Jun/Jul 2008

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SmokStak

About Capacitors

By Harry Matthews

A recent topic on the SmokStak bulletin board at http://www.smokstak.com/ brings up an item that is responsible for spark plug ignition failure -the capacitor.

I would like to offer my help to those folks who may not understand capacitors, also commonly called condensers.

First off, what is a capacitor? A capacitor consists of two metal plates separated by an insulating material, such as paper. Engine capacitors are usually two long strips of aluminum foil about an inch wide sandwiched between layers of waxed paper, then rolled up and placed in a metal case. One plate is connected to the case and the other to a lead out wire. Fine, but what does it do?

When a capacitor is connected to a voltage source, such as a battery, it acts momentarily as a closed circuit as current flows to charge the plates; negative electrons on one pla...

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