Re: Optical Tachometer:Different Pulley Diameters-

Posted by Rod F. on June 19, 2005 at 09:13:35 from (142.177.76.43):

In Reply to: Optical Tachometer:Different Pulley Diameters-QUES posted by Andrew H on June 18, 2005 at 16:57:12:

Hi Andrew,

First comment I will make is regarding the pulley size. From what I know, the alternator pulley, from factory will be 1/2 the circumference of the crank pulley. The alt should turn at twice the speed of the engine. This is also a reasonably accurate means of measuring speed, as Ford employed this system on the thousand series tractors for 10 years.
Second comment, or more a question, is why you would go through all this bother for no more than 50 dollars worth of parts to repair the factory setup? If you change this, you lose the factory tach and proofmeter, and just add more clutter to the dash panel. Beyond that, you may find that the electronic instruments don't care too much for the vibration, moisture, and dust they will encounter in that environment. That said, I wish you the best of luck with the conversion if you go ahead with it.

Rod

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