Which spark plug is hotter?
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
41-906 I'd imagine. I know of one company that has the heat range ratings in reverse, NGK. In other words the higher the number the colder the plug. The number you should be looking for with these plugs is probably the last number. So, traditionally, this plug should be hotter the higher the number.
Thread Starter
Racer
Joined: Mar 2014
Posts: 267
Likes: 24
From: Montevideo, Uruguay
41-906 I'd imagine. I know of one company that has the heat range ratings in reverse, NGK. In other words the higher the number the colder the plug. The number you should be looking for with these plugs is probably the last number. So, traditionally, this plug should be hotter the higher the number.
Thanks
