Compression change with altitude

[awinquist]

How much does altitude affect compression? I'm at 2300 feet above sea level and my motor is showing 135/135. Would that number go up if you went down in attitude and by how much?

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[fischer550]

PSI goes down about 5-6 psi every 1,000 ft of elevation. if you brought your engine down to sea level, compression should be a bit under 150psi if it is at 135psi at 2300 ft.

 

[awinquist]

Perfect thanks!

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[bird]

...so now you have me searching the inter webs for the lowest point on earth(max PSI!), it's the Dead Sea. The Dead Sea is 34% salt, which would increase the buoyancy of your ski. Maybe we should have flat water competitions there? Think of how much more power you'd be making along with the additional buoyant force to launch the ski higher! Double back flips for dayz....! Don't forget the salt away.

 

[be_lain]

Depends on temp and daily barometric pressure as well. Pressure variations with altitude are nonlinear. There are online calculators you can use to estimate it

 

[orangefinger]

u could not load the pump....