[Fot] Spark Plugs

[Glenn Franco]

It is the distance the heat has to travel up the center electrode to the 
metal shell so the plug can transfer heat to the water jackets in the head.
The greater distance the hotter the plug and shorter the cooler the heat 
range of a plug.
Champion makes is easy since the higher the number the hotter the plug.
A Champion RN9YC is a cooler plug than a RN12YC.
Look in any automotive text book or the Champion manuals for the 
explanation.
Glenn

On 4/24/2015 9:11 AM, Barr, Scott via Fot wrote:
>
> OK, so here’s the stupid question of the day – what is it that makes a 
> hot plug “hotter” or a cold plug “colder”.  Is a “colder” plug more 
> resistant to absorbing heat?  And if so, why?
>
> Scott (B.)
>
> *From:*Fot [mailto:fot-bounces at autox.team.net] *On Behalf Of *Bill 
> Babcock via Fot
> *Sent:* Thursday, April 23, 2015 7:11 PM
> *To:* Robert M. Lang
> *Cc:* fot at autox.team.net
> *Subject:* Re: [Fot] Spark Plugs
>
> Why would you want to play with heat range on a dyno? There’s no 
> horsepower difference. The only function of heat range is to have the 
> porcelain at the right temperature to burn off deposits and not 
> overheat to the point that the plug electrode melts or the porcelain 
> blisters. Or at an extreme that the spark plug starts acting like a 
> glow plug. Some tracks that are very tight or that have elevation 
> changes might dictate a change to a hotter plug, or one with long open 
> straights might warrant a colder one, but once you’re in the ballpark 
> you shouldn’t have to do much.
>
>     On Apr 23, 2015, at 8:51 AM, Robert M. Lang via Fot
>     <fot at autox.team.net <mailto:fot at autox.team.net>> wrote:
>
>     Hi,
>
>     I've been using Accel 114's for the last ten or 15 years, they
>     seem to work fine. I have a collection of different temp range
>     plugs from Accel all the way from 113 through 117. I've never
>     taken the time to play on the dyno to see if there's any
>     difference changing heat range. I know = "my bad". I've never had
>     a plug fail despite the amount of internet detritus regarding the
>     quality of this brand.
>
>     In any case I was thinking about switching to NGK. My TR6 motor is
>     12:1, Webers, cam (street duration Isky Z19), header, etc.
>     Ignition is Mallory / Pertronix.
>
>     Would the NGK BP6ES or BP7ES be a better choice?
>
>     Regards,
>     rml
>     ---------------------------------------------------------------------------
>     Bob Lang              Triumph TR6!!            |  This space for rent
>     Former NER Solo Chair                          |
>     Voice:617-253-7438                             |  Cell: 339-927-4489
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