[AT] Wind Chill (was RE: oil change)

[Dean Vinson]

> > Sorry, but wind chill can have NO effect whatsoever on any car or
tractor.

> Remind me next summer to take a picture of the  frost on the outside of
the 
> intake manifold of the Cockshutt 40 on a high humidity morning. 


Guys, I think we're talking about different things here.

"Wind chill" as used by the weather forecasters on TV refers to the fact
that wind makes it feel colder to a person outside.  If it's 30 degrees and
there's no wind, our 98-degree bodies can generate heat quickly enough that
we feel warm with only a fairly light coat and hat, and our faces don't
"feel" very cold.  If it's still 30 degrees but there's a 20-mph wind, it
feels a lot colder.  It isn't colder--it's still 30 degrees--but it feels to
us living, heat-generating people like it's 15 or 20.  We've all experienced
that and know that it happens.

Meanwhile, there is this completely separate phenomenon going on inside the
carburetors and manifolds of a running engine.  Pressure changes and the
Venturi effect and all this other cool stuff I've been learning about in
this thread.  Those things actually refrigerate the surrounding metal below
the temperature of the ambient air, and if that temperature goes below
freezing on a humid day then frost can form.  We've experienced that too and
know that it happens too.

I think the distinction some of us are making is that those two phenomenons
are in fact two separate things.  Yes, wind makes it feel colder.  And yes,
carburetors can get frosted up when the ambient air temperature is above
freezing.  But it isn't *wind* that makes them frost up, it's those other
things happening inside the machine.

Dean Vinson
Dayton, Ohio
www.vinsonfarm.net