Senior Tech Team
Join Date: Apr 2012
Location: Yerington, Nevada
Re: Spark Plug Upgrade
I stated that all spark plugs are not forced to fire from negative to positive, as YOU stated as fact some dissertations of misleading info further up in this chain. It is proven fact that not all spark plugs are fed with current run paths of negative to positive movements. You made the statement about the only one direction firing polarity, I DIDN'T.
Now, nobody took me up on the J gapping? I am verklempt. J gapping was done to unshroud the positive electrode in a spark plug, to allow for the spark kernel to hit more fuel molecules, by removing most of the flat end of the negative electrode. Simply done, the part of the negative electrode that was obscuring the center electrode was cut back for most of the diameter of the center electrode. The remaining negative electrode bar made it look like the letter J. This was usually good for a tenth or so per run, but, electrode wear increased exponentially, because the spark occurred on one edge of the center electrode only, not all around the round edge of the electrode, because there was no electrode left to randomly fire spark around the center electrode diameter.
Most older racers drove the cars on the street, then raced on weekends. They'd leave the plugs alone for the week, then, before the race, cut the negatives into J gaps, race, and then put another set of plugs in for two weeks later, the next race. We see quite a selection of spark plugs today that are J gapped, but in today's plugs, there are more than 1 negative electrode that are J designed. E3's have three, the first two negative electrode plugs I mentioned above were dual J gap, and on, and on. We even use a 2 bar variation of them to negative electrode NGK racer plugs in the Yamaha M7 1,000 cc inline MotoGP 4 stroke engines of today. We make an easily tunable 290 to 385 or so horsepower in those engines, in a minimum 285 pounds weight motorcycle, and the engine is docile enough to ride the bike back and forth to work, the market, Sunday ride.
The only spark plugs that aren't negative electroded, are the NGK BUHX, and Champion UL17V and UL19V Surface Gap plugs, they have literally NO negative electrode, the spark runs between a center electrode and the hole on the plug body. I just saw an ad for those Surface Gap plugs being touted for 4 stroke auto engines, that isn't what they like, Surface Gap plugs are for electronic CDI ignitions, and two stroke outboard engines. Seems anybody in the spark plug business will say, over hype advertize, and/or do anything to sell product, who cares if it works, or, not.