[Healeys] Champions(again)

Oudesluys coudesluijs at chello.nl
Tue Sep 29 02:09:22 MDT 2009


Rick,
You are right up to a point. When you run a high energy coil or 
electronic ignition you also have to increase the gap of the plug 
considerably, thus creating the need for a higher voltage to spark. It 
is all about energy, a stronger spark through higher voltage and/or 
longer duration. The system also needs sufficient capacity to be able to 
release the extra energy.
In the standard set up of cars I have never come accross bad plugs 
although I have heard stories enough in the past about Champion being 
lousy plugs. If things went wrong with the plugs, it was usually 
carburettor related.
Kees Oudesluijs
NL


Richard Ewald schreef:
> I am more than just a bit puzzled by this response. It does not matter if
> you have a sports coil, a stock coil or a mega coil from JC Whitney they
> will all only produce the amount of voltage necessary to ionize the gap of
> the plug.  Period.  If it only takes 10KV to ionize the gap, that is all
> that any coil will produce.  The difference between a stock coil and a high
> performance coil is how long the spark will last.  A more powerful coil will
> have a longer spark line on a scope.  That is the reason modern cars have
> such high available voltages, the spark burns longer and therefore lowers
> the emissions.  If you look at a modern car on an ignition scope, they only
> take a few thousand more volts at idle to ionize the gap and start the
> spark.  The difference is how long the spark lasts.  On a modern car the
> burn time is much longer than on an old classic car.
> Getting back to the OP, the very first tune up I ever did on an LBC was on
> my sister's '67 MGB.  The parts house sold me a new brand of plug, just came
> on the market.  NGK.  Two out of 4 were bad.  Took me an hour to figure that
> out.  finally I put the old plugs in and it ran fine.  So I went back and
> traded the No Good Kind for a set of Champions which ran fine.  Since then I
> have used NGK on many cars, but they are not bullet proof either.
>
> Rick
>
> On Mon, Sep 28, 2009 at 7:58 AM, Dave Porter <frogeye at porterscustom.com>wrote:
>
>   
>> I'll add that unless you are driving Bob Hockert's of Mike Salter's Healey,
>> I would not recommend that you use platinum plugs, of any manufacturer.
>> There is not enough voltage with stock OR sports coils to make them work
>> efficiently.
>> dave
>>     
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