Gordon,


   To measure exhaust gas flow don't we just need to know the speed of the
   gases, the cross sectional area of the exhaust gas manifold and the
   temperature and pressure?


   Correct me if I am wrong here but it is easy to measure the temp using
   thermo couples or even non contact infrared sensing devices.

   Speed. It is probably close to or super sonic. If we slow it down at
   least
   one order by sending it through a large insulated pipe, we could
   sense it
   with my present ultrasonic equipment used for testing wind speeds or
   flows
   in ducts.

   With a known diameter pipe it is easy to calculate the volume and speed.

   Pressure. High temperature piezo electric sensors are available on the
   market.

   Here is an expensive way that NASA looks at very high speed gas flows.
   Beyond our budget:)


   http://www.grc.nasa.gov/WWW/RT/2004/RI/RIO-mielke.html

   DougFir


   Thanks, Doug.

   Those ideas sound good. Now I just need to get an engine and start
   experimenting.

   There is another way to calculate exhaust pressures that seems
   pretty accurate. I will send you the pdf offline.

   Regards,

   Gordon.




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