THE Conradson carbon-residue test is the generally accepted method for predicting the relative quantities of carbon an oil will deposit in an engine. This belief arises from the fact that, although publication of results of earlier researches in this field have shown that volatility of the oil is a controlling factor, it has been assumed that in all cases volatility is measured by the carbon-residue test. The results of tests conducted by the authors, covering a period of about two years, show that no such general relationship exists when the carbon-forming characteristics of a wide variety of oils are considered. This conclusion is drawn from 50-hr. tests of a large number of commercial lubricating oils in an engine operating under fairly heavy load and at moderate speed.The authors found that the volatility of the oil is the primary factor in engine carbon-deposition, and a laboratory method was developed for indicating the total volatility of a motor oil. The temperature of the 90-per-cent-distilled point at an absolute pressure represented by 1 mm. of mercury was found to be an excellent carbonization index, because a linear relation was found between this temperature and the quantity of carbon deposited. Other data showing the effect on carbon deposition of oil consumption, load, and length of time of operation are presented.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Factors Controlling Engine-Carbon Formation


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Pre-1964 SAE Technical Papers ; 1906



    Publication date :

    1931-01-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    HC and CO Formation Factors in a PCI Engine

    Iwashina, Tomoya / Chen, Zhili | SAE Technical Papers | 2009


    HC and CO formation factors in a PCI engine

    Chen,Z. / Iwashina,T. / Tokai Univ.,JP | Automotive engineering | 2009


    Carbon monoxide formation by gasoline engine vehicles

    Brunner, M. | Engineering Index Backfile | 1958


    ENGINE CONTROLLING APPARATUS

    YOSHIDA SOTARO / SUGANO HIROSHI / ARIYAMA TAKASHI et al. | European Patent Office | 2017

    Free access

    Engine controlling apparatus

    KAMIYA YUSUKE | European Patent Office | 2016

    Free access