Exhaust Pressure sensing

[Shannen Durphey]

Get kinda fancy and use silicon hose.
Sometimes the GM dealers will have short lengths as they were used to connect
the vacuum modulators on many a GM trans.  This can be connected to a short
length of metal tubing to save the rubber ends from getting burned and falling
off.

Some tool companies sell special kits for reading back pressure.  Some of 'em
are nothing more than a vacuum gauge, length of silicon hose, and adapters to
allow you to remove the O2 sensor and plug the hose in there.

Shannen

Greg Hermann wrote:
> 
> 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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