Abstract:
A fuel composition for internal combustion engines, and more particularly, a fuel composition for internal combustion engines containing less than about 0.5 gram of lead per gallon of fuel is described. The fuel provides acceptable valve seat protection in engines designed to operate on leaded or unleaded fuels. Ordinarily, leaded fuels contain components to reduce deposits within the engine cylinders which unleaded fuels do not. As leaded fuels become unavailable, some refiners will add valve protecting components to the unleaded fuels to satisfy the leaded market. Such fuels will then potentially cause an increase in the octane requirement. This invention deals with polybasic carboxylate additives having valve seat protection properties which avoid or minimize the octane requirement increase.
Abstract:
Mixtures of (A) hydroxyaromatic compounds (e.g., phenols) having no aliphatic substituents of more than 4 carbon atoms and (B) hydroxyaromatic compounds having at least one aliphatic substituent with at least about 12 carbon atoms may be oxidatively coupled to yield products useful as lubricant and fuel additives.
Abstract:
A method of reducing spark plug fouling in spark ignition engines fueled with organomanganese containing gasoline is described. The method features the use in gasoline of a spark plug anti-fouling amount of an organic molybdenum compound. Molybdenum naphthenate is an example of a useful anti-foulant compound.
Abstract:
A method of reducing spark plug fouling in spark ignition engines fueled with organomanganese containing gasoline is described. The method features the use in gasoline of a spark plug antifouling amount of an organic molybdenum compound. Molybdenum naphthenate is an example of a useful antifoulant compound.