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spark gap

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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spark gap

Unread postAuthor: Major Collins » Wed Apr 13, 2011 10:57 pm

on a hybrid the the spark gap has to be smaller in order for it to work right?
if you have a continuous spark does the spark gap still have to be smaller?

if your spark gap for a continuous spark is still small, your chances of igniting fuel air mixture is still higher right?
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 14, 2011 4:53 am

The greater the mix number, the smaller a spark gap needs to be (because the fuel air mix is getting denser). Depending on how energetic your ignitor is, you can get away with smaller gaps. For example for a lighter piezo, even with a 0.1mm gap you can't ignite much further past 15x. If you were using a stun gun, you can ignite much higher for the same gap.
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Unread postAuthor: Major Collins » Thu Apr 14, 2011 5:06 am

in the long run a smaller gap will always be better , got it and so a continuous spark can light higher mixture with the same size gap got it , all clarified :)
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Unread postAuthor: Crna Legija » Thu Apr 14, 2011 5:14 am

No it cant, if its not strong enough it wont mater if you have it going for 1sec or 1hr. you need a spark that is hot enough ignite with 1 or two clicks, the only thing good about continuous arc is if you have a bad mixed air/fuel mix.
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Unread postAuthor: wyz2285 » Thu Apr 14, 2011 5:36 am

If the mix is good enough, one spark will fire it, my experience.
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Unread postAuthor: Major Collins » Thu Apr 14, 2011 10:15 am

well it sounds like all it needs is attention to detail and precision. By the way if i were to make two spark gaps can they be both the same size or do they have to be halved from the original size?,for example 1 spark gap at 1mm changed into 2 spark gaps at 1mm
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Unread postAuthor: Labtecpower » Thu Apr 14, 2011 10:21 am

Depends on the power of the ignition. I would say you have to halve them.
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Unread postAuthor: Crna Legija » Thu Apr 14, 2011 10:26 am

depends, what are you going to use to make teh spark? If you use a car igniton coil you can run two 1mm gap at 15x sure, but a pezo no way. You would need one 0.1mm gap.
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Unread postAuthor: Major Collins » Thu Apr 14, 2011 2:11 pm

oh so in return of the amount of sparks is the amount of power ,i see all good
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