RE: Commpression (sic) checks

["TJ" <tj@domain.elided>]

Russ,

You are correct.  With less Atmospheric pressure the air is less dense
and thus the engine would be able to compress less of it.  This is the
reason that "conventionally aspirated" engines lose power at altitude.
It's why turbocharged and supercharged engines work better at altitude,
and why airplanes added turbo and supercharging to their engines long
before cars.  Seems at 40,000 feet there is quite a lot less air to
squeeze than at sea-level.  = )

Regards,
TJ

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> -----Original Message-----
> From: owner-alfa@domain.elided [mailto:owner-alfa@domain.elided] On Behalf
Of
> AlfaNeely@domain.elided
> Sent: Wednesday, November 13, 2002 6:34 AM
> To: aroctech@domain.elided; alfa-digest@domain.elided
> Subject: Commpression (sic) checks
> 
> In a message dated 11/12/2002 6:39:00 PM Central Standard Time,
> owner-alfa-digest@domain.elided writes:
> 
> 
> > Date: Tue, 12 Nov 2002 17:35:21 -0500
> > From: Ferdinando Di Matteo <aroctech@domain.elided>
> > Subject: Commpression checks
> >
> > Here is one to kick around, if I get a high reading at sea level,
then
> > drive up to  a 14,000 foot mountain top.  would I get a higher or
lower
> > reading then?   Fred
> >
> >
> 
> 
>        I vote for less.  At 14,000 feet the air is thin and there is
less
> to
> compress, therefore, less compression on the gauge.
>        On the other hand, the compression gauge will be higher, due to
> being
> on a mountain top, therefore, the reading will be higher, even if the
> gauge
> needle sweeps less of the scale.
>       If a man says something on a mountain top and there is no woman
> around
> to hear him, is he still wrong?
> 
> Ciao,
> Russ Neely
> Oklahoma City
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