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Altitude and Compression Testing
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<blockquote data-quote="BobL" data-source="post: 1690771" data-attributes="member: 14206"><p>Don't forget atmospheric pressure varies significantly over time at the same altitude.</p><p>If you measured compression on a day when it was 1030 mbar and got 150 psi and a couple of week of so later when it was 990 mbar thats a difference of 4%, and assuming nothing else had changed you would then read only 144 psi.</p></blockquote><p></p>
[QUOTE="BobL, post: 1690771, member: 14206"] Don't forget atmospheric pressure varies significantly over time at the same altitude. If you measured compression on a day when it was 1030 mbar and got 150 psi and a couple of week of so later when it was 990 mbar thats a difference of 4%, and assuming nothing else had changed you would then read only 144 psi. [/QUOTE]
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