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Date: Thu, 21 Jun 2012 11:44:36 -0400
From: Ernest Christley <echristley@att.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: MAP drop
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Bill Bradburry wrote:
> Ernest,
> 
> My filter gets pressure from the air entering the nostril.  I get about 0.5
> inch manifold pressure above baro on takeoff.  No drop that I can see.
> 
> Bill B
> 


This was the piece of info I was looking for.

I did a WOT speed run this morning, with the engine was bouncing between 4900 and 5100 RPM and the MAP wavering between
97.5 and 98.1 kPa.  The computer normalizes the MAP to 100kPa when you turn it on, so you can think of the reading as a
percentage of ambient air pressure.  I'm only getting her up to about 30mph. I didn't have the GPS running, and forgot
that I have an airspeed indicator.  I just looked to keep the speed down.  There isn't much ram pressure at 30mph, but I
was hoping that my blower would do better than what it seems to be doing.  My goal is to get a reading above ambient.

I'm starting to get the engine to run smooth now, though.  After the run, I sat there letting it idle.  The AFR coming
in at around 16, and the idle down to around 1400, you could have sat your coffee on the panel and not even worried
about all those expensive electronics beneath it.  Smooth as butter.