Exhaust Pressure sensing

[efi_student]

Does the absolute number really mean anything anyway?  Isn't the
objective to measure a change?  Sure the absolute number might be nice
to know, but if all we need to see is change, who really cares what the
absolute number is as long as the system is consistent and repeatable
internally?

Lance

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org] On
Behalf Of Bruce
Sent: Thursday, February 28, 2002 12:28 PM
To: diy_efi at diy-efi.org
Subject: Re: Exhaust Pressure sensing




One of the first statements is, in a container.
In a sample tube, one end is open so it is not a container. Bruce


----- Original Message -----
From: "Eck, Joel" <Joel.Eck at COMPAQ.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, February 27, 2002 10:14 AM
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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