Re: [EE]: Flame rectification

Interesting! So the 800 ohms is the ignition coil resistance, and the left
or right spark gaps are in series.

Harold


On Sun, December 21, 2025 6:41 pm, Bob Blick wrote:
> Followup to the ignition on a gas cooktop. Four burners, the left two
> have 800 ohms between ignition electrodes, same with the right burners.
> But no connection between left and right electrodes, and no connection to
> ground. My thought is that there are two ignition coils, one for left,
> one for right. The coils have one HV wire("positive") for a front burner,
> the other wire("negative") for a rear burner. Ground is not part of the
> coils, and is only used as a path for the spark current between two
> electrodes. Both coils are fired at the same time, driving all four spark
> electrodes. And if any electrode is shorted to ground, it only increases
> the spark for it's mate.
>
> Clever. Reminds me a bit of the ignition coil on my Miata MX-5, where
> there are two ignition coil windings in the same package, but driving
> four spark plugs. In this case alternating between the two windings,
> driving two spark plugs at a time. I had a Mustang with a similar setup,
> and it actually had half the spark plugs designated positive and the
> others negative, with different part numbers. I replaced them with plugs
> that had iridium on both the center and ground electrode. --
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