Method and system for operating two-and four-stroke engines using low sulfur fuels
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United States of America Patent
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Issued Date -
Jun 26, 2008
app pub date -
Dec 11, 2007
filing date -
Dec 11, 2006
priority date (Note) -
Abandoned
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Abstract
A method for operating a two-stroke engine using low sulfur fuels. Blended cylinder oil is produced by blending base oil and at least one additive where the total base number ('TBN') of the blended cylinder oil ranges from 1 TBN to 20 TBN. The engine is operated by supplying the blended cylinder oil and a fuel having less than 1.0% sulfur to the engine cylinders. The additive includes a low TBN calcium salts at a weight ratio ranging from 90:10 to 10:90; or any combination thereof. A method for operating a 4-stroke engine using low and high sulfur fuels. Blended oil, having a TBN that is greater than 20 TBN, is produced by blending base oil and at least one additive. The engine is operated by exchanging a low sulfur fuel having less than 1.0% sulfur with a high sulfur fuel. The engine lubricating system is switched to the blended cylinder oil in accordance with switching the fuel from a low sulfur fuel to a high sulfur fuel.
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