[alfa] Re: Gas issues

[Joe Elliott <jee@xxxxxxxxxxxxxx>]

I would suspect that the negative effect of nippy weather on tires 
would be more significant, but that wasn't the question, and I don't 
think southern CA is ever genuinely nippy.

If you sit down and count the molecules (or, if you prefer, the 
oxygen atoms) in a cubic centimeter of air on a cold day, you will 
find that there are more of them than there are in a cubic centimeter 
of air on a warm day.  So when the engine sucks in a given volume of 
air, it's actually getting more oxygen on a cold day, and hopefully 
its fuel system figures this out and delivers proportionally more 
fuel.  More fuel/air mixture = more power.  Theoretically, the 
difference between ingesting 90F air and 20F air would be equivalent 
to boring out a 2.0L engine to 2.3L.

Joe


At 9:53 PM +0000 10/9/04, alfa-digest wrote:

> The AROSC encourages boy and girl racers to come to their time trials in
> the "cold" months by telling them the best times are almost always made
> when nippy out - as opposed to on really hot days.
>
> Okay, I'm sure they don't start their runs with cold engines, but the
> implication is "cold air is good".
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