jstadwater has a demo of running the plasma spark in a compressed chamber. He describes the setup and result.

I obtained a cylinder combustion test plate from a friend of mine that bolts onto a cylinder head and allows simulation of combustion chamber pressures. I did this test at 2,300 rpm and only one of eight plugs setup to fire plasma. I pressurized this chamber at 100 – 110 psi, using VERY dry air from the dryer system my painter uses to paint cars. Because we all know what happens with plasma and moisture! As the pressure increases, so does the size of the plasma! I thought compression would decrease the effect, but I guess not now.

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