NGK are good because you have a broad spread tolerance of actual heat range in 1 given heat range plug number.
There is supposedly 130* of tip temperature difference in each heat range on an NGK plug........about the same as any other maker.
Tip temperature is strictly based on the amount of insulation around electrode. Nothing more, nothing less. It's fairly easy to compare heat ranges between brands with your eyes, no cross reference chart needed.
And somebody said you don't read a Champion like an NGK.....really, how is that possible? Mixture is on the porcelain, timing is the strap and heat range is in the threads. How does that possibly change with brands?........answer, it doesn't
He is an example for you.
If you are using blown alcohol and Champions, I want to see the top of the case has 3/4 to all the way around from the ground wire buring off the coating. On an NGK, they want 3 THREADS DOWN. Do that ona Champion and it will back side pistons and all other bad stuff.
So the opposite is true. If you only take the top of the cad (or whatever plating the [censored] use) off the plug it will be too cold.
For N/A I like to see the top thread gone on a Champion. That's almost 4 on the NGK.
On top of that, the heat ranges are too wide, which some on here think is ideal. I do not.
