Exhaust Pressure sensing

[Greg Hermann]

Usual practice is just to measure static pressure at the wall. A GM MAP
sensor works just fine. Simply use a long enough connecting tube to keep
the heat away from the sensor. (With no flow through the tube, it will stay
cool at the sensor.)

Greg

At 12:46 PM 2/20/02, 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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