This paper describes a technique which can accurately measure firing-cylinder full-load absolute pressure during critical intake events, thereby providing useful cylinder-pressure data for valve-timing optimization. To achieve this, an absolute-pressure transducer is connected to a port drilled through the cylinder wall at an axial location uncovered approximately midway through the piston stroke. This placement spares the transducer from thermal shock caused by flame-front impingement upon the diaphragm, since the combustion is normally completed by the crank angle of passage exposure.The described technique was used to study valve-timing and manifold-runner design effects on the intake process of a V-8 engine and to determine thermal-shock magnitudes and their effect on conventionally-measured pumping-loop data. The results indicate the technique could be a valuable intake-system development tool and also revealed large thermal-shock errors which destroyed conventionally-measured pumping-loop accuracy.


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    Title :

    Measuring Absolute-Cylinder Pressure and Pressure Drop Across Intake Valves of Firing Engines


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Fuels & Lubricants Meeting & Exposition ; 1994



    Publication date :

    1994-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Measuring Absolute-Cylinder Pressure and Pressure Drop Across Intake Valves of Firing Engines

    Puzinauskas, P. V. / Eves, J. C. / Tillman, N. F. et al. | British Library Conference Proceedings | 1994



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