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Re: [FOT] ignition systems

To: Larry Young <cartravel@pobox.com>
Subject: Re: [FOT] ignition systems
From: "Jack W. Drews" <vinttr4@geneseo.net>
Date: Sun, 01 Oct 2006 12:04:54 -0500
Oh, that's pretty clever!!! Never thought of that approach. Thanks!

At 09:41 AM 10/1/2006, Larry Young wrote:
>My only experience is with Pertronix.  I don't find these difficult 
>to diagnose.  Most of us old geezers that grew up with points 
>automatically assume the Ignitor has failed when we have ignition 
>problems.  The first thing they do is put points back in.  My first 
>test is to attach a known good spark plug directly to the 
>coil.  This removes the rotor, cap, wires and spark plug from the 
>equation. If I get a spark on all cylinders, then there is nothing 
>wrong with the ignitor, so you can go on to check cap, rotor, wires 
>and spark plug.  If you get a spark on some, but not all cylinders, 
>then the magnetic ring is bad.  If you get no sparks, then the 
>Ignitor is not working.  I recently used this approach on my TR250 
>to determine that one magnet in the magnetic ring was flipped over 
>so the wrong pole was facing outward.  This is the way it came out 
>of the box.  I suppose you could also have a bad coil.  My 
>experience is that coils seldom fail, but you could swap that out 
>with a good one to confirm.
>Larry Young
>
>Jack W. Drews wrote:
>
>>I only have experience with three different electronic ignition 
>>systems, so I'm not an expert on them. The one thing they have is 
>>common, for me as a racer / user, is that when something goes 
>>wrong, it is hard to find what it is and usually impossible to fix, 
>>unless I have  whole redundant system along with me. If I have a 
>>conventional system, I can fix it with a continuity tester and a 
>>small supply of relatively cheap parts -- it's got to be the wire 
>>coming to the system, or the cap, rotor, points, condenser, or coil.
>>
>>I used an electronic ignition system in m race car for ten years 
>>and it worked okay, but when it did fail I had to put in a 
>>conventional distributor to find out if the brain box was bad. 
>>Likewise last week when my TR6 suddenly quit running and coasted to 
>>a stop -- I had no idea if the Prtronix quit or something else happened.
>>
>>uncle jack
>
>
>



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