[Farmall] Oliver Cletrac HG Question

[Howard Weeks]

Another twist to this subject has to do with the temp of the center
electrode
relative to the ground electrode.  Electrons will flow (arc) from a heated
object
better than it will from a colder object.  That is why the filaments in
tubes have to
be heated in order to get the tube to work.  Supposedly, that center
electrode runs
much hotter than the ground electrode.  Think I read that in some older
Farmall manual.

Howard
----- Original Message -----
From: <soffiler at myeastern.com>
To: "Farmall/IHC mailing list" <farmall at lists.antique-tractor.com>
Sent: Friday, June 17, 2005 2:42 PM
Subject: Re: [Farmall] Oliver Cletrac HG Question


> Hi Jim:
>
> Yes, I *was* implying that all systems prior to modern
> high-energy systems (high-energy ignitions predate
> distributorless) put a negative voltage to the center
> electrode.  However, as you pointed out, that is in error.
> It's more correct to say all BATTERY systems.  Sorry about
> that.
>
> It has been empirically observed that a coil hooked backward
> results in poorer running, and the only thing I can think of
> to explain this is the reversed polarity creating a weaker
> spark because it is jumping TO the center electrode rather
> than FROM it.  And if it wasn't a problem on magneto systems
> (just like it isn't a problem on distributorless) that must
> mean the battery systems were somewhat marginal whereas the
> magnetos had excess capacity... what do you think?
>
> Steve O.
>
>
> From: "Jim Becker" <jim.becker at verizon.net>
>
> > Nothing wrong with your explanation, except the
> > implication that all systems  prior to the modern
> > distributorless systems were designed to put a negative
> > voltage to the center spark plug electrode.
> >
> > The lower compression ratios and narrower spark plug gaps
> > of the time  required less voltage to fire than typical
> > modern engines.
> >
> > Jim Becker        jim.becker at verizon.net
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