At 3,000 RPM, how long does it take each valve to open and close in a small gas engine?

To determine how long it takes for each valve to open and close at 3,000 RPM, we need to consider the rotational speed of the engine and how it translates into valve timing.

At 3,000 RPM (rotations per minute), the engine completes 3,000 revolutions in one minute. Since a four-stroke engine requires two revolutions to complete one full cycle (intake, compression, power, and exhaust), we divide the total RPM by 2 to find the number of engine cycles per minute. In this case, 3,000 RPM results in 1,500 complete cycles per minute.

To find the time for one complete cycle, we take one minute (60 seconds) and divide it by the number of cycles per minute:

60 seconds / 1,500 cycles = 0.04 seconds per cycle.

Each valve (intake and exhaust) will open and close during this cycle. Given that each valve typically has an opening and closing duration, and since each cycle comprises both events, the time taken for just the opening or closing of a single valve can be considered to occur within that complete cycle. If we distribute the opening and closing events evenly over the cycle, each event would take