On the other hand, there is an enormous amount of mutual product testing being done, and this enables plug manufacturers to offer accurate cross-brand conversion charts. However, it should be understood that the equivalents are not exact. When plug maker-A's chart shows "equivalents" from make...
https://www.briskusa.com/spark_plug_...at_range_chart the stock Champion RERX4ZWYPB plug has a heat range 1 step colder than NGK 94201 (SILZGR8B8S) It would be better if the NGK was actually a 9 heat range to at least match the Champion 4 range One heat range step increases the...
That means that an old style ignition ballast resistor of .6ohm with 12v will draw 10amp for going THROUGH the engine spark plug, due to .6+.4 ohm in circuit, as 1.2 ohms total. The Champion spark plug internal 4kohm resistor is removable from top, as then zero ohms with coppe...