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Hey guys just saw this post and wanted to clear some things up.
The BPR series will not work as they have a larger 13/16 socket size
If running a smaller .028-38" gap then drop the -11 off the plug part numbers. This will give the plugs an out of the box gap of .032" instead of the much larger .044". Keep in mind I do not recommend gapping a plug up or down more than about .008" from where it comes gapped at out of the box as the center firing and ground electrodes will not be properly aligned and can cause early plug failure as well as poor performance especially in boosted applications.
Also remember when gapping any fine wire plug to not apply any pressure to the center firing electrode as it can be easily damaged and is not warranted.
Also the use of anti-seize is NOT recommended or needed regardless of what you may have heard
Tightening torque is rediculously important! tighten to 18-21.6 ft lbs or finger tight plug 1/2 to 2/3 turn
Platinum is still not recommended for nitrous applications although it is fine for boosted applications
Iridium works extremely well for nitrous applications due to its high melting and oxidation points
I am unsure why MSD does not recommend the use of precious metal plugs. I have been on their forums and have seen where they advise not to use them but the only reasons they listed was that the plugs “burn to hot” I am unsure what they mean by this, and I can tell you that we have never had a plug come back that was damaged or failed because of an aftermarket ignition system. We have many, many racers that use MSD systems and other high power aftermarket ignitions with our iridium and also platinum plugs without issue.
I cannot see how the iridium plugs would not hold up or burn up quicker with their ignition systems, as iridium has a 2000 degree higher melting and oxidation point than standard nickel-iron alloy (commonly referred to as copper). It is also nearly twice as hard and twice as strong as nickel. All of our plugs are copper cored The ground electrode of the plug is still standard nickel-iron alloy with a taper cut that helps to un shield the flame and promote faster and more complete combustion and this is the point that will wear out first on these plugs.
Although platinum is about six times softer than iridium and also about eight times weaker it still has a much higher melting point (about 700D F) than standard nickel with a higher oxidation point. The oxidation point is what directly affects spark plug wear, this is why platinum plugs last much longer and erode away at a much slower rate than nickel iron alloy plugs.
I have also heard rumors that because of the smaller diameter the precious metal plugs use causes the tip to become so hot that it can cause pre ignition and detonation. Although the spark will be more concentrated at this smaller point to promote better spark concentration it will also cool down at a much faster rate (every time the intake valve opens and the air/fuel charge rushes in) than a larger standard 2.5mm center diameter electrode with much more mass (4 times larger).
I would also think that most any performance ignition system installed from the factory today, like the new corvettes coil on plug system for instance probably puts out just as much voltage (40-50,000) if not more than an MSD 6A system and 99 percent of these cars come equipped from the factory with iridium or platinum plugs without issue.
If you ever have any questions or need a recommendation feel free to call me at my desk at 248 926 6315 or call 877 473 6767 option 2
Brandon Peeler
Technical Support Representative
Aftermarket division
NGK Spark Plugs USA
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