Check out he pashen discharge curves: http://en.wikipedia.org/wiki/File:Paschen_Curves.PNG and you will see that spark length is heavily dependent on the gas composition and pressure. higher pressure means shorter spark at same voltage, you won't get a 12mm spark in high pressure H2
Discharging through 2 spark plugs in parallel will not work either as the resistance drops massively as soon as a plasma channel forms diverting all current to one spark plug or other but not both. Connecting the sparkplugs in series might work but the driving circuit won't handle it as the reactor will need to be at a voltage half way between the two outputs from the sparking circuit. Unless you have a lot of additional complications with high voltage isolation capable floating power supplies. However powering the circuit with a well insulated battery might work. On 30 May 2012 19:25, ecat builder <ecatbuil...@gmail.com> wrote: > A quick followup on spark plugs.. I think I found what I was looking for.. > A small, cheap, and simple spark gap igniter that takes 5V and produces > 1/2" sparks. Less than $20 shipped. > > http://www.sparkfun.com/products/11218 > > Skip to 10:45 on the video to see it working. > Would be strong enough to drive two spark plugs.. > > Thoughts? > - Brad > >
