I found this "heat range" chart on the Denso site.
But it doesn't show which way is hot or cold (left to right = hot or cold ?)
But it doesn't show which way is hot or cold (left to right = hot or cold ?)
Spark Plug Heat range Chart
- Thread starter Ken Valkyrie
- Start date
Here is the NGK chart.
OP
OP
Thanks Guys, both great charts & info
OP
OP
Here's a couple more plug heat range charts.
Last edited: