Spark plug article

[Kendog 170]

I was reading a spark plug article online. I have always use champion plug 12 heat range so never tried a hotter or colder plug. I found this interesting as different plug manufactures have different heat indexing.
Quote from article.
It is also important to note that Champion plugs use a larger number for a hotter plug while NGK plugs reference heat in the opposite direction, with hotter plugs using a lower number. So, it's important to know your spark plug manufacturer's reference numbers regarding heat range.

Just throwing this out there.

 

[4spdragtop]

Here's a NGK cross reference chart I found.

 

[Kendog 170]

Copied. Thanks

 

[Bewy]

The biggest mistake enthusiasts make is using a colder plug...when they should be going one step hotter.