Elevation and Compression?

[r3cc0s]

Trying to figure out how tired my motor is... and the guage says they are 137 respectively, however I'm at 3400 ft elevation...

does this mean the motor is in better shape than I think it is?

 

[Danosll]

I have to agree with you the first time i thought about taking elevation into account .is after rebuilding top end on a twin engine challenger . at my country house elevation approx 2000ft after running for ten hours i was pumping mid 140s. on both engines which when in city was 150+(same gauge). so when i returned home to store boat for winter everything was back to 150+psi.
hope this helps.

 

[Lumps]

I found this on a chain saw site. I assume it applies to us too
Altitude Factor
1000 .9711
2000 .9428
3000 .9151
4000 .8881
5000 .8617
6000 .8359
7000 .8106
8000 .7860