It's not all that hard to build a spark gap. Just refer to any ARRL manual. Two
90-degree points separated by .050" will do the trick. There is a lot of copper
and brass plate available out there at a very reasonable cost and it won't foul
in the weather
Dave
WA3MKB
-------------- Original message --------------
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
> On Tue, 2008-04-15 at 08:14 -0500, Paul DeWitte K9OT wrote:
> > Yes automotive plugs have resistors in them to suppress the tvi. However
> > some
> small engine plugs also have resistors in them. They will have an R in the
> model. I use Champions so maybe some other brands do not have this ID.
> >
> > Paul
> The only sure check is an ohmmeter. Some lines of Champion plugs have
> air gaps in the plug body to increase the coil voltage for use in old
> engines burning oil. Most vintage tractor owners now despise Champion
> plugs as finding them fouling easily and not cleaning at all. As
> production shifts off short quality of many plugs has fallen. The raw
> material and production quality control is not good.
>
> 73, Jerry, K0CQ
>
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