Originally Posted by engineermike
I was expressing that at higher boost levels, the ignition is more likely to break up. I've been is high is 24 psi on an sbc, and had to pay close attention to plug gap, wire condition, etc. Never had the problem at low boost levels. I had always surmised that it takes more voltage or a smaller gap to get a good spark across denser air. That would mean that the resistance is higher/conductance lower.
You confused me by using the term resistance. It is infinite until it's not.
You mean dielectric breakdown voltage. It does go up with pressure (unless you're near a hard vacuum) but it is more strongly related to things in the air that can be ionized (like gasoline). I understand the point you're trying make.
If all you eco guys are gapping your plugs down, maybe you should consider a higher energy ignition to begin with.