the specification’s inception. However, unfortunately it has not been possible to develop an acceptable test in time for inclusion in the 2016 specification.
In our view, as fuel economy becomes more important to motorcycle OEMs, the inclusion of a gear pitting test relevant to the wear conditions experienced in a motorcycle is increasingly important. The development of such a test will enable clear differentiation between a properly formulated motorcycle oil designed to protect the gears, clutch and engine, and a passenger car motor oil designed only to protect the engine. There may also no longer be a need for the current phosphorus requirement of between 800 ppm and 1,200 ppm when a test is included, but until then the current limits will continue to serve the industry’s interim needs.
Along with the need to update friction plates and reference oils, these challenges led the JAMA MCO Working Group to begin updating the specification. After a considerable amount of industry effort, the revised JASO T 903:2016 specification was released at the end of April 2016.
The key changes and timings JASO has introduced new clutch friction plate materials and new reference oils to discriminate oil performance more clearly for the 2016 specification. In addition, the limits for friction severity for JASO T 903:2016 have been set back to the 2006 level in order to prevent MB oils from being able to achieve MA performance.
The first allowable use of the new JASO specification will be October 1 2016, but there will be an overlapping period when oil marketers will be allowed to file according to the 2011 or 2016 standard.
The last date when a new notification can be accepted for the 2011 standard is September 30 2016, and the expiration of the on-file data is set for April 30 2021.
Changes to the specification mean that resources will be needed to test and reapprove currently certified oils. An increase in the severity, in terms of friction performance, is expected for MA oils to prevent low friction MB oils containing friction modifiers from being categorised as JASO MA/MA1. For MB oils, an improvement in the stability of the formulation package is likely, which should need less friction modifier to meet the JASO T 903:2016 requirements.
Gear pitting test becoming increasingly essential
JAMA had hoped that a gear pitting performance requirement would be incorporated into this latest revision, something they had requested since
Most motorcycle oils are currently SAE 10W-40, but we are already seeing a growing interest in lower viscosity grades. This trend makes wear control even more of a challenge and the gear pitting test is needed to ensure adequate hardware protection is delivered by these low viscosity oils.
Following the usual five-year cycle, the next JASO T 903 4T specification update is expected in 2021 and Infineum expects the development of a reliable gear pitting test to be the number one priority for this next revision. Although there is still a long way to go to finalise the test, Infineum hopes that if it can be developed in the next year or two JASO may not wait until 2021 to bring it into the specification.
LINK
www.infineuminsight.com
LUBE MAGAZINE NO.135 OCTOBER 2016
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