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5R13-12405-BA to NGK PTR 7E-13

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Old Jun 19, 2015 | 05:40 AM
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5R13-12405-BA to NGK PTR 7E-13
I have also seen 6E. 7E is a colder plug. Is the colder plug better given we need higher octane fuel for smoother combustion?
 
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Old Jun 22, 2015 | 10:18 AM
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Yes, higher octane allows a colder plug. Not for a smooth combustion, its for a better burn to push the cylinder back down in the bore. Although too cold and it will misfire, too hot and ignition will pre detonate...
 
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