This graph shows a representative system. One thing to note is the pressure wave will take a finite amount of time, regardless of RPM but the cycle time varies due to changes in RPM. You have to light the mixture earlier to get the peak pulse to happen at the right position of the crank, thus the need for centrifugal advance. Variable valve timing falls into the same issue, you want to open the valves earlier at higher RPM's. Modern engines get a flat torque curve by varying both the valve timing and ignition timing.
The big natural gas engines I work on are optimum pressure around 15 degrees ATDC, I would imagine most engines are about the same time so the most torque can be applied to the crankshaft.
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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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