Valid 3 Soot / Wear

1. Valid 3Soot / Wear Presented to Cummins ISM Task Force 09 November 2004 Columbus, IN jar

2. Using all 12 valid tests (except for soot target) and calculated residuals from oil means for crosshead weight loss, it looks like there was some relationship between TGAAVG and XHead Weight Loss within an oil.

3. Plotting the same 12 residuals versus TGA soot at 200 hours, if we ignore Lab D, looks like wear increased with increased soot. The only oil tested with high and low targeted soot was 1004-3.

4. If we restrict this plot to the seven tests with higher soot target, the picture is harder to decipher. If we look within each of the two oils and ignore the test from lab D, it looks like wear increases with soot.

5. But, if in the previous plot, we start with outlier corrected crosshead weight loss, the story changes for 830-2.

6. If we had to pick a correction today, it should probably beXHead Weight Loss (Soot Adjusted) = Xhead Weight Loss – (TGAAVG-4) x 3.This adjustment could apply whether we use outlier correction or not.

7. This is what soot adjustment would do to XHead weight loss.

8. This is what soot adjustment would do to outlier corrected XHead weight loss. In both charts, we see that soot adjustment moves IMSA above 830-2.