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Quote from: JamesH on March 16, 2023, 01:16:31 AMThe key point here is that higher performance engines require a ‘colder’ plug to help disperse the resultant heat from combustion faster. The ceramic insulators on ‘colder’ plugs are generally smaller, allowing faster heat dispersion. In the Denso terminology, the bigger the number the colder the plug. So an X-22 is a ‘hotter’ plug compared with the X-24 which is ‘colder’ in Denso terminology. I agree James but with the nature of interpretation I describe the colder plug as having larger insulation for more dispersion in surface area from plug tip to plug wall and then onward to the cylinder head casting. (Attachment Link) It is a bit semantics though as so many describe in opposite direction as I've found over the years, champions I always have to reference the numbers as it just doesn't stick in my mind like NGK
The key point here is that higher performance engines require a ‘colder’ plug to help disperse the resultant heat from combustion faster. The ceramic insulators on ‘colder’ plugs are generally smaller, allowing faster heat dispersion. In the Denso terminology, the bigger the number the colder the plug. So an X-22 is a ‘hotter’ plug compared with the X-24 which is ‘colder’ in Denso terminology.
I was under the impression that colder plugs had higher number than hotter plugs. So an X24ES plug would be colder not hotter. As it happens it's recommended by NGK to go a step colder when using Ethanol so the X24ES would be better if that's the case.
Quote from: Oddjob on March 15, 2023, 09:39:15 PMI was under the impression that colder plugs had higher number than hotter plugs. So an X24ES plug would be colder not hotter. As it happens it's recommended by NGK to go a step colder when using Ethanol so the X24ES would be better if that's the case. I have been using D8 in my 500,and 200, the 500 runs well, ordered 6 X24 to try,
32 thou John, that's a little wide, pretty sure they should be 25 thou or something like.