After a lot off speculation about my coils dwell time i decided it was time to put the theory to the test. First i measured the coil-packs primairy resistance: both coils have 0.9 Ohm pri.

After that i measured the voltage across the coil- and GND (using the wire from v3 to coil als shunt). Surprising results!

Coil saturation time turned out to be ~9.8 mS, with a supplied dwell period of 10.4 mS. Battery voltage was 14.63 V [Scopeshot of the experiment]

How can this be ???

Well as it turns out modern coils are designed to almost never saturate, the above experiment coild have killed the coil.

Therefore i strongly suggest not to try the above experiment with modern type (below 3 Ohm primairy resistance) coils

See also:

* DummyIgnition page for tips how to safely determane coil dwell values.

* [page that inspired me to try it in the first place]

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