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at that high compression I would go with a very cold plug, very high octane gas and try to keep temps low. Detonation is hard to feel but will cause the compression ring to be eaten by the engine (just gone). I am a fan of iridium plugs (bigger spark).
Chrishttp://forums.pelicanparts.com/uploa...1553539254.jpg http://forums.pelicanparts.com/uploa...1553539268.jpg The piston valve relief broke and there is no ring under there (engine ate it due to detonation) |
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NGK on it's web site has stated that the main problem with anti seize is that they have found it tends to cause people to over torque the spark plug. New spark plugs come with an anti seize material on the threads, so no additional compound should be used. Adding anti seize reduces friction and can cause stripped threads when using the original recommended torque values. They recommend reducing torque values by 30% when using anti seize paste. https://www.ngk.com/learning-center/article/522/plug-torque-settings |
If the last set of NGK plugs I bought had anti seize on the threads it was invisible.
I will say that they changed the crush washer on the plug. I found it impossible to tell how tight it should be. NGK used to state on their site, that the plating they use is an anti seize? Really? It looks like NGK has backed off on that and now are OK with anti seize, but the torque value is less. They mention 1/2 to 2/3 of a turn after the gasket touches. Now that makes sense. To all you guys putting your plugs in dry, you will be OK if you change them often, otherwise good luck IMO. |
Anti seize actually does change the plugs ability to remove heat from its body. We have seen this multiple times. I think you have understand each application. Air cooled heads act very differently with plugs. It is always assumed that plugs are torqued each time.
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I should have been more clear. I am speaking more about high performance and race Porsche 2V air cooled and race engines. These run higher head temps from running at WOT a lot more than street engines do.
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But if you feel the need to add anti seize, do it sparingly. Just a very small amount on the threads and wipe the excess off so it is only in the root of the threads. The installation of plugs starts when rebuilding the heads, making sure the threads are in good condition. Heli coiling the threads changes the temp range too, so be careful. NGK and some other brands require no additive to the threads. Plugs should always be installed using a "rubber" by hand. I still have one and use it today, I used in my F1 days. Then use a torque wrench to tighten. |
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