Posted by DLMKA on December 09, 2014 at 12:10:36 from (192.189.128.12):
In Reply to: Diesel fuel lubricant posted by 37Chief on December 08, 2014 at 18:58:19:
My day job is as a fuel system design engineer for a diesel engine manufacturer.
Fuel lubricity is measured by wear scar. It's a specialized test that measures the width of a flat spot on a hard steel ball after cycling it back and forth with a certain load. ASTM requires ULSD to be less than 520 um wear scar with typical values in the 300-350 range. Kerosene and Jet-A is much worse, typically around 650 um wear scar and TOYU (sp?) fuel from Japan is awful stuff with a wear scar around 720um. We test our components with a special Kerosene with all the lubricity removed and during the testing process we run the fuel through a clay filter that removes any resulting parrafins that would reduce the wear scar. It's typical wear scar is 750um.
A new generation diesel engine designed around the time of the introduction of ULSD will run just fine on ULSD without the use of any lubrication modifiers.
Early diesel engines had relatively low injection pressures and resulting stress and need for enhanced lubrication of moving parts in the fuel pump and injectors.
The problem era is early 90s and later engines (EPA Tier 2 and later) with electronic controls (multi shot modes) and higher injection pressures before the advent of ULSD may need some added fuel lubricity.
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