Posted by Phil Doolittle on May 06, 2008 at 05:57:56 from (71.120.53.111):
In Reply to: battery question posted by farm M on May 05, 2008 at 19:51:31:
In Positive Ground Direct Current ( DC ) systems Regardless of voltage spark ignition systems in internal combustion engines the spark starts from the outer metal electrode, not the center electrode. The electrical erossion due to the spark eats away the steel. This is the part you adjust for the spark gap. When early spark plugs were made you could disassemble them to clean the center electrode and file it FLAT. This aided the intensity of the spark hence ignition. Further improvements in sparking plugs were to seal the porcelin to the center steel rod as well as to the threaded base. As newer harder alloys were developed the internal rod is connected to harder metals such as platinum. Certain metals carry electrical current better(lower resistence). Copper is better a conductor then steel,but is too soft and melts at a lower temp. then steel as an example. SO, the center TIP only is now the harder better conductor in preminum plugs. AND yes this allows the Polarity of the NEGATIVE ground system to start sparking at the center electrode to the outer carbon steel body. BE SURE YOU FOLLOW THE POLARITY ON THE SPARK COIL IN THE CIRCUIT: ALSO helps the intensity of the Spark. Check the 50 TIPS on this site for FORD "N" tractors for further explaination. These early discoveries were by Edison & his good friend Henry Ford.
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