would there be any benefit to running one step colder spark plugs in my car?
02-10-2005, 07:59 AM
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would there be any benefit to running one step colder spark plugs in my car?
maybe just in the summer? i spike to 21 or so psi. I have a K03 sport, i get 170 g/s at 6000 rpm, knock sensors never go above 12.5 (mV?) or so. right now im running NGK BKUR6ET with .032 gap. would there be a benefit to running one step colder plug? i know people do with a K04, im not quite in K04 range, would this be pointless?
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02-12-2005, 08:12 PM
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Actually, you got it backwards, cold plugs transfer more heat . . .
from the combustion chamber to the heads to allow the combustion chamber to run cooler, which is especially important for big turbos and other high output engines.
Hot plugs transfer less heat to the heads in order to keep the combustion chamber hotter. This is important in low octane, low compression engines that do not make much hp per liter to keep the combustion chamber between 500 and 800 degrees C--the temperatures at which a plug in a gasoline engine self-cleans yet at which the fuel does not prematurely pre-ignite/detonate.
All spark plugs have two primary purposes: ignite the fuel/air mixture and keep the combustion chamber between 500-800 degrees C regardless if they go into a model airplane, lawn mower, passenger automobile, or race car. With gasoline as the fuel, the laws of physics demand this temperature range. The more air you can to get into the engine, the hotter the combusion, and the cooler the plug needs to be to control the chamber temperature.
NGK has a nice tech info section on its website, if you want more info.
Hot plugs transfer less heat to the heads in order to keep the combustion chamber hotter. This is important in low octane, low compression engines that do not make much hp per liter to keep the combustion chamber between 500 and 800 degrees C--the temperatures at which a plug in a gasoline engine self-cleans yet at which the fuel does not prematurely pre-ignite/detonate.
All spark plugs have two primary purposes: ignite the fuel/air mixture and keep the combustion chamber between 500-800 degrees C regardless if they go into a model airplane, lawn mower, passenger automobile, or race car. With gasoline as the fuel, the laws of physics demand this temperature range. The more air you can to get into the engine, the hotter the combusion, and the cooler the plug needs to be to control the chamber temperature.
NGK has a nice tech info section on its website, if you want more info.
