one coil / cylinder

[Jim Steck]

>To tell you the truth, I do not see any advantage of one coil per 
>cylinder over one coil per two cylinders.  The exception being 
>extremly high RPM (10000+) motors.  The proposals to date 
>have all involved much extra hardware and software complexity to 
>impliment.  What justifies this?  (Don't take that wrong.  I do not see
>how it is justified and I was wondering how the folks who are for it see
>things)  I must give it one thing:  It looks really sharp!  Not to mention
>you can put the coil almost right on the plug to minimise RF emisions 
>and power lose to the plug.  But anyway, were's the beef?

Spark plugs wear faster when they're not firing a charge . . . not important
unless you're trying to built a 100,000 between tune-ups engine.  I can also
cause problems in turbocharged engines with lots of cam overlap.  There can be
enough charge in the cylinder at the end of the exhaust cycle to fire . . . and
then burn back into the intake.

-Jim Steck
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