champions numbering system has hot plugs with the higher #,i.e.L87Y is a hot
plug used in a stock TR3. L82Y is a colder plug that works well with 10-1
compression. The old race plugs- L66Y was a hot plug; L61Y the cold plug
with L64Y in the middle.
I think NGk plugs use an opposite numbering system.
Bruce
----- Original Message -----
From: "Jim" <britbits@tiu.net>
To: "Barr, Scott" <sbarr@mccarty-law.com>
Cc: <fot@Autox.Team.Net>
Sent: Tuesday, October 26, 2004 9:48 AM
Subject: RE: Interesting message
> Scott,
>
> I haven't looked for any online explanations for plug ratings, but I can
> give a thumbnail answer.
>
> In proper operation, a spark plug is not supposed to ignite the fuel-air
> mix until it "sparks". In an ideal situation the flame is started at just
> the optimum time and progresses quickly.
>
> What can happen is that if it's a "hotter" plug than the application needs
> then the ceramic and the electrodes get hot enough to ignite the mix
> prematurely, acting like the glow plug in a diesel.
>
> How do you make a spark plug cooler (at time of manufacture, of course)??
> The spark plug is cooled by heat transfer from the ceramic to the metal
> portion that threads into the cylinder head. So by changing the geometry
> of the plug ceramic the manufacturers can tweak how quickly the plug cools
> - in a relative sense- or how much heat they retain between firing cycles.
>
> If you could cross section a "hot" plug you'd see the ceramic is a long
> thin cone with the contact point to the metal far up the spark plug body.
> A "cooler" plug has more ceramic and contacts down closer to the electrode
> end.
>
> In the car, if the plug is too hot you'll tend to get pre-ignition under
> extreme conditions (pinging/pinking) which will do all kinds of neat
> damage. If the plug is too cool it won't burn off the carbon buildup and
> eventually foul. A perfect plug is one that is cool enough to not ping
> under full load, but good enough to keep firing under cooler conditions.
>
> HTH
>
>
> Cheers,
>
> Jim
> Dallas TX
>
> > <<the best race plug ever made.>>
> >
> > OK, I'll bite -- so what makes a plug a good "race plug"? The spark
plugs
> > (like a large, but decreasing, number of parts of our cars) have always
> > been a mystery to me. What makes one hotter and one cooler? What do
you
> > see on the end of the plug that tells you whether you need hotter or
> > cooler? Are there any recommended reading resources out there?
> >
> > Scott (B.)
> >
> > -----Original Message-----
> > From: owner-fot@Autox.Team.Net [mailto:owner-fot@Autox.Team.Net]On
> > Behalf Of Ted Schumacher
> > Sent: Tuesday, October 26, 2004 7:16 AM
> > To: Herald948@aol.com
> > Cc: fot@Autox.Team.Net
> > Subject: Re: Interesting message
> >
> >
> > Andy, we still have Champion gold paladium plugs in stock. Probably the
> > best race plug ever made. Plug numbers end in "G" to denote the gold
> > paladium. A real race only plug. Ted
> >
> > Herald948@aol.com wrote:
|