[Amc-list] ignitions coils

[Ken Ames <ameskg@xxxxxxxxx>]

One would have to assume exhaust gas has higher resistance than the compressed
fuel/air. Higher compressions need more spark to jump the gap. Air is an
insulator compared to vacuum. Some aircraft ignition systems need to pressurized
to keep the spark going to the plugs at higher altitudes.

Ken 


Quoting Tom Jennings <tomj@xxxxxxx>:

> 
> David Crooks wrote:
> 
> > Actually this isn't true...
> > Almost all distributor-less ignition systems (used on most new cars)
> > have two plugs connected to each coil.  The cylinder on the compression
> > stroke will have a lower resistance, and will get most of the spark,  
> > while the
> > cylinder at the top of the exhaust stroke will get a weak spark.
> 
> Oh, sorry!! I didnt know about the different-pressure behavior of the 
> spark gap. In open air (eg. both gaps at same pressure) one will tend to 
> hog. My bad!
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