the lead- gave trends similar to those shown in figure 8, which ing points of the card. Apparently, rate of pressure is for the 50-percent chamber. As the engine speed rise and knock do not vary together, inasmuch as the increases, the velocitj of air flow in the passage in- rates of pressure rise… … Engine speed, r.p.m. Figure 8—Effect of speed on compression pressure and combustion characteristics. Fuel consumption, 3.0 X 10-' lb./cycle; 12 percent excess air; cylinder head as shown in figure 3 (a); 50-percent chamber; compression ratio, 13.5; N. A. C. A. 7A fuel pump and L3A fuel valve;…
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