[Spridgets] Spark plugs and altitude

JLC breton48 at live.com
Mon Mar 23 13:55:02 MST 2009


Good site, thanks!   Gives  me a good insight on what to do and why,  when
you go to high altitude.  The plugs are not fouling, but I still think I'll
try one grade cooler, which was the original plug temp setting for that
engine.

 

JLC

 

Weslake-Monza 1330 wrote:

 

 

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

 

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).


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