Figs. 4,5,6 N.A.C.A. Technical Note No. 634 T.C. 90° T.C. 90° Indicator at cylinder wall; 1,500 r.p.m. Similar conditions, with 3-inch tube length. Figure 4.- Effect of a connecting passage on the recorded pressure. … 500 r.p.m., with mild knock. 500 r.p.m., with severe knock. Figure 5.- Cylinder pressure records. 0 .01 .02 .03 0 .01 .02 .03 Time, sec. Time, sec. Figure 6.- Pressure in fuel-injection line. f
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