Wife and I noticed that when we opened the sunroof on our '71 bus at 50mph, the
Cylinder head gauge climbed 50 deg F in 2 minutes give or take...(if memory serves,
depending on wind direction)

>
>  Gen Berg wrote about the the air flow on his bus and the differance the
> vent widows and mirrors made in air pressure and vacuum when they where
> open and closed they interrupted the air flow and made the cooling fan
> less effeciant

--
Jim Hayes

Pixelography: The marriage of silicon and silver.
Images at http://www.jymis.com/~jimhayes