Mailing List flyrotary@lancaironline.net Message #22109
From: WALTER B KERR <jbker@juno.com>
Subject: Re: [FlyRotary] More MAP measurement questions
Date: Wed, 18 May 2005 15:48:21 -0400
To: <flyrotary@lancaironline.net>
I could babble on about this, but my point is to ask where others are measuring their MAP (turbo folks need not apply).  You'll also have to give a general description of your intake layout.   I already know that Ed and Tracy are using the "typical" situation.  Is anyone measuring MAP in the runner to the engine? 
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Hi Rusty,
 
Yes , I measure in the runner and do not have a plenum down stream of the T/B. But Tracy and I have had this very discussion, my MAP attempts to measure the stagnation or total pressure. My comment to Tracy is that if he has a plenum after the T/B , that he is measuring the stagnation pressure. My tube sticking into the runner has a 45 degree slant cut on it and the opening faces toward the average flow. Tracy says that the runner sees all kinds of pressures as the rotor inlet opens and closes. I agree with that, but think you want the average stagnation pressure which is what his plenum measures. I added a lawnmower fuel filter in the MAP line to attempt to dampen any pulses out.
 
Bernie, no flying today
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