$72.94 shipped

[bsell]

so, this isn't going to answer your question at all. sorry.

but i've been through airframe powerplant training (a piston engine is a piston engine), and my instructor said what all the master techs say, and that's that a spark plug isn't gonna do any of the above. this guy's been in the aircraft industry over 20 years, and working on his own cars for... ****, the guy's pretty old, i'll say upwards of forty. those plugs aren't any better than stock.

We fixed many a Subaru's rough running condition in the mid-late 80's by swapping out the Champion spark plugs that came original with NGK's. They were identical heat ranges and all that but for some reason, the engines loved the NGK's and hated the Champions.

I've seen the opposite in American cars, the Champions were the ticket and the NGK's had to go.

I would say stick with whatever works best for your engine. If you feel like paying 3/4 of $100 to test it out, then go for it.

Brian

[bsell]

The key to good spark plug is sharp edge on electrodes. When you buy a new plug, you will see that the new plug got a good sharp edge whereas the one you took out of the car is already rounded off. This is the reason why we have to change plugs.

Nowdays, we have new cars where the first spark plug change is at 100,000 miles. So you figured... well how did they do that? The simplest way to do this is make a spark plug that wears exceptionally so that they always have a sharp edge. Of course, you can't just rely on this... you do have to beef up the ignition system to handle the worse condition the spark plug get while providing good emission and economy.

That is the reason why these specialty plugs comes in... because the way they wear down... instead of a rounded off copper electrodes... they had some special metals... most common back then was platinum... platinum always protected and because of small ignition point.. and the reliability of platinum metal. it doesn't 'round' off.

I 'liked' the folks who came back after a tune-up to say they lost 1-2 miles per gallon as a result of the tune-up. Of course I checked the plugs/gaps and all of the other tune-up settings to ensure they were at factory spec but the 'worn' condition gave those few owners better mpg. Go figure.

Brian