Naturally aspirated engines are understood to lose approximately 3% of their rated horsepower per 1,000’ of elevation. Additionally, air compressors are acting on a lower density suction air supply. When an air compressor draws in air as part of its intake process, it draws a fixed volume of air. If the air density is lower, fewer air molecules are drawn in with this air into the compressor. This results in a smaller volume of compressed air and less air is delivered during each compression cycle.
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