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Date: Wed, 18 Aug 2004 17:18:36 -0400
From: Mike Robert <pmrobert@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: EM-2 MAP readings
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DELTAFLYER@prodigy.net wrote:

>I seem to have just the opposite problem.
>With WOT I have no problem seeing 30-31"MAP whatever
>is the pressure of the day.
>My problem is at idle I never seem to get less than 
>15" MAP. This would mean that I will always be running 
>in staged mode with both injector set operating 
>because Tracy set the staging point at 15". I know 
>that this is adjustable but I'm wondering why I can't 
>get <15"MAP.
>Has anyone recorded a table of RPM vs. MAP for the 
>range of 1000RPM-6000RPM?
>I'm especially interested in the low end and would 
>appreciate any input from our more experienced 
>rotorheads.
>
>Jim Maher
>Dyke Delta N11XD
>
>  
>
I have a fairly radically ported NA 12A (car) and usually idle 
(1000-1100 rpm) at just under 15" (43-48 kPa). If I set idle at, say, 
1500 or so, my MAP is below 40 kPa (13"?), easily. If you're idling 
where most aircraft rotaries are (>1400 or so? ) you may have a leak in 
the manifold->sensor line, really bad apex seals, bad soft/firmware 
calibration or ...  etc.?

      -Mike, rotary lover....