Re[2]: [ihc] spark plugs

[bearbvd@xxxxxxxxxxxxxx (Greg Hermann)]

At 7:11 AM 4/23/04, ken.dunnington wrote:
>Ryan
>
>By deeper reach do you mean the electrode extends further into the
>combustion chamber or are you referring to how far back into the plug
>the ceramic insulator extends?

Reach refers to how far the tip of the electrode and insulator extends past
the end of the plug into the chamber.

Greg
>
>I ask because the second is the standard method of varying the heat
>range.  The longer the cermaic insulator(and thus the electrode), the
>hotter the plug because the heat of compression/combustion must
>"travel" further before it is dissipated.  The shorter the insulator,
>the colder the plug.
>
>I'm curious if the 85s and 303s have the electrode and ground strap
>placed differently in relation to the chamber(aside from what indexing
>provides).
>
>Ken
>
>
>...
>RM> The 303s are a shallower reach plug than the 85, the 85 has a deeper reach
>RM> and, from what I recall, all previous discussion indicated that some list
>RM> members believed that the 85 is actually the proper interchange for the
>RM> champion with a mistake happening somewhere in the works.
>...
>RM> -Ryan