Originally Posted by pooleo
so you could theoretically use the +4 plugs to eleminate any need to make the spark fire a certain way....?
Perhaps this is why the +4's are claimed to be more effecient/powerful, it basically automaticly index's your plugs....?
Nah, these designs would actually be frowned upon by proponents of indexing. Their theory is that if the open side of the electrode faces the incoming air/fuel charge, the flame front will begin to spread before the it becomes slightly turbulated by the electrode post. practical in engines with machine work done if anything.
The air flow in today's engines has some real rocket science behind it without even getting into indexed plugs. Even the evaporation rate of the gas that hits the wall of the cylinders is taken into account.
If indexing had any merit in OE engines, I'd think it would be incorporated. That'd be my opinion of course.
I'm still gonna index the plugs in my truck so I can pretend to feel the difference though.