w muller

Does anyone know how much high altitude affects a compression test? Say I had 120 lbs of compression at sea level, how much would I have at 7000 ft. elevation? Would it be a measurable amount of difference?

IndianRvrShiver

Difference will be negligible!

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2003 AC F5 (Jr's Dec 07 SOTM & 2008 SOTY)
2003 AC F7 EFI SP (April 06 SOTM)
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coloradoman25

couple pounds at most in my experience. I go from 110 to 105 on one of my sleds but thats all. And I think that has more to do with the gauge than anything.

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Co Springs Co
1999 Powder Special 700 1500 miles
1999 Powder Special RIP
2003.5 Mountain Cat 900 Mod Sled
1998ish zr600 In the mad scientists garage getting some new guts and mods...Should be interestin.

BskidooC

what we see up here at 10,000 feet it a huge difference...if you got about 140 at sea level you wil get about 120 up here...

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when hell freezes over ill ride there to

Skligmund

There should be no difference, but the method used by everybody for a compression check shows a difference. If one were to use the aviation way of doing it, there would be no difference shown either.

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1997 Polaris Indy 700 RMK - Twin SLP pipes, EGT gauges -- "Fukengruven"
1997 Polaris Indy Trail RMK 488 - Stock -- "Yard Sale"
1980 Polaris TX-L 340 - Stock

mark31

your way too smart for everyone on here maybe you should try another site. Your name speaks for yourself we know what your about just read the paper everyday.