[Spridgets] Spark plugs and altitude

[WeslakeMonza1330 at aol.com]

Looks like Ron is correct and I'm wrong because NGK say the same thing as  
Ron.  My excuse is that I live a long way from mountains....
 
_http://www.ngksparkplugs.com/tech_support/spark_plugs/p4.asp?mode=nml_ 
(http://www.ngksparkplugs.com/tech_support/spark_plugs/p4.asp?mode=nml) 


 
That said if the plugs don't foul don't go to a hotter heat range.  If  they 
are fouling I'd still go a range at a time.  On the NGK web page they  advise 
how much the heat range changes per grade though how you work out the  chamber 
temps I didn't find.
 
A factor on whether or not you need to change grades will depend on how  
close or not you are running to the optimium range for that grade.  An NGK6  is 
already a fairly warm plug (I have NGK 8s in my road car).
 
Weslake-Monza 1330