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Benson · 01-19-2022, 09:27 AM

A person can not depend on standard published heat range tables for the NGK BP5ES in this case because adapters are used.

Using the adapters adds a second "interface" ie additional threads and steel to path for heat to transfer from sparkplug to the cylinder head. This changes the heat range of the NGK BP5ES making it hotter.

01-19-2022, 09:27 AM	#17
Benson Senior Member Join Date: May 2010 Posts: 2,599	Re: Woofa Express looking for help. A person can not depend on standard published heat range tables for the NGK BP5ES in this case because adapters are used. Using the adapters adds a second "interface" ie additional threads and steel to path for heat to transfer from sparkplug to the cylinder head. This changes the heat range of the NGK BP5ES making it hotter.