Re: Using a Sirometer

Posted by mhmalcolm on November 19, 2005 at 03:45:47 from (66.66.107.166):

In Reply to: Using a Sirometer posted by Gene Davis (Ga.) on November 18, 2005 at 16:09:54:

It is very simple to use. When you have the unit placed on the engine, dial out the wire reed until it starts vibrating. Keep dialing it out until the sweep of the reed is at it's widest arc and then starts to reduce. Dial back to the widest arc and read the dial. That reading will be your true RPM. These are very accurate once you master the technique.

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