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Thanks for the comments. What are the inside
diameters of your tubes (assuming primary and secondary are different)?
Also, what RPM are you seeing static, when you said you measured essentially
30"? Do you think you could be getting any ram-air effect in your
MAP port with the open end pointing somewhat into the air
stream?
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I do not understand your question Rusty. A good pitot
pressure measures almost 100% ram pressure. This is exactly what plenum static
pressure is equal to. There is nothing adding work or pressure ratio to the air
between the plenum or T/B and the runner. You can not measure a pressure higher
than what is in large plenum, ie very low average velocity through it.
Apparently some think there is a magic here that the ram pressure is higher than
the stopped air pressure. If you put a static probe, a pitot probe, and a
downstream pitot probe in a system they will all read the same number
(ignoring frictional losses)
Bernie
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