[Farmall] Oliver Cletrac HG Question

[Jim Hudson]

The polarity of an electrical spark, either positive or negative, and its
effects on spark plug electrode erosion has long been known, but has had
little effect on spark plug life in the relatively low performance engines
of the past. However, in the later, high performance, normally aspirated and
turbocharged engines where cylinder temperature and pressure are much
higher, the adverse effects of constant polarity are becoming more
prevalent.
   Look at this picture  http://www.dansmc.com/polarity.jpg

----- Original Message ----- 
From: <soffiler at myeastern.com>
To: "Farmall/IHC mailing list" <farmall at lists.antique-tractor.com>
Sent: Friday, June 17, 2005 12:49 PM
Subject: Re: [Farmall] Oliver Cletrac HG Question


> OK, Jim.  What does that mean?  The explanation I provided
> is in error, or, the magnetos of the time had more energy
> than the battery ignitions and thus cared less about
> polarity?
>
> Steve O.
>
>
> From: "Jim Becker" <jim.becker at verizon.net>
> To: "Farmall/IHC mailing list"
> <farmall at lists.antique-tractor.com>
> Subject: Re: [Farmall] Oliver Cletrac HG Question
> Date: Fri, 17 Jun 2005 10:18:10 -0500
>
> ----- Original Message Follows -----
> > The rotating magnet magnetos (like the H-4 and J-4 for
> > example) alternate  polarity of the spark with each
> > firing.  Two plugs always get a positive  spark while the
> > other 2 always get a negative.
> >
> > Jim Becker        jim.becker at verizon.net
> >
> > ----- Original Message ----- 
> > From: <soffiler at myeastern.com>
> > To: "Farmall/IHC mailing list"
> > <farmall at lists.antique-tractor.com> Sent: Friday, June 17,
> > 2005 8:39 AM Subject: Re: [Farmall] Oliver Cletrac HG
> > Question
> >
> >
> >
> > > (2)  You find "distributorless" ignitions on
> > > modern automobiles that often use one coil to fire two
> > > plugs simulaneously.  One of the sparks will be
> > > "backward" which goes against the principles described
> > > above.  However it works fine simply because modern
> > > ignition systems have vastly more power than the systems
> > used on old tractors.) >
> > > Steve O.
> >
> >
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