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공임
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부품비
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소요 시간
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2026. 6. 30. 작업
난이도 & 준비물
증상
What mechanical revolution is measured in "RPM"?
처리 내용
Ok, let's start from the same picture so we're on the same page: These engines are four stroke engines, which means the piston goes up and down a total of 4 times, twice up, and twice down for each cycle. So to answer your questions: Of course I do realize it stands for revolutions per minute, but revolutions of what? As you stated later, it's revolutions of the crank shaft. I assume the crank shaft, how is it calculated, is it by the crank shaft sensor? Why do some old cars that runs with a carburetor don't have the RPM meter is it for the lack of the ECU and the sensor? As for how it's measured, there are both mechanical and electrical ways to measure it. Older cars didn't have a tachometer just because they were not popular, and to limit the cost. Many older cars did have tachometers though, just mechanically driven. I'm not 100% sure where the pickoff was for this, but if I had to bet it was just a gear off the crankshaft that gets reduced to a needle movement on the dash. In the s
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