Mark Durham 62vair at gmail.com
Tue Jun 8 18:30:04 EDT 2010

Bob, yes, I agree, I just didn't bother to write that stuff because he was
doing it in the summer when it was already warm.

In the aircraft world, the pilot is trained to wait until the oil temp and
cht temp are in the green before taking off, and that usually is about the
time they are done taxing to the end of the runway and complete a runup, so
a lower airbox is not required. Porsche produced an aircraft engine for five
or six years for the Mooney aircraft line and that engine was fully boxed in
with the porsche fan, but it didn't survive well.

In the car world, we want to get in and go, so the airbox is an absolute
necessity for quick warmup when temps are cooler and provides some margin
against thermal shock by retaining some of the heat, like when going up a
steep hill then over the top and down the other side, it helps prevent cold
soaking when you are no longer pulling power..
Mark Durham

On Sun, Jun 6, 2010 at 7:31 PM, <HallGrenn at aol.com> wrote:

>   In a message dated 6/6/2010 9:44:40 P.M. Eastern Daylight Time,
> 62vair at gmail.com writes:
> The only reason a air cooled engine needs these is to give hot
> air for the cabin in the car.
>  Mark,
> They have other purposes as well.  Like fast warm up of the engine to
> reduce the time the chokes are closed and the mixture is so rich.  Lots of
> advantages to a faster warm up including less engine wear and less oil
> contamination.  There are probably other reasons the boxes and dampers were
> part of the design as well.
> Bob Hall
> Group Corvair
> Corvanatics

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