David Leonard wrote:

I am starting to come to the realization that I am going to have to
re-do my motor mount (again).  In this picture, the turbo is only

about

1/4 inch from the motor mount tube.  I had been hoping (probably
deluding) that I might be able to insulate the mount with a SS heat
shield and blast tube with perhaps some insulating wrap.  Does

anyone

think I might be able to make this work?  How will I know if it is
getting too hot?  How far away do I need to move the mount?

David Leonard
The Rotary Roster:
http://members.aol.com/_ht_a/rotaryroster/index.html

Looks a bit too close to me too. That RTV hose will not take the kind

of

heat
that turbo will put out. And of course the nylon tie wrap will go away
faster than a speeding bullet :)

It will be less vibration if you rotate those rubber motor mounts 90
degrees.
What airplane is that Dave? RV4?

I also suggest you run the exhaust straight out the side to get rid of
as much heat as soon as possible.

Sorry to be such a pessimist.

Paul Lamar

That is an RV-6.  I want the exhaust going straight down so that it cant
get in the air vent or canopy.  I also don't want it getting soot all
over the side of the airframe.  The distance down is only a few inches
further.

You are right of course about the silicone fire hose.  I was thinking of
a standard motor mount heat shield made out of SS with a blast tube
coming from underneath and maybe some exhaust wrap in there as well.
Or, maybe I'll re-build the mount and use a heat shield.

Those rubber mounts are conical and should work well in either
direction.

Thanks for your input.

David Leonard
The Rotary Roster:
http://members.aol.com/_ht_a/rotaryroster/index.html

Four conical mounts are designed and used for cantilevering an aircraft engine.
You are using only two in a bed mount situation to accept 90% of the total load
in the radial direction.

Paul Lamar
 
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