Exhaust Pressure sensing

[Steve.Flanagan at VerizonWireless.com]

Joel,

I have to agree with Greg, the Pressure will stay the same:

The formulas are correct, however you have assumed that the volume is a
constant.  The Pressure in the closed system will stay the same (P is the
constant), while the Volume will change based on the Temp change.



-----Original Message-----
From: Eck, Joel [mailto:Joel.Eck at COMPAQ.com]
Sent: Wednesday, February 27, 2002 10:14 AM
To: diy_efi at diy-efi.org
Subject: RE: Exhaust Pressure sensing


Actually, it will. Check out this site: 

http://dbhs.wvusd.k12.ca.us/GasLaw/Gas-Gay-Lussac.html

It describes Gay-Lussac's gas law, which shows the direct correlation
between temperature and pressure of a gas given contant amount and
volume. As temperature increases, pressure increases, and, as
temperature decreases, so does pressure.

-----Original Message-----
From: Greg Hermann [mailto:bearbvd at mindspring.com]
Sent: Thursday, February 21, 2002 9:20 PM
To: diy_efi at diy-efi.org
Subject: Re: Exhaust Pressure sensing


At 7:39 AM 2/21/02, Andris Skulte wrote:
>Craig,
> That sounds like an FSAE engine to me ;) If you have a length of
copper
>tubing, the temperature will have dropped plenty by the time it gets to
>the gauge. How much the temp drop affects pressure, I'm sure you could
>calculate based on some quick infrared gun measurements...

The temp drop will have NO effect whatsoever on the pressure
measurement.

Greg


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