Paul

I want to know about measuring the exhaust pressure, in the exhaust.  Temp
is easy.  For flow I would think with the MAP, and known data about burn
efficiency we can roughly calculate it.  What type of pressure sensors can.
survive those temps?

Doug in Japan

A water manometer with a five foot length of steel brake line
tubing to isolate the exhaust heat from the rubber tubing going to
the water manometer. Should cost all of two hundred yen :)

12 inches of water is .45 psi so you may need a ten
foot high water manometer. Pressure will be above or below
or signed addition to atmospheric.

A mercury Hg manometer would be more compact.

Now the real problem is getting a high speed, high temp electronic
sensor that will  measure exhaust pulse shapes at 6000 to 8000
pulses per minute.

The manometer will measure average exhaust pressure.

The British used an ingenious rotary valve connected to the crankshaft
and 18 Hg manometers. One for each 20 degrees of crankshaft rotation.
for measuring exhaust pulse shapes. Rube Goldberg but effective.
Let me know if you want to build one and I'll send you the scanned sketches
and construction notes.

Paul Lamar ...No rotor no motor.

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