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US 7,900,590 B2Granted
Methods and lubricant and fuel compositions for two-stroke engine containing power valves
AssigneeThe Lubrizol Corporation
InventorsWilliam K. S. Cleveland, Laimute R. Svarcas
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Abstract
Methods, a lubricant composition, and a fuel composition for lubricating a two-stroke internal combustion engine include a lubricant composition that contains (A) an oil of lubricating viscosity, (B) an additive composition, and (C) a normally liquid solvent having a kinematic viscosity of less than 5 cSt at 100° C. The lubricant composition improves the cleanliness of a power valve of a two-stroke engine.
Claims8
A method for lubricating a two-stroke internal combustion engine containing a power valve, comprising:
- (I) mixing a lubricant composition with a fuel composition wherein the weight ratio of the fuel to the lubricant composition in the mixture is 25-100:1;
- and
- (II) supplying said mixture to a two-stroke internal combustion engine containing a power valve;
- wherein the lubricant composition comprises:
- (A) an oil of lubricating viscosity;
- (B) an additive composition comprising
- (1) a reaction product of a fatty hydrocarbyl-substituted monocarboxylic acylating agent and a polyamine, wherein the monocarboxylic acylating agent comprises tall oil fatty acids, oleic acid, stearic acid or isostearic acid, wherein the polyamine comprises alkylenediamines, N-alkyl alkylenediamines, or polyalkylenepolyamines, and wherein the reaction product comprises a heterocyclic reaction product wherein the reaction product is present in the overall composition at about 2 percent by weight;
- and
- (2) a Mannich reaction product of a hydrocarbyl-substituted phenol, an aldehyde, and an amine wherein the Mannich reaction product is present in the overall composition at no more than 7.4 weight percent on an actives basis;
- and
- (3) a friction modifier component comprising glycerol monooleate or a mixture of glycerol monooleate and glycerol dioleate friction modifiers wherein the friction modifier component is present in the overall composition from about 0.3 to about 0.5 percent by weight;
- and
- (C) a normally liquid solvent having a kinematic viscosity of less than 5 cSt at 100° C. wherein the lubricant composition improves the cleanliness of the power valve of said engine, wherein the solvent is present from 1 to 50 percent by weight of the lubricant and has an ASTM D-93 flashpoint and ASTM D-86 distillation characteristics rendering it combustible;
- wherein all weight percent values are on an actives basis;
- and
- wherein the fuel comprises a petroleum distillate fuel, an oxygenate, or a mixture thereof.
13 more elements
Dependencies are inferred from the claim text.