Abstract
A method of estimating the volumetric efficiency of an engine by using a piezo-electric pressure transducer to measure the compression pressure during a non-firing engine cycle is described and the results obtained are compared with those derived from a direct measurement of air flow. The results produced by the two techniques agree to within ±3% at speeds up to 2500 rpm and are in good agreement with those obtained from an infra-red exhaust gas analysis when the engine was firing.
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