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.

--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html