Re: sparkplug basics (index mark?)

["Ryan Schuermann" <rts@nol.net>]

and if you have a 16v which uses triple ground elecrtrodes i suppose 
you'd want one - electrode pointing between the two exhaust valves

  ?
 
Ryan
hrm my Green rocco didnt pass idle emissions test (no Cat.) guess 
i'll try a bottle of Sur-Pass or whatever....
308 hc's, 220 was passing...

> On Fri, 18 Dec 1998 12:52:26 -0600 John Van Vuren <veedublu@wirural.net>
> writes:
> 
> >First of all, this is not really important for most of our cars...  
> >the
> >index mark (sometimes you have to make them yourself) corresponds with
> >where the side electrode is...  the idea is to not have the side
> >electrode shielding the spark from the combustion chamber...   in other
> >words, on an 8v VW, it would be best to have the side electrode nearest
> >the radiator so the spark was more open to the majority of the
> >combustion chamber.
> 
> 
> This is true. I know that most of the drag racers do this religiously.
> What they do is index the side electrode to be inline with the center
> electrode and the intake valve. 
> 
> 	L I    X
> 
> 
> The "L" represents the side electrode.
> The "I" represents the center electrode.
> The "X" represents the intake valve.
> 
> 
> This can get really complicated which I wont go into boring details but
> that's the basic way to index a plug. The main goal is to get the spark
> plug side electrode out of the way of the in comming fuel/air charge.
> HTH!!
> 
> 
>               Shawn Meze
> 86' Jetta GLi           82' Scirocco GTi
> The Fastest, Quickest, Cleanest and
> best looking Scirocco in all of San Diego!
> http://www.Geocities.com/MotorCity/Speedway/1308/index.htm
> 
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