Motor oils contribute to combustion-chamber deposits and therefore to octane-requirement increase (ORI) and surface ignition. An investigation of the separate components of motor oils in laboratory engines showed that base oils add the largest increment to ORI, viscosity-index improvers add less, and detergents and inhibitors add the least. Surface ignition is reduced by phosphorus, barium, calcium, and zinc ─ elements commonly found in motor-oil additives. Phosphorus is especially effective; all tested additives containing it were equally effective at the same concentration of phosphorus.The components chosen for a motor oil determine how much it will contribute to ORI and surface ignition. A good choice of base stock, viscosity-index improver, and detergent for an SAE 10W-30 oil gives an ORI 6 octane numbers lower than a poor choice. Similarly, choosing phosphorus-containing detergents and inhibitors reduces octanes needed to suppress surface ignition as much as l4 units. Good formulation of motor oils can do much to save costly octane numbers.


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    Title :

    OCTANES FROM MOTOR OILS


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Pre-1964 SAE Technical Papers ; 1906



    Publication date :

    1958-01-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English


    Keywords :


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