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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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