Posted by FBH44 on January 22, 2015 at 02:08:37 from (64.85.217.186):
In Reply to: spark plugs posted by William Eccles - Jardine on January 21, 2015 at 15:42:42:
Here's some information I pulled together some time ago, if this copies correctly;
2014 Autolite Spark Plug catalog Heat Range Chart page 4-5
18MM thread size 1/2” reach 7/8” hex HOT rating 388 Standard resistor plug 3116 ‘Power-Tip’ Non-Resistor plug 386 Standard resistor plug • [gap] • [gap] 373 Standard Non-Resistor plug COLD rating
Each step up equals a 70º – 120º increase in spark plug tip temperature. Self-cleaning zone is 500°C to 850°C tip temperature. IF TOO HOT = Possible severe engine damage, pre-ignition, detonation with racing / high performance engines. . IF TOO COLD = Possible fouling, possible mis-firing, but no engine damage.
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