Yep thats how I always understood it although I cant explain the physics of why. It seems somehow with more molecules packed in there in the space (higher PSI denser air) between the plugs electrode and ground strap theres more resistance to the striking of the arc across the crowed space, but if pressure decreases and especially if it were in a vacuum, it takes less voltage potential before the arc will occur.
The arc is ionizing the air molecules right??? Im still not sure how or why but Im confident it takes more voltage across the gap to arc current as the pressure increases.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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