Winter colors '19 Alberta,Canada - Page 2 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #11 of 15 (permalink) Old 10-08-2019, 10:40 AM
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"too cold"... but our air is less dense so we getting better mileage
Not to be a nit picker, but cold air is more dense.

Beautiful country up there. Too bad you can't ride year round.

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post #12 of 15 (permalink) Old 10-08-2019, 02:08 PM Thread Starter
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Originally Posted by Gitbox View Post
Not to be a nit picker, but cold air is more dense.

Beautiful country up there. Too bad you can't ride year round.
Hmmm yes I could be wrong, I would like to invite the experts to chime in, in this case we are comparing our 1000m high altitude to lower close to sea level altitude air. Also I am interested about the effect on FJR naturally aspirated engine and getting less oxygen due to thinner air ?

Google on air density:
Density is proportional to pressure. Increase the pressure and more molecules are pushed into a volume so it gets heavier. Higher in the atmosphere it gets colder but density is lower because there is less pressure pushing the molecules together.

Density is also proportional to average weight of the gas molecules. The ratios of the gasses in air varies a little, particularly the proportion of water vapour which can range from almost zero up to a several percent at the ground in the tropics. “Wet” air will have a slightly lower density than dry air since water molecules are lighter that nitrogen and oxygen molecules. This is a small effect but can be important in meteorology where we have enormous volumes of air.

These are important effects but where the pressure and air composition are roughly THE SAME, like when you open the door of the refrigerator, cold air will be denser.

Airplanes take off when the air passing over their wings creates enough lift — lift greater than the aircraft's weight. That moment is determined by, among other things, the air's density. Air is denser at sea level where there's greater atmospheric pressure. It's also denser in colder conditions; a cold molecule takes up less space than a warmer one. ( confusing )
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post #13 of 15 (permalink) Old 10-08-2019, 09:33 PM
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The ECU compensates, no worries.

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post #14 of 15 (permalink) Old 10-08-2019, 10:03 PM
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The ECU can't compensate for that barn door V-stream windshield topped with an X-creen and my side panels in the out position. LOL

07 FJR 48,000 miles 03 Yamaha FJR1300
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post #15 of 15 (permalink) Old 10-09-2019, 09:27 AM
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That's controlled by your right wrist, Phil... surprised you didn't know that, LOL.
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