Date:         Sun, 8 Jun 2003 11:30:05 -0700
Reply-To:     David Marshall <vanagon@VOLKSWAGEN.ORG>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Marshall <vanagon@VOLKSWAGEN.ORG>
Subject:      Re: Degrading Comments
Comments: To: Dennis Haynes <dhaynes@OPTONLINE.NET>
In-Reply-To:  <000401c32c92$a97c9f70$6400a8c0@masterpc>
Content-Type: text/plain; charset="US-ASCII"

How does a turbo work then?  I assume that 10 PSI boost means that the
manifold pressure is 10 PSI greater than the atmosphere pressure.  So
wouldn't that mean that you are still making less power at altitude than at
sea level?  Perhaps I am totally wrong here - heck this is why I am asking
the question! :-)

David Marshall

Fast Forward Automotive Inc.
4356 Quesnel-Hixon Road
Quesnel BC Canada  V2J 6Z3

http://www.fastforward.ca    mailto:sales@fastforward.ca
Phone: (250) 992 7775        FAX: (250) 992 1160

- Vanagon Accessories and Engine Conversions
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-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
Of Dennis Haynes
Sent: June 6, 2003 6:18 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Degrading Comments


A naturally aspirated engine will lose 3% for 1,000 feet of altitude.
This goes for gasoline or Diesel. The major factor is decrease
atmospheric pressure which will result in decreased cylinder charge.
This why lower octane fuels such as 83 or 85 are used in high altitude
areas.

Dennis



-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf
Of Pensioner
Sent: Friday, June 06, 2003 8:13 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Degrading Comments

Engine performance degradation as function of altitude?  Data, numbers,
curves, experiences?  NB it has been pointed out that the air resistance
actually decreases at altitude.  I'm looking for engine performance
numbers
independent of van configuration.

p