Exhaust Pressure sensing

[Axel Rietschin]

It's just that a copper tube connected to the exhaust manifold is not
exactly a constant, closed volume. The temp drop in the tube will have
absolutely no effect on the pressure reading, the "room" created by the temp
drop will be filled in by the engine, so to say.

Cheers,
Axel

----- Original Message -----
From: "Eck, Joel" <Joel.Eck at COMPAQ.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, February 27, 2002 16:14
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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