On Tue, 24 Feb 2004 00:00:37 GMT, "Rich" wrote:


"Short Wave Sportfishing" wrote in message
.. .
On Mon, 23 Feb 2004 20:10:04 GMT, "Geoff 93 RRC"
wrote:

If you are looking for power and clean combustion, a hotter plug is
always the best choice

Actually, the heat range of the plug only refers to the plugs ability to
transfer heat from the plug to the head. A hot plug is one that that the
tip retains more heat, a cold plug transfers heat quickly. When driving,
the tips of the spark plugs are heated to incandescence. The heat must
travel from the tip through the shell and ultimately into the water jacket
of the cooling system. If the plug is too cold it will foul, if its too hot
you will get detonation, that is, the fuel will ignite before the timed
spark -- and you can blown a hole through the piston!

It is my understanding that a "hot" plug is aimed more towards keeping
heat available to burn off deposits quicker and help with a cleaner,
quicker burn when the fuel/air mixture is ignited. It is also my
understanding that engine manufacturers allow for a range of types of
hot to cold plugs to adjust for varying conditions like altitude,
emissions requirements and other issues.

I have adjusted plugs for hot/cold on high performance engines because
of the varying temperatures in different cylinders - all within a
range of course but all on the same engine.

Perhaps I should have said Hottest Recommended Plug?

Later,

Tom
S. Woodstock, CT
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Basic Fishing Program:

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