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Wed May 25, 2005 8:57 pm

What is the difference? I live in a cool climate but do not drive the car when it is cold.

Thanks!

Karl

Thu May 26, 2005 5:53 pm

Hi Karl,
You can try a search onn the internet for "Spark plug heat range" and get many informative websites.
Or try:
http://www.ngksparkplugs.com/techinfo/spark_plugs/overviewp2.asp?nav=31000&country=US
Eric&Barb

Thu May 26, 2005 6:08 pm

Manufacturers recommended heat ranges suit all but extreme racing use. Little to be gained otherwise. 8)

Fri May 27, 2005 9:52 am

I see 2 Bosch plugs mentioned for type 1 engines W8AC and W7AC. I run the W8AC, but also live in a cooler climate. What determines which of these 2 plugs to run?

Fri May 27, 2005 10:26 am

Plug is not climate related, but rather is determined by your engine characteristics. Back in the day, the adage was "hot engine-cold plug"
and viceversa. In other words if you are fouling plugs (black/sooty)
go to a hotter plug if you can find one. If, on the other hand,you are
burning up plugs (white/cracked electrode porcelain) go cooler.
In most cases the standard plug should be fine if everything else is
up to snuff.

Fri May 27, 2005 10:55 am

iowegian wrote: In most cases the standard plug should be fine if everything else is
up to snuff. So which one is standard? Hot or Cold?

Fri May 27, 2005 11:41 am

Bosch W8AC would be "standard". I think smaller number is colder, but not sure of Bosch's system of numbering. (I think NGK is the opposite)

Fri May 27, 2005 4:34 pm

thanks

Wed Jun 01, 2005 2:55 pm

iowegian wrote: Bosch W8AC would be "standard". I think smaller number is colder, but not sure of Bosch's system of numbering. (I think NGK is the opposite)

Correct, the higher the Bosch plug #, the hotter the heat-range, and NGK is the opposite, the lower the #, the hotter the plug.