<VV> Descending a mountain

[J R Read]

Mark,

The problem comes when the decent begins in that cooled air at (say) 7000 
feet which is about 20(ish) degrees colder than at sea level.  And then, 
going through the mountains, the heat - cool cycle is repeated several times 
in succession.  As someone else has already said, relatively mild speeds are 
called for so as to help avoid sudden changes in engine temp.

You can get a similar rapid temp change on the tollway (we got plenty of 
those around Chicago's flatland 700' above sea level).  Come cruising up to 
the toll both at 75ish.  Stop just long enough to pay the toll (usually 
involves a wait - at essentially idle - behind a few cars for your turn) and 
then blast off again to get back to your "cruising" speed.  Virtually all of 
those stop and go tolls are gone now - except for folks who do not have the 
Ipass (transponder).

Later, JR


----- Original Message ----- 
From: "Mark Durham" <62vair at gmail.com>
To: "J R Read" <hmlinc at sbcglobal.net>; "VirtualVairs" 
<virtualvairs at corvair.org>
Sent: Tuesday, May 08, 2012 9:21 AM
Subject: RE: <VV> Descending a mountain


> Boys, boys, the ambient temp drop as you climb enhances cooling, and
> since the air is thinner, the engine cannot produce as much power/heat,
> so nature automatically compensates for the extra heat from the climb,
> just make sure the build is right and go drive the things! the best
> thing you could do is to leave the rear doors or the complete lower
> shrouds off in the summer which will more than compensate for the extra
> heat in a climb.
> Mark Durham
>
>