how do you know how many rpms your engine has?

Such as a weedeater.

7 answers
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Jul 27, 2011. 2:28 PMlemonie says:

Why does it matter to you?

L
Jul 27, 2011. 9:25 PMlemonie says:

If you want to use it for something, the speed will be affected by the load you put on it.
The engine might be 11000 RPM unloaded at full throttle, but you're unlikely to get that while it's doing work.

L
Jul 27, 2011. 6:30 AMsteveastrouk says:
Measure it, with a reflecting tachometer.

Steve
Jul 27, 2011. 1:22 PMsteveastrouk says:
Like this:
http://www.demon-tweeks.co.uk/Product.do?method=view&n=1658&g=0&p=36630&utm_source=Google&utm_medium=Base&utm_campaign=Motorsport
Steve
Jul 27, 2011. 8:33 AMrickharris says:
You may find details on a label. Measuring it with a tachometer as Steve suggests.

Most small weed eater motors are direct drive and will be doing 3000 to 12000 RPM.

i find several references with a Google search.

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