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correct, you will have less pressure in the cylinders as a result of being at that altitude. the simple explanation is that there are less molecules of air to compress per volume, so you're going to see lower numbers.
ISA (International Standard Atmosphere) is 29.92 inches of mercury (or 1013.2 millibars) at 15 degrees celcius/59 farenheit at sea level. there's gotta be a reference somewhere that'll tell you approximately what ratio you should be seeing at that altitude... but 120 sounds like it should be about normal to me... the important thing is that your cylinders are even in compression, which they are!
iirc at 10000 ft the millibar level is approximately 700 or so...
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Mike - CFI, A&P Mechanic w/ I.A., Aztec driver at Island Tyme
'88 951S - zermatt silber/black - staying stock. purchased in 11-2006
'84 944 - gemini grau/tan+brown - lightly modified. purchased in 11-2001
2021 Tesla Y - to get me to work
Last edited by ERAU944; 05-13-2008 at 10:14 PM..
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