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Re: new coil - basic theory

To: Barney Gaylord <barneymg@ntsource.com>
Subject: Re: new coil - basic theory
From: ccrobins <ccrobins@ktc.com>
Date: Tue, 18 Aug 1998 11:23:03 -0500
Hi Barney,

  Just a coupla points (or more),

  Electron current when the plug is firing is actually from the plug
thru the coil secondary and condenser to ground.  The plug sees the
condenser as a small battery until it is discharged.  

  This talk about condensers in Electronic Ignitions (EI):  I've seen
several kinds of EIs.  In the early transistor type the transistor
replaced the points as the current switch.  The points triggered the
transistor.  The condenser was connected across the transistor to
ground.  In the CD ignitions, the condenser (in the ignition) is charged
up to around 400 volts and discharged thru the coil by a SCR.  In the
MSD, a several-hundred volt pulse train is directed thru the coil. 
Obviously, there's an RC circuit forming that pulse train, so there's a
condenser alright.

  Yer right about the ringing.  The spark is gone by the time the first
oscillation is over.

  I think all this discussion arises beause a few guys are
misinterpreting some waveforms.  I sure wish Dan would scan in that
entire Ignition Tech treatise.

  CR



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