<VV> Hot vs. Cold plugs...

[Sethracer at aol.com]

In a message dated 4/13/2009 9:25:15 PM Pacific Daylight Time,  
rusecular at yahoo.com writes:

Those  ratings - "hot" and "cold" - mean simply this: a plug becomes very 
hot in an engine, so we say it's a hot-running plug - or just hot. Another  
plug doesn't reach such a high temperature, so we say it's a  
cold-running plug - or just cold...

...The main  difference between hot-running and cold-running plugs is the 
length  of the insulator nose...

...Fouling due to a too-cold plug is  much better than pre-ignition due 
to a too-hot  plug...





Another notable fact. The right ignition system can fire a too-cold  plug 
pretty well, covering up a lot of "sins".  As Tony mentions, it  is better to 
err on the cold side when choosing plugs. 
 
Seth  Emerson

C's the Day! - Corvair, Camaro, Corvette



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