What part of the plug is read? Is it the porcelain/ceramic insulator or the curved electrode? And what should I be looking for using 92 octane (US) gas with 15% of that stinking ethanol?
Reading A Spark Plug
Started by
croc7
, Jun 05 2019 04:35 AM
3 replies to this topic
#1
Posted 05 June 2019 - 04:35 AM
#3
Posted 05 June 2019 - 10:20 AM
With modern fuels you want a nice dark grey colour on the plug electrode. Not brown like it used to be.
#4
Posted 05 June 2019 - 06:45 PM
Thanks for the information. So based on the link to NGK and the response from Dusky, the color of the ground electrode is the part of the plug to be read and not necessarily the porcelain nose of the insulator?
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