Then while googling Ign 1A coils .....this comes up.
https://www.diyautotune.com/product/ign-1a-race-coil/
These sellers still making BS claims.
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Minimum voltage output (no load, at recommended dwell): 40,000 volts
Output energy: 103 mJ
Spark duration: 2.9 ms
Primary resistance: 0.5 ohms (not directly measurable)
Primary inductance: 4.8 mH (not directly measurable)
Secondary resistance: 8,500 ohms
Secondary inductance: 22.5 H
Turns ratio: 71.1
Maximum current: 19 amps
Maximum battery voltage: 17 volts
Nominal dwell: 3.0 ms
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Minimum voltage....it's actually maximum voltage, determined by turns ratio and primary clamp voltage.
103mJ?......stored or delivered to plug?
Duration?...2.9 msec???......that's determined by cylinder pressure, AFR and plug gap.It gets shorter as cylinder pressure increases.
Pri resistance and inductance....E = 0.5 LI squared so at 19A it can store 866mJ.....or can it?........no it can't.
Turns ratio 71........so with a 350v primary clamp it can make 24Kv, with a 400v primary clamp can make 28.5Kv....but no more. In order to make 40Kv you need a 563v primary clamp which is a bit too high to protect the primary switching transistor.Normally 400v max.
Nominal dwell 3mS.....time constant for the coil = L/R= 4.8mH /0.5 ohms= 9.6ms
http://www.electronics-tutorials.ws/ind ... cuits.html
With 0.5 ohm, max I at 13v = 26A
With a 9.6 mS dwell you'll get 63% of Imax
With 3msec dwell you might get 30% of Imax or about 9A.
Energy stored at 9A = 0.5 LI squared or 194mJ
Max current 19A?
Based on an Imax of 26A , that's 73%, then you'd need to dwell it for a bit more than 10 mSec (more than 3 times the nominal dwell) to do it.
So it's pretty much snake oil designed to sell to those who've got no idea.
Now how many mistakes did I make here?