Combustion time in the engine cylinder and its effect on engine performance (1928)
NASA Technical Reports Server (NTRS) · leaf 10
y for this case is 45.7 per cent. If combustion required 100° of crank travel and a spark advance of 30° was stiU retained, the curves would appear as in Figure 13 and the average efficiency would be only 35.7 per cent. So far as this analysis is concerned the reduction or increase in the… … " 60' 40° ' 20' Q' 20' 40' BO' Crank position, degrees from cenfer Fig. 13 SPARK ADVANCE It is quite evident that 30° is too much spark advance for the rapid combustion shown in Figure 12 and not enough for the slow combustion shown in Figure 13. These two figures demonstrate clearly the need for a…
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