I copied this from the site I have listed below it. It is a pretty good
description of a points type ignition. It is on a VW site.....but the
principles are no different on any points type ignition.
Gt
The ignition coil is really two coils intertwined, with the leads to one
going to the spark plug, and the leads to the other going to the
points. Your points close, and a magnetic field builds up. They must stay
closed long enough (they DWELL closed for a bit!) to energize
the field. They open, and the field collapses. The inductance of the
collaspsing field does not care which of the two intermingled coils
created it -- it dumps into both, but because of the way they are wound, it
mostly dumps into the spark-plug side. Enough gets into the
points-side, though, that there will be a spark across them as well. The
condensor is there to absorb this. Without a condensor, your
ignition will work fine, but your points will very rapidly pit because of
the arcing, and may weld themselves together. Alway replace the
condensor with the points -- it is more common that a poor condensor has
caused the points to fail than the points wearing on their own.
http://www.type2.com/library/electrip/ignwor.htm
-----Original Message-----
From: owner-oletrucks@autox.team.net
[mailto:owner-oletrucks@autox.team.net]On Behalf Of Perry Smith
Sent: Saturday, September 16, 2000 7:49 AM
To: MKlepp4335@cs.com; old-chevy-truck@egroups.com;
oletrucks@autox.team.net
Subject: Re: [oletrucks] Condensor & points Question
Mike, check the condition of the internal ground wire in the dist. They can
cause all kinds of problems if they break or are loose, and I know from
personal axperence that it can fry the points.
Perry Smith
58 GMC Fleetside
Phoenix Arizona
>From: MKlepp4335@cs.com
>Reply-To: MKlepp4335@cs.com
>To: old-chevy-truck@egroups.com, oletrucks@autox.team.net
>Subject: [oletrucks] Condensor & points Question
>Date: Fri, 15 Sep 2000 18:26:32 EDT
>
>Please tell me if I'm wrong - I always thought that the condenser prevented
>sparking (arcing) across the points, it even says that in the AD shop
>manual.
> My FLAPS guy says, no. The points are supposed to spark, that's the way
>they work.
>Who's right here?
>I put new points and condenser in my '48 and within a few minutes of run
>time, they had evidence of arcing. I spun the engine with the cap off and
>the spark at the points looked like the spark the plugs should have. (I'm
>still chasing the poor running condition.) Thanks as always.
>Mike Klepp
>'48 3100
>Wichita Falls, TX
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
_________________________________________________________________________
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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