od) fai-io taken ivith bouncing pin \ Engine bentol Jso-octane + 0.12# by volume of tetraetlyl lead a) • " * AOi * • • ■ " a " M + .05* ■ • • « « o Pure bensol CD I Engine benzol 5,0 Incipient knock Compression ratio by o audibie method Figure 1.- Relation between test compression 70 60 90 ratio… … Figure 2.- Knock characteristics at different excess air, CFR motor. Mixture temperature 130 °C 80 °C Vj 35? o O •H as *> 100- * 10 'Octane g a o CO 2 / CD s & N O a Excess air^ Octane, o o I 1 ° / H6 QS i0 1,2 V* 0,6 4S 1,0 V it 10,13 11,6 13,0¥ n,S 1S,35 t*s+conditions Excess air x Air-fuel ratio…
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