Incipient knock Compression ratio by o audibie method Figure 1.- Relation between test compression 70 60 90 ratio and compression ratio at in- Bentol value cipient knock for 100-octane and over fuels. Test co fid it ion corresponds /o o. v.*-. Sup er c Hcrry 4 - method bi^-f Leaded aviation… … 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 Correspond CFR Cnq- nnefhacf. Knock, characteris*ics oU Figure 3.- Knock characteristics of Figure 4.- Testing of 87-octane 87-and-100-octane fuels fuel by DVL super- at different…
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