California
Super Star Member
- Joined
- Jan 22, 2004
- Messages
- 14,674
- Location
- An hour north of San Francisco
- Tractor
- Yanmar YM240 Yanmar YM186D
Positive ground was common on British cars and some American brands. Maybe early Ford? I think it was considered technically superior because while a spark plug can have only one center, insulated electrode that erodes rapidly, a Positive Ground system can use spark plugs that erode multiple side electrodes instead of the center one. So they last longer before the spark gap is too great. Ok that's something I was told 50 years ago. Anybody have better information?