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How accurate is my tach? 700 1991

posted by  Don Foster on  Tue Nov 4 04:22 CST 2003
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

Keep in mind that an ordinary fluorescent light (not an incandescent light) acts as a strobe at 120-flashes per second (twice per cycle of 60-cycle AC current).

You can use a garage light as a strobe tach on your front pulley. Run the engine at speeds that are harmonics of the power line frequency, such as 1200, 1800, 2400, 3000, 3600 rpm (which are 20, 30, 40, 50, 60 revs/second) and and see if the pulley appears to stop (when illuminated by a fluorescent light).
--
Don Foster (near Cape Cod, MA)






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