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Registered
Join Date: Jun 2004
Location: Rio Rancho, New Mexico
Posts: 1,325
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As a long time resident of Albuquerque at 5000 feet or greater elevation we have been dealing with the lack of oxygen as compared to sea level. The rule is 3% loss for every thousand feet above sea level. This results in a 15% loss to the effective compression ratio. For an engine rated at 10:1 compression, the loss is 15% resulting in a net compression ratio of 8.5:1. With this lower effective compression ratio the requirement for higher octane fuel is not needed. Of course when travelling to lower elevations put in higher octane fuel.
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DOUG
'76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's.
'85 911 Carrera, stock, just painted, Orient Red
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