performance number

[pər′fȯr·məns ‚nəm·bər] (engineering) One of a series of numbers (constituting the PN, or performance-number, scale) used to convert fuel antiknock values in terms of a reference fuel into an index which is an indication of relative engine performance; used mostly to rate aviation gasolines with octane values greater than 100.

performance number

The “knock” rating of an engine. It is expressed as an octane when this figure is below 100. See octane rating.

单词	performance number
释义	performance number performance number [pər′fȯr·məns ‚nəm·bər] (engineering) One of a series of numbers (constituting the PN, or performance-number, scale) used to convert fuel antiknock values in terms of a reference fuel into an index which is an indication of relative engine performance; used mostly to rate aviation gasolines with octane values greater than 100. performance number The “knock” rating of an engine. It is expressed as an octane when this figure is below 100. See octane rating.
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