On Thu, 11 Jun 1998, Andy Kunz wrote:

> >You can, in fact, many newer autos do just that. Down side: extra wear on
> >the plugs.
>
> The other problem (more serious imho) is more wear on the HV section (coil,
> etc).  If you're running 6000 RPM, that's 12000 sparks/minute on a 'normal'
> firing setup.  24000/60 = 800 sparks/second.  Not many non-racing ignition
> systems can handle that speed AND deliver a hot spark.

Usually this time of system is implemented with multiple coils. 2 coils
(for the 'two at once' systems') and you are back down to 400 S/s per
coil. Equivalent to what the same coils could to in a 3K RPM engine.
Automotive coils are cheap (20-30 USD for something acceptable.), and many
people use one coil per plug. If your timing was up to it, that'd be my
recommendation. Plenty of spark, no HV switching to worry about.
ALSO: The marketing dept. of most of the "two at once" ignition system
companies would frown in consternation at the "extra wear" statement...
"It helps clean unburned carbon deposits off the plugs"

YMMV.

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