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Mack T-11 Rotational Viscosity Task Force Data & Pictures

This document presents the findings of the Rotational Viscosity Task Force, including potential improvements in repeatability and reproducibility of viscosity measurements, extension to higher soot levels, and the possible use of a rate index for PC-10.

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Mack T-11 Rotational Viscosity Task Force Data & Pictures

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  1. Mack T-11Rotational Viscosity Task ForceData PicturesPresented to Mack Surveillance PanelSeptember 9, 2005 Jim Rutherford (510) 242-3410 jaru@chevrontexaco.com

  2. Rotational Viscosity Task Force Mission From minutes of the last Mack Surveillance Panel: A Task Force consisting of Jeff Clark, Charlie Passut, Greg Shank, Steve Kennedy, Wim Van Dam, Phil Scinto and Jim Rutherford was formed to consult with Herman George and investigate the following areas: - Potential for improved repeatability and reproducibility of viscosity measurements at 6% soot. - Extension to higher soot levels. - Possible use of rate index in lieu of viscosity slope for PC-10 (150 to 200 hours). Rotational Viscosity Task Force

  3. Summary • When viscosity is at the highest levels, kinematic viscosity goes into a steep slope with associated high variability. Rotational viscosity remains more linear through the range of T-11 testing on the reference oil. Viscosities tend to rank the same for both approaches. • The relationship between kinematic viscosity slope and rotational viscosity index seems to be a function of laboratory. • Precision and discrimination need be examined together to determine whether one has a clear advantage. This isn’t possible with only one reference oil. • It still seems that interpolating soot at a specified viscosity increase is more appropriate than interpolating either viscosity at a specified soot level. • The Task Force appears to have consensus and agreement from Herman George to drop rotational viscosity measurements for the Mack T-11. Rotational Viscosity Task Force

  4. Notes • These analyses use the T-11 LTMS data from August 11, 2005. • There are many missing rotational viscosity measurements. Each chart uses all available non-missing data. • Kinematic viscosities shown in the charts have each had 90 pass DIN sheared kinematic viscosities subtracted. This adds to the variability of the kinematic viscosities. • Rotational viscosities shown in the charts have the number 11 subtracted. This is because so many tests had missing 90 pass DIN sheared rotational viscosity while 11 was the approximate average of those values present. The rotational viscosities thus have artificially lowered variability relative to test precision. Rotational Viscosity Task Force

  5. Potential for improved repeatability and reproducibility of viscosity measurements at 6% soot. Rotational Viscosity Task Force

  6. Extension to higher soot levels – Interpolated Rotational and Kinematic Viscosity at 6.5% Soot Rotational Viscosity Task Force

  7. Extension to higher soot levels – Interpolated Rotational and Kinematic Viscosity at 7% Soot Rotational Viscosity Task Force

  8. Possible use of rate index in lieu of viscosity slope for PC-10 (150 to 200 hours). Rotational Viscosity Task Force

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