09-15-2016, 06:09 PM
I stumbled into a single cylinder engine tachometer, which looks identical to this one but mine says it was made by Dixson:
https://www.amazon.com/Wireless-Tachomet...tachometer
I figured I'd test it on my 2-stroke Lawn-Boy and got about 3000-RPM.
But then I got to thinking, it doesn't have a 2-stroke/4-stroke switch. So how does it know which I'm measuring? A 2-stroke fires the spark every revolution, where a 4-stroke fires every other revolution.
So I'd think there would be a conversion necessary if it is just telling me the # of sparks per minute? Because you can't get to RPM from sparks per minute w/o knowing the strokes.
Am I overthinking this? Maybe it isn't reading spark but something else?
https://www.amazon.com/Wireless-Tachomet...tachometer
I figured I'd test it on my 2-stroke Lawn-Boy and got about 3000-RPM.
But then I got to thinking, it doesn't have a 2-stroke/4-stroke switch. So how does it know which I'm measuring? A 2-stroke fires the spark every revolution, where a 4-stroke fires every other revolution.
So I'd think there would be a conversion necessary if it is just telling me the # of sparks per minute? Because you can't get to RPM from sparks per minute w/o knowing the strokes.
Am I overthinking this? Maybe it isn't reading spark but something else?