Install two coils increases gas mileage.

in the plane, it's because the engine has two spark plugs per cylinder. the idea is redundancy. ther are some autos with two plugs per cylinder, too. the parallel coils will not like ly help and will probably cause failure of one of the modules if not both. sammmm, commercial, instrument, single engine land

Would expect the twin coils might offer a bit of a load problem to a stock ignition control module. However, the concept of modifying the stock module [or designing one] to fire the two coils in reasonably close sequence might have merit. A good design would adjust the firing closer together as rpm increases. Whether the particular engine would benefit from a second spark just after ignition has begun, dunno. A separate plug fired after a short delay was used in the 1936 american motors nash engine...

this really is not going to do much if anything

better to think of vaporizing your gasoline before it gets to the cylinder ... here you'll see real benefits

the spark is the spark that gets burning going...if the second coil sparked a spark in another location with another plug...that would do something...but again, vaporize your fuel more completely is the way to get your moneys worth out of your ever decreasing in size gas can.

gasoline is supposed to go to the 3 dollar a gallon point this summer..finally... it is well documented that the pollution kings will not slow down without someone clubbing them on the head a few times...

hey that's america hey that's stupidity

reply to

snipped-for-privacy@whitehouse.gov

Perhaps. Back when Delta [of Grand Junction] solid state ignitions were replacing Judson magnetos in hot rods, there was a specialty ignition system invented by a radar engineer that used a radar style pulse transformer and an oscillator style exciter for spark. The ignition signal from the points was used merely to gate and time the multiple sparks that this system generated. In a theoretical perfect ignition sequence, one optimal spark would start a flame front which would propagate perfectly across the combustion area. In a practical engine, additional sparks even in the same location may be able to start additional ignitions that reduce unburned fuel.

resistance does not change much.

You can have twice the current flow in Primary circuit when put two coil in parallel (and most likely It will dange the ignition control module because of excessive current flow and over heated unless you add another ignition control module for the second coil) but how do you get twice the current flow through the spark plug and plug wire in a cylinder? About the Ohms law: You don't have double secondary voltage here, the total resistance (spark plug, ignition secondary wire and two secondary coil wiring) does not change much So the total current flow will remain almost the same.

Best Regards.

Tree

And somewhere around the time of 01/18/2004 02:16, the world stopped and listened as Tibur Waltson contributed the following to humanity:

You may want to re-post this in rec.autos.tech. From what you are describing, your car has a distributor ignition system. In addition to replacing the plugs, have you checked/replaced the wires between the distributor and coil/plugs? Have you checked the distributor cap and rotor? All these things can contribute to a weak spark. Have the plugs been gapped properly? An over gapped plug will cause a miss if the coil can't put out the voltage to jump the gap. A gap that is too narrow will cause a loss of power.