Exhaust Pressure sensing

[Greg Hermann]

At 9:14 AM 2/27/02, Eck, Joel wrote:
>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.

The volume may be constant in the tube, but the amount _certainly_ is NOT !!

There will NOT be any effect whatsoever on the pressure measurement, other
than PERHAPS a VERY slight lag !!!

Suggest you quit wasting time and bandwidth mis-applying the gas laws !

Greg
>
>-----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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