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Measurement of Piston and Ring Assembly Friction Instantaneous IMEP Method
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1983 by SAE International in United States
Annotation ability available
An experimental technique termed the Instantaneous IMEP Method has been developed to measure piston and ring assembly friction. The technique requires very accurate measurements of cylinder pressure, connecting rod force and calculation of inertial forces. Friction force is the difference of these forces in consideration of the slider-crank geometry. A grasshopper linkage has been used to transmit the connecting rod force signal measured by a strain gage bridge. Inertial forces have been calculated with the assumption of distributed connecting rod mass. The test engine was a Chevrolet 5 litre V-8, modified for single cylinder operation. Piston and ring assembly friction has been determined under motoring conditions with and without compression as well as firing. Friction measurements have been made with SAE 30 and 50 grade oils at different temperatures. Boundary friction has been observed especially near top and bottom dead centers. To date the technique has been used only for low speed engine operation.
CitationUras, H. and Patterson, D., "Measurement of Piston and Ring Assembly Friction Instantaneous IMEP Method," SAE Technical Paper 830416, 1983, https://doi.org/10.4271/830416.
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