Abstract
Full throttle acceleration is generally regarded as a single driving condition most prone to knock in manual transmission cars. However, we had found in a field survey of knocks that knocks occurred frequently not only during full throttle acceleration but also during part throttle acceleration. We planned to study the influence of manifold vacuum on the octane number requirements of four Japanese passenger cars and on road octane number characteristics of four fuels in these cars.It is found that the octane number requirements at part throttle of 51mmHg manifold vacuum are approximately equal to or higher than those at full throttle, depending on the reference fuel types used. Another finding of importance in this study is that the road octane number characteristics of fuels at 51mmHg manifold vacuum are not necessarily the same as at full throttle.
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