Originally Posted by theweavman
I believe one of the reasons you may often now find more than one spark plug per cylinder is due in part to the manufactures trying to improve on fuel economy to meet govt mandates.... Having additional spark plugs, give a more complete burn of the fuel air mixture in each cylinder, which should produce better combustion, thus improving gas milage and performance.... Chrysler is not the only company using multiple spark plugs per cylinder
That's a similar reason that my airplane has two plugs per cylinder - to help with more complete fuel burn. That and to have backups in case one set goes out. No place to pull over in the sky if something goes wrong.
When you've got a 360 cubic inch four cylinder, that's a lotta gas to burn!
I personally think that two plugs per cylinder is a fine idea, albeit a bit spendy when you have to replace them.