Posted by FBH44 on April 25, 2014 at 14:02:07 from (64.85.215.174):
In Reply to: spark plugs for an H posted by Rat in Can on April 25, 2014 at 11:25:49:
Some time ago I got a 2014 Autolite Spark Plug catalog mailed to me. The Heat Range Chart on page 4-5 lists these plugs in descending order of hotness.
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 = 70º – 120º increase in spark plug tip temperature.
Self-cleaning zone = 500°C to 850°C tip temperature.
TOO HOT = Possible severe engine damage, pre-ignition, detonation with racing / high performance engines. . TOO COLD = Possible fouling, possible mis-firing, but no engine damage.
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