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#21 | |
![]() Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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"Rodder" is correct. There are a lot of fake NGK and Denso plugs sold on the Internet. Solution: buy NGK and Denso from legit retailers of those brands.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
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#22 |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Yep! Hib is correct about "hotter vs. colder" spark plug rating. But, far as the arc itself goes, it is true too that the amount of GAP will affect the voltage necessary before current will jump the gap, and the resistance combination of the plug wires and plug's internal resistor (if any) will affect the follow-on current (heat) of the arc itself.
The diagram* is a little confusing. Heat range of the chamber and heat (type) of the corresponding spark plug are opposite. Chamber temperature range increases with engine load and RPM. So, low speeds and low power demands = low chamber temps which require a hotter plug to burn off fouling, and visa versa. See attached from Denso site:
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry Last edited by Paul Workman; 11-06-2020 at 08:32 AM. |
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