The Murphy Builders Site

Gang,

Does it make a difference if I prime 2 or 3 cylinders on an 0320? The MAM kit
supplied enough fittings to prime 2 cylinders. My 0320 (bought used) had 3
primed cylinders as I acquired it. The fourth cylinder was used for manifold
pressure which I will not be using. That would make it possible to prime 4
cylinders if I wanted. Does it make a difference?

My second question concerns the cabin heat muff. there is no room, with the
cross over exhaust (not MAM's), to fit the cabin heat muff any where except
on the tail pipe sticking half way out the bottom of the cowling. I'm not
sure I would get very much heat that far away from the root end of the
exhaust pipe, where I would expect the pipes to be the hottest. I do have
room for another MAM type "carburetor" heat muff close to the root end of the
forward cross over exhaust. Has anyone attempted this? would a MAM type
carburetor heat muff in this location provide enough air flow and heat,
without a 2" ram air hose fitted to it?

Bruce 357R



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Bruce I'm priming on all four cylinders and it works for me. If my engines
cold I give 3 shots of prime before I even get in the plane then I get in
and get organized. When I hit the starter it usually fires on the first
blade. Where ever you put your heat muff the pipes should be hot enough.
Try following another plane at night and check out the blue flames coming
from the exhaust :] but you do need to force the air into the cabin with
ram air or?
Good luck Drew

At 10:00 PM 9/6/01 EDT, you wrote:

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Gang,

Does it make a difference if I prime 2 or 3 cylinders on an 0320? The MAM

kit

supplied enough fittings to prime 2 cylinders. My 0320 (bought used) had 3
primed cylinders as I acquired it. The fourth cylinder was used for manifold
pressure which I will not be using. That would make it possible to prime 4
cylinders if I wanted. Does it make a difference?

My second question concerns the cabin heat muff. there is no room, with the
cross over exhaust (not MAM's), to fit the cabin heat muff any where except
on the tail pipe sticking half way out the bottom of the cowling. I'm not
sure I would get very much heat that far away from the root end of the
exhaust pipe, where I would expect the pipes to be the hottest. I do have
room for another MAM type "carburetor" heat muff close to the root end of

the

forward cross over exhaust. Has anyone attempted this? would a MAM type
carburetor heat muff in this location provide enough air flow and heat,
without a 2" ram air hose fitted to it?

Bruce 357R
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Thanks, Drew, for the advise on the priming and the heat muff tips. I read in
a Tony Bengalis book, rapping a spring around the tail pipe helps. Does
rapping a door spring around the tail pipe, inside the heat muff, really make
a difference in the amount of heat out put to the cabin?

Bruce 357R



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Bruce, it causes the air to slow down and spiral through the heat muff, as
well as adds to surface area that is hot for the air to be warmed from.
"Jack" chain (you know the stuff you hang shop lights with) also works good
for this using safety wire to keep it spaced evenly and to keep it from
rattling and wearing though the pipe.

Regards,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: <Legeorgen@cs.com>
To: <murphy-rebel@dcsol.com>
Sent: Friday, September 07, 2001 11:43 PM
Subject: Re: priming cylinders


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Thanks, Drew, for the advise on the priming and the heat muff tips. I read

in

a Tony Bengalis book, rapping a spring around the tail pipe helps. Does
rapping a door spring around the tail pipe, inside the heat muff, really

make

a difference in the amount of heat out put to the cabin?

Bruce 357R

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Thanks Wayne, I have a lot of that "Jack" chain I can use for the heat muff.
I would never have thought of that.

Bruce 357R




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