Spark plug

[JasB]

What does the Thermal Value (TV) of a plug mean?
more to the point, what is the effective difference between an NGK B4H (TV 95) and an NGK B6H (TV 175)?

 

[tillergirl]

http://www.ngksparkplugs.com/techinfo/spark_plugs/overviewp2.asp?nav=31000&country=US

 

[JasB]

Spot on, thanks

 

[tugboat]

Well tickle my arse with a feather, I never knew that!