Re: Checking RPM's

Posted by RayP(MI) on May 07, 2005 at 09:01:24 from (64.25.199.4):

In Reply to: Checking RPM's posted by Andrew Z on May 07, 2005 at 07:02:45:

I have a "passive" rpm meter - uses a wire sticking out of a plastic housing about the size of a chewing tobacco container. As the wire is extended, it vibrates with the motor in question - and the calibrated dial reads out the rpm based on the amount of wire extended. Suprisingly accurate. Checked it once against a calibrated electronic frequency counter - if I remember right, I probably made an inductive pickup coil out of a couple turns of wire around one of the plug wires. These devices are usually used on single cylinder lawnmower type engines, but if you could find the right place on a multi-cylinder it should also work.

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