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Old 04-20-2013, 07:38 AM   #1
walkingbear OP
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Joined: Jun 2004
Location: Scottsdale AZ..
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83 R100 Spark plugs

What would be the best spark plugs for South west.. AZ
Cooler plug?
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Old 04-20-2013, 01:19 PM   #2
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Originally Posted by walkingbear View Post
What would be the best spark plugs for South west.. AZ
Cooler plug?
Stock plugs. Evaluate the proper heat range, as well as the mixture, by doing plug chops (google--->)

Doesn't matter where you are, the temperature in that cylinder is very close to the same. Gas and air burn at X temperature and X is a constant. The whole motor might run a lot hotter in a hot climate, less temp,. differential to the air to provide cooling.

A hotter plug literally runs hotter (center electrode). it might be desirable to burn off oil fouling in a very worn engine. I've used a hotter plug in the left lower plug of a dual plug setup because of gas and oil fouling. A cooler plug literally runs cooler and might be desirable when running bad gas and having pre-ignition problems.

You might also go hotter or cooler with various engine modifications.

The temperature of the plug is determined by the construction. The hotter plug has a longer center electrode (going back into the plug body) making a longer path for heat to get to the head and be dissipated. The colder plug has the reverse and it's center electrode cools more and more quickly.
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