Re: Champion J6J or J6C

[foot_doctor]

Remember Tetraethyl Lead? It was the additive used to improve the octain of our fuels many yeas ago. One of the consequences of it’s use was the precipitation of lead balls on the spark plug electodes. If enough of them gathered, they shorted the gap. No Spark. OMC and Champion Spark Plug company did companion research on the malady and came up with the cut back ground electrode that provided 50% less area for the Lead Balls to congregate on, and allowed the incoming fuel charge to sweep the more exposed gap clean with each piston stroke. The J-gap plugs were produced in a limited number of heat ranges, and were specifically designed for use in 2-stroke engines. They were not meant to provide any performance advantage. The Y-gap plugs referred to earlier were originated for the Chevrolets 283 cu. in. engines and were L12Y. They present some unique advantages.. They ran hotter at slow speeds, and cooler at high speeds. We were fortunate that Champion made the colder plugs with the Y-gaps for our use, as they were proveably faster in some engines if we were able to keep the ground electrodes from being closed by contact with the piston domes. This stuff is fun, isn’t it? R.T.