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I have been thinking, and it occurred to me that I AM at a high altitude (5000 feet). So when doing a compression test I have to have this in mind since air is less dense. I found the altitude compensation factors and checked again and my compression isn't bad at all
Altitude Factor
500 0.987
1500 0.960
2500 0.933
3500 0.907
4500 0.880
5500 0.853
6500 0.826
7500 0.800
8500 0.773
From what I have seen, my engine (d15b7) should have a compression of about 180 psi at sea level. Now I have taken the 4500 feet compensation (0.880) and multiplied it by that. And I get 158.4 psi. So at my altitude I want to get around that number. My last compression test gave 150-160 at 5000 feet, while engine was hot and at WOT. SO this means compression is good. Even taking my lowest number (150 psi high altitude) and converting it with the altitude correction factor 0.880 I still get a pretty good number (170.4 psi at sea level).
Am I right?
Now this make me think of a new question. In higher altitude since it gives me less compression (actually not compression, less air density), would it give me less power and mpg?
I am still thinking of increasing compression ratio should it help? What should I look for in increasing compression ratio in high altitude?
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