted with two different wear level oils ranked wear similarly to the KA24E engine tests. Based on these studies, the KA24E test was proposed as the ASTM Sequence IVA test method.
Meta TagsDetails
DOI
https://doi.org/10.4271/2000-01-1820
Pages
15
Citation
Sagawa, T., Nakamura, K., Buscher, W., and Bendele, L., "Development of the Sequence IVA Valve Train Wear Lubricant Test: Part 1," SAE Technical Paper 2000-01-1820, 2000, https://doi.org/10.4271/2000-01-1820.
Additional Details
Publisher
Published
Jun 19, 2000
Product Code
2000-01-1820
Content Type
Technical Paper
Language
English