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Old 12-17-2010, 08:52 AM
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I basically use the information here to determine what the specification (from sea level) becomes at a given altitude. At 5,000 feet (Longmont) the specification range in the F engine FSM (128 to 150) becomes 110 to 129. At 7,000' the range becomes 122 to 104.

Use the chart in that link to figure out what the range becomes at the altitude you did the compression test at, then see how your numbers compare.
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Last edited by RicardoJM; 12-17-2010 at 09:24 AM.
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Old 12-17-2010, 09:06 AM
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So I did the test at my parents house which is at 7000 ft or so. According to that chart the multiplication factor is about .813 (linear between 6500 ft and 7500 ft).

So my numbers, adjusted for altitude, are:
#1 - 141
#2 - 141
#3 - 135
#4 - 125
#5 - 135
#6 - 138

Okay, so that's not too bad.

Even if it's closer to 6500 ft, they are:
#1 - 139
#2 - 139
#3 - 133
#4 - 123
#5 - 133
#6 - 136

I feel much better now.
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Old 12-17-2010, 09:27 AM
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So what were your readings directly from the gauge? At 7,000 feet the adjusted range is 122 to 104.

Whether you adjust your readings or adjust the range and compare you actuals shouldn't matter, but I'm used to adjusting the range. It is easier for me to not have to do the math on each reading.
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Old 12-17-2010, 09:47 AM
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First post; 102-115 wet test.
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Old 12-17-2010, 09:59 AM
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Quote:
Originally Posted by RicardoJM View Post
So what were your readings directly from the gauge? At 7,000 feet the adjusted range is 122 to 104.

Whether you adjust your readings or adjust the range and compare you actuals shouldn't matter, but I'm used to adjusting the range. It is easier for me to not have to do the math on each reading.
Guys, don't make this more complicated than it needs to be. The rule of thumb is you adjust 3% for each 1,000 above sea level. So if Matt's location where the test was performed is 7,000 feet it's a 21% adjustment.

Take the gauge reading of 113 and divide it by .79 which equals 143. Thats close to being within 10% of spec which is 150 psi at sea level. If all of the cylinders are roughly within 10% of each other, then your motor is in pretty excellent condition.
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