I know that when the gas combust it do so in millisecond. But I find it very hard to believe it goes though that entire process that fast. The piston is still a mechanical part and will add a lot of friction. So how long to it take to usually for a piston to go down and back up? I know this maybe hard so can you also give certain conditions as well or at least some type of guide to help figure this out?
math it out. we will use 3 RPM readings that will math out easily, and give a good idea of how fast things are happening at different engine speeds.
600 RPM - This is about idle speed. 600 revolutions per minute (RPM) = 10 revolutions per second (RPS). Assuming this is a 4 cycle engine, so 2 revolutions per cycle, so 5 complete cycles per second. Each cycle is 4 strokes, so 20 strokes per second. The combustion stroke takes 1/20th of a second or 50 milliseconds
3000 RPM - This is about cruise speed. 50 RPS, 25 cycles, 100 strokes. combustion stroke takes 1/100 seconds or 10 milliseconds
6000 RPM - This engine speed will be reached at wide open throttle. 100 RPS, 50 cycles, 200 strokes. combustion stroke takes 1/200 seconds or 5 milliseconds