A microprocessor-based knock measuring system has been developed and tested for use in fuel rating and octane rating increase tests. Tests have been conducted with eight knock raters, and this has shown inter-rater and intra-rater variability. It has also been shown that there is no absolute standard by which knock can be measured. However, it has been argued that, as long as a consistent measuring system is used, comparative fuel testing can be undertaken with greater repeatability by using the microprocessor-based knock detector.
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