Exhaust Pressure sensing

[Andris Skulte]

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...

Andris
Z28tt-89 IROC DFI Twin Turbo T56

On Wed, 20 Feb 2002, Craig Dotson wrote:

> I have searched the archives trying to pick up good ways to measure exhaust
> backpressure.  I have found references to welding NPT bungs and Swagelock
> fittings onto a header, and this sounds practical.
>
> The questions I had which I have not yet found an answer to in the archives
> (there are a lot of them) are:
>
> What type of pressure sensor is capable of surviving exposure to exhaust
> gases?
>
> Is there some way of measuring with a pitot-static probe, to get both
> dynamic and static pressure?
>
> Does the NPT tap/Swagelock setup measure solely pressure at the tube wall of
> the header or does it protrude into the center of the tube?
>
> Which pressure is better to measure, wall pressure or pressure at the center
> of flow?
>
> I will be attempting to measure exhaust backpressure on a restricted, fuel
> injected 600cc Motorcycle engine.  The header this is installed on will be a
> testing-only header which also has EGT probes in it.  Purposes for
> collecting exhaust pressure will be to design a custom camshaft that will
> allow the engine to work with the restricted setup better.  It might also
> contribute to advances in the design of our custom exhaust collectors.
>
> Thanks in advance,
> Craig Dotson
> crdotson at vt.edu
> 2002 VT FormulaSAE
>
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------------------
Andris Skulte
Skulte Performance Designs
http://www.skulte.com
Z28tt-89 IROC T56 DFI Twin Turbo

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