Ignition Only

[Axel Rietschin]

----- Original Message -----
From: "Jurgen Hartwig" <jhartwig at midsouth.rr.com>

> Aside from simplicity and reliability, is there a measureable
> advantage to running DIS vs. just dizzy, assuming, of course, both are
> ECM controlled?

A wasted spark DIS doubles the rpm limit of the ignition system since you
have twice the number of coils. A coil-per-cylinder setup pushes the limit
even higher as a given coil has to fire only once every two revs, compared
to 4 times per rev as on a V8 engine. This helps maintain powerful sparks
and decent plug gaps on high-speed, high compression engines, specially
blown ones. It's probably somewhat cheaper too, and it gives you total
freedom on the spark timing, which can be important in some special cases,
such as anti-turbo-lag systems in competition engines.

--Axel



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