E : Thread reach (3/4", 19mm)
ES: Standard 3/4" thread reach, 2.5 mm centre electrode.
It is all here:
http://www.ngksparkplugs.com/techinfo/spark_plugs/faq/faqcode.asp?nav=31200&country=US
Some very good info in the FAQ section of sparkplugs.
http://www.ngksparkplugs.com/techinfo/spark_plugs/faq/index.asp?nav=31200&country=US
Like "for every 75 -100 added horsepower, drop 1 heat range".
I guess I don't have to worry about that. I'll be lucky to get 30+
horsepower from my mods.
Also NGK lists the B6ES plugs for all year 1600's and
BPR5ES for all 2000's.
So, Greg you are already running 1 range colder than recommended!! ;-)
Daryl
> then, out of rabid curiosity, what does the ES stand for?
>
> Toby
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