curprev22:1022:10, 12 August 2018 71.85.11.191talk 4,175 bytes+3 →Description: Changed "compression ratio" to "compression pressure". Compression ratio is a fixed number, comparing a cylinder's swept volume to it's unswept volume. Compression pressure will change based on air density (altitude, temperature...), engine rpm, engine temperature, and other factors.undoTags: Mobile editMobile web edit