I am questioning your assertion that "combustion is strictly the pervue
of how hot the spark is." I contend that that it is necessary to
increase the fuel to air ratio on a cold engine because the engine is not
imparting enough heat to the mix to create a combustible mix regardless
of the heat range of the plug. Therefore, engine temperature has a
direct effect on combustion.

I agree with your contention that mechanical clearances in the engine are
designed around a certain operating temperature. If the engine is
operating above or below the design temperature, thermal expansion rates
of the materials in the engine will result in clearances that are
different than the design criteria.

Short Wave Sportfishing wrote:

On Tue, 24 Feb 2004 02:36:53 GMT, Jim Kelly wrote:

If this were true, there would be no need for a choke
on a carbed engine.

Huh?

What does choking an engine (limiting the air in the fuel mixture for
a quicker start) have to do with hot plugs?

Just curious.

Later,

Tom
S. Woodstock, CT
----------

Basic Fishing Program:

10 - Fish
20 - Eat
30 - Sleep
40 - Goto 10