DIS Explainations

[Pete Datcuk]

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  Think of the two spark plugs as two resistors in series.  Their =
resistance adds, but the wattage of each will be different, the plug =
with the higher resistance consuming more wattage (ie watts =3D current =
x resistance squared).  If one of the plugs doesn't arc, then the =
circuit is not completed, and the other plug will also not fire.

Pete Datcuk
Mechanical Engineer
Sewell, NJ
'87 Fiero, soon to be Northstar'ed :-)
'67 Jeep Commando, to be risen from the dead ;-)


-----Original Message-----
From:	Michael Baxter=20
Sent:	Sunday, March 22, 1998 2:47 AM
To:	Blind.Copy.Receiver at compuserve.com
Subject:	Re: DIS Explainations

John Hess <johnhess at cris.com> writes:

>> Actually, you can have a spark in a vacuum!
<<

Air is an insulator. The more air molecules (denser), the better =
insulator
it makes. A good example, just because they've been discussed on the =
list
before, is WWII airplanes. Their magnetos were pressurized to keep the
ignition energy under control at high altitudes. Without the
pressurization, the engines would start to misfire at 18,000-20,000 ft.

High altitude piston engine airplanes today still have pressurized
magnetos.

I can offer no clues as to why the waste spark only consumes 20-30% of
the spark energy in a DIS ignition system that fires two plugs at once.


 -- Michael Baxter, MBaxter at Compuserve.com
 http://ourworld.compuserve.com/homepages/MBaxter
 From Reno, NV USA on 21-Mar-1998
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