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From: "Bill Bradburry" <bbradburry@bellsouth.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
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Subject: RE: [FlyRotary] Re: MAP line suggestions
Date: Tue, 11 Sep 2012 12:22:39 -0400
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You can pick up the manifold pressure anywhere out of that plenum.  I get
mine out of the rear of a similar plenum.  That would be far enough away and
protected from a sightline for radiant heat to protect it from melting.  I
have two pickups and I have them combine and then separate before they feed
the two inputs for the EM-2.

Use the vacuum hose that is made of a rubber like material.

Bill B

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Chrisltey
Sent: Tuesday, September 11, 2012 12:03 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: MAP line suggestions

On 09/11/2012 10:24 AM, Bill Bradburry wrote:
> That doesn't look like the rubber vacuum line sold in auto parts stores.
It
> looks shiny and like plastic.  I would switch to the auto parts type.
> I can see probably the two primary injectors right by where the line
melted.
> That area should not be too hot since fuel is right there.  However I do
see
> the EGT thermocouple line going by the area as well.  That may be
> transferring heat to the plastic line.
> Do you have a picture a little farther back to help orientation as to
where
> we are looking on the engine?
>

I got the line from Advance Auto, and it was labelled as high-temp MAP 
line.  I will look to see if I can find something different.

I've attached the best pic I could find to show where I'm pulling the 
MAP from.  There really doesn't seem to be many options to relocate the 
pickup as Dave suggests, because the line will still need to loop around 
to the "bathroom handle" firewall penetration.

Mark, I don't think I have the option to pick up MAP without being near 
the exhaust unless I completely redesign my intake.  I do have the 
exhaust completely encased in a .020 stainless box, but I think the 
issue is that without a blast tube into the encasement, the heat has no 
where to go.  I also think that air comes off the prop, through the 
front mounted radiator, and swirls around the engine inside the cowl.  
That would blow air past the exhaust and right across the MAP and 
electrical lines.  But I've not thought of a way to verify this theory.