Re: coils

Posted by dr.sportster on January 29, 2005 at 05:06:55 from (209.247.222.106):

In Reply to: coils posted by dangley on January 28, 2005 at 21:03:04:

If you run a magneto voltage output will increase with RPM so where high secondary voltage is most needed for reliable spark gap ionization the mag is able to deliver all that is required without problem.Coil and batt ignition is not so able to maintain voltage at higher RPM because the coil core is magnetized by battery [primary]current only during intervals when points are closed.When RPM increasespoints close for a shorter time.the magnetic feild of the coil now becomes weaker as the coil is less saturated with magnetism.So a better coil may help high speed running there will be no major difference at low speed.THe idea of the dual point distributor solves some of the coil saturation problem.That all being said without any increase over stock RPM range the original engineers have probably designed an ignition system worthy of firing your tractor within the normal operating speeds.Theoreticly an ignition system does not increase horsepower.

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