![]() ![]() ![]() The rest simulated adding a quart of heavier oil to thicken things a bit, or a quart of thinner oil to thin things down a bit. The first is the classic 50:50 Mobil 1 0w-40 and 0W20. I tried to pick combinations that replicate common mixing practices seen on BITOG. Here are the data for the viscosity calculations. Here are the average alpha values for Ed's samples, with the info in the parenthesis showing the approximate oil composition: Once you know the alpha for a given sample, you can calculate the viscosity for different fractions of the same two oils using: n1, n2, and n are the viscosities of Oil 1, Oil 2, and Mix, respectively. ![]() If you want to calculate the alpha for a given sample directly without trial and error, here is the formula:Īlpha = / (4) You need to have at least one measured sample to calculate the alpha empirically, from which you can calculate the viscosity for different mix ratios for the same two oils. (3) alpha values ranged from 0.42 to 1.46 in Ed's samples, greatly deviating from the Arrhenius equation and Widman mixing calculator, which assume alpha = 1. (2) Arrhenius equation and the Widman mixing calculator do not work! (1) Lederer - Roegiers equation when used with the proper alpha value works! I have finally got to calculate the empirical alpha values using the Blackstone KV100 for Oil 1, Oil 2, and Mix. ![]()
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