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Spark Plug heat range chart question


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Allow me to demonstrate my ignorance.  I recently received a few sets of  NKG BPR5ES from EPay and I did Pay more than I'm use to paying for plugs. They are basically out of stock everywhere but they are the plugs I've had good luck with since I bought the 2002


In the chart below, I'm wondering if Hotter means the plugs themselves are hotter or  they are intended for a hotter cylinder head? 


Probably I'm reading too much into it.


Spark Plug heat conversions made easy! | Opie Oils in the UK}

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The plug heat range allows you to select the right temperature needed to keep the plug clean. Self-cleaning zone is about 450 degrees C.

Too cold and the plug fowls. Too hot and it blisters.

Doesn't have much to do with the actual combustion temperature...just the plug.

BTW: I found the slightly hotter NGK BP5 works best in my stock engine (8.3 : 1 CR).



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Thanks guys. I suspected it had to do w/ the plug tip temperature. 


I often times realize all the holes in my knowledge about "modern" non VW aicooled cars. Every car I've had since I graduated from high school in 1980 has been an air cooled VW.  A lot of things to help the 2002 run and operate it's best I just never had to think about or never learned. 


With my VW's over the years, if they start and get me where I need to go I haven't really tinkered or tuned much on motors.  I did pull the 1200cc single port engine from my Karmann Ghia and build a 1600cc dual port with an extractor type exhaust many years ago but that 's about it. 





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