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Old 03-22-2004, 01:34 AM
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maxxmopar maxxmopar is offline
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Question spark plug heat ranges?

Whats the differance for hot and cold plugs.Edelbrock recomends N12yc champion plugs for there heads. Does any one know why, its way colder then a stock 318 plug
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Old 03-22-2004, 10:44 AM
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I will look it up today at work but I think a N14YC is stock 318. So that is only 1 heat range colder.
The reason they are recommending a range colder is that most people are using higher compression etc. So 1 range colder is a starting point. Go colder if required. Look for the thread from Hustlestuff and you will see some good info. I forget the name of the thread.



M.S.
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Old 03-22-2004, 11:54 AM
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The Champion N12YC is stock for the 318, 340 and 360. That's why they recommended it. N is a 3/8 reach, 12 is the heat range, Y is an extended tip, and C is a copper core. They have 14mm threads. Unless your running a race car, just stick with those. We run as cold as a 7 Champion in our race cars.
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Old 03-22-2004, 03:39 PM
coolcarz coolcarz is offline
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cold plugs disapates the heat faster, better for substained high speeds, nos etc... hotter plugs do not disapate the heat fast , better for town driving, bad gas, wont foul as much because it stays hotter longer to burn off the carbon, oil etc.... edl is not so much recommending a heat range, but the size you'll need..
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Old 03-23-2004, 02:10 PM
jelsr jelsr is offline
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Just an FYI on the heat range issue. It is primarily the length of the ceramic from the tip to the shell of the plug. The cold plugs have a very short insulator length which allows the heat to be absorbed by the shell which is in contact with the water cooled head relatively quickly and the hot plug will have a longer insulator which takes longer to pass the heat off to the metal and thus runs "hotter". Oversimplified, but that's the basics. Obviously aluminum or cast iron heads will affect this to an extent.
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