REFLECTOR: Running LOP -- Climbing or Cruising

sbjknox sbjknox at earthlink.net
Fri Nov 12 16:17:49 CST 2010


No, the thread depth does not change, only the structure of the ceramic 
insulator.

Sid

----- Original Message ----- 
From: "Brent Bourgeois" <bjb3013 at yahoo.com>


The hot / cold of a plug is the measure of how much heat the plug conducts 
out of the cylinder. The thread depth (length) changes not the ceramic or 
the electrode. Search hot / cold racing plugs on the internet

Brent
N61VB
New Orleans


From: aminetech at bluefrog.com <aminetech at bluefrog.com>

Are you saying the cooler plug has a shorter center electrode? Can I file 
mine off to make them shorter? I'm planning to get some cooler plugs, but 
they won't come until next month and I really need to keep flying now.

John

From: "sbjknox" <sbjknox at earthlink.net>

>> That's interesting. I'm currently have spark plug issues and I'm
>> planning to try a cooler plug. Could I simply add a washer to my
>> existing plugs to get less reach and effectively make it cooler?
>> John

My opinion (not a fact) is just the opposite. The washer would create a
longer path for heat to flow from the plug body to the cylinder. You want a
lower heat-resistant (shorter) path from center electrode to the cyl...that
is why a colder plug will have a shorter exposed (exposed to the hot
combustion gas) center electrode insulator.

Sid Knox
Oklahoma

Velocity 173 RG N199RS
Starduster N666SK
KR2 N24TC
W7QJQ




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