Stimpy - FSO
Serious Thumper
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SuzukisSavage Int'l Division
Posts: 1203
Germany - formerly SD, SoCal
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Yeah, I might have explained my self a bit ambiguously,
so yes of course, air density is a key factor to millage,
this is the atmospheric-molecular equivalent of efficiency by
punching a smaller hole through (aka: aerodynamics).
However oxygen concentration is as important a factor as
air density or power to weight ratio; most automobiles (and modern
bikes) have oxygen sensors built right into the fuel injection system,
older tech carb bikes, like the savage do not, that's why we adjust
and re-jet, simply "giving it less gas" won't do.
At higher elevations oxygen molecules are less abundant,
therefore combustion could become too rich.
I use to sometimes run around the Yuma area and the savage
felt like it was running on pure NOS continuously, just amazing!
this area is dry, very hot and quite close to sea level and also
has several large oxygen sources close by, this is a bit like
how ram-air turbochargers work.
In San Diego one could feel slight changes in combustion behavior
and MPGs between warm summer days and wet winter rides
and also when climbing, lets say, up to alpine (2000ft elev) or
Big Bear lake (+6000ft elev).
Years later living at over 7000ft elevation these same carb settings
where a complete mess and engine efficiency was lagging, specially
on wet days, so I rejeted this way making my mix a lot thinner,
problem solved.
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