Ignition coil problems

[Fnord]

I've wired up a car ignition coil according to the diagram found here: http://www.spudfiles.com/forums/viewtopic.php?t=1982&
The problem is that instead of arcing across the gap it just slowly drains the battery.
I'm using a 9v, because I haven't really heard anyone say how much juice these things need to function.
The capacitor is rated for 3300uf @ 35v.
Is the voltage or amperage to low or is it possible I have a dead coil? Could really use some advice .

[Pete Zaria]

I've never tried to wire up an ignition coil as in that diagram.

However, I can tell you that a disposable camera flash circuit discharging through an automotive relay and ignition coil produces some huge, fat sparks. Might want to give that a try. You can go to most drug stores that have a photo developing counter and ask for a few used disposable cameras, "for a science project", and they'll usually hand them over. A relay costs $10 new, or probably free from a junkyard...

Peace,
Pete Zaria.

[SpudBlaster15]

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[Fnord]

Shouldn't I take the bulb out first?
Also, am I just trying to discharge the raw voltage from the capacitor into the coil or does it go though a transformer before it hits the flash bulb?

I currently have 5 flash boards laying around so I guess I can stand to do some trial and error

[Pete Zaria]

You're just using the board to charge the cap, and dumping the cap into the ignition coil. I've always used a relay, but SpudBlaster generally knows what he's talking about, so maybe try it both ways and see which works better?

Peace,
Pete Zaria.

[SpudBlaster15]

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[Fnord]

Thanks for the help everyone, it turns out the coil was just bad. I just found and wired up a new coil with a 9volt and that gave me a small spark but at least I know what my problem is now.

and of course, I couldn't resist shocking myself a few times
9 volt dont have much kick, but tomorrow I'll wire up a flashboard for it (dont plan on shocking myself with it then).