mx5mia píše:My Mazda handbook lists 2 NGK plugs as OK to use in the Miata. One is the BKR5E-11, and the other is the BKR6E-11. Let me explain the difference.
The BKR5E-11 is the hotter running of the 2 plugs. Now do not confuse the "heat range" of a plug by thinking this is telling you how hot the Spark is. The spark will be the same from all plugs regardless of heat range.
The spark plug heat range basically is to tell you how well they keep themselves clean, specifically the white insulator around the center electrode.
The BKR5E-11 is the hotter running plug for people who do not push their car very hard. The tip of the plug stays hotter for easy city type driving, so the tip of the plug stays clean enough to fire reliably.
The BKR6E-11 is a "colder" running heat range, for people who regularly rev the motor high, OR who do a lot of highway driving. The consistant high speed highway driving keeps the top hot and clean. This "cooler" plug transfers more combustion heat to the head of the motor so the coolant can take it away. The NGK web page also suggests this cooler plug to sustained highway driving.
I drive about 50 miles a day commuting for work on 4-lane highways. I had been using the hotter "5" heat range spark plug, but when I had my oil analyzed I showed a problem of high Nitration. This can be caused by excessive heat in the combustion chamber. So I recently switched to the cooler operating BKR6E-11 spark plugs, and my engine is really running super. It seems to be even running better than before, but maybe it is just my imagination.
But I am anxious to see if it helped the Nitration situation I am concerned with. It should help.
And anything that helps a high performance engine run cooler is a PLUS in my book.
If you do a lot of city driving, and rarely rev it to the limit, the BKR5E-11 is probably best for you. But if you do a lot of 4 lane commuting, I suggest you try the NGK, BKR6E-11. My friend and I are both running the "6" right now and are very happy with them.
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