REFLECTOR: Franklin carb heat

aminetech at bluefrog.com aminetech at bluefrog.com
Mon Nov 9 09:44:56 CST 2009


Carl,

My crossover pipe goes over the top like yours.  However the connection on the pilot side is identical to the other side - 90 degrees - which puts the pipe very close to the #6 cylilnder.

My oil leaks are from numerous spots on the engine.  The main seal is not one of them.

John

--- hoffman3 at erols.com wrote:

From: Carl Hoffman <hoffman3 at erols.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: Franklin carb heat
Date: Sun,  8 Nov 2009 20:13:27 -0500 (EST)

John,

The original crossover pipe must be discarded or you will not get the lower cowling on. It went straight across from intake manifold to intake manifold.

A new crossover pipe is made which goes up and over the prop.

The nipples on the cones on the end of the intake manifold are cut off. New nipples from the discarded crossover pipe, were welded (inert gas) back on the cones with the new nipples pointing up and toward the prop.

The short hose, hose clamps, and heat shield used with the original crossover were used with the new crossover. I assume you have this heat shield. It does come close to the exhaust manifold.

I remember seeing your engine from Atlas Motors sitting in Tim Crawford's basement.

My engine blows by a 1/3 quart oil an hour. Notice how I ran the  1" SCAT hose to below the engine. I think this may be the source of your oil. I had it on top, and change the crank seal to no avail.

The above pictures were shrunk down using Window 2000 Paint. As Jim Agnew pointed don't Windows 7 Paint. My Windows 2000 computer communicates fine with the Windows 7. Windows 7 won't communicate with Windows 2000.

Carl



---- Original message ----
>Date: Sun, 8 Nov 2009 06:14:12 -0800
>From: <aminetech at bluefrog.com>  
>Subject: Re: REFLECTOR: Franklin carb heat  
>To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>
>Thanks, Carl,
>
>I'm envious of your and Larry's pics with no evidence of oil leaks.  Of course, at 200 hours, mine was bone dry also.
>
>Did you modify the pilot side end of the crossover pipe?  Mine is very close to the #6 cylinder.
>
>John
>
>--- hoffman3 at erols.com wrote:
>
>From: Carl Hoffman <hoffman3 at erols.com>
>To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>Subject: Re: REFLECTOR: Franklin carb heat
>Date: Fri,  6 Nov 2009 20:23:29 -0500 (EST)
>
>John,
>
>The factory offered to ways to route the carb heat cable.
>The attached picture show the oil lines, Prop, mixture, throttle, and carb heat cables coming out of the pilot side duct. The cable makes a 180 deg turn and is attached to the heat box.
>
>Carl
>
>---- Original message ----
>>Date: Fri, 6 Nov 2009 14:33:03 -0800
>>From: <aminetech at bluefrog.com>  
>>Subject: Re: REFLECTOR: Franklin carb heat  
>>To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>>
>>   Larry,
>>    
>>   Thanks.  That is a lot different and looks like a better design.  I've glassed in
>>   washers, so I'll see how that works.  I wonder if the shaft was moved on mine to
>>   keep the cable inside the engine compartment?  I would have to figure out how to
>>   re-route the cable if I switch to the factory version, unless I change it so the
>>   flap opens forward.
>>    
>>   John
>>
>>   @hotmail.com wrote:
>>
>>   From: "Laurence Coen" <lwcoen at hotmail.com>
>>   To: "reflector16" <reflector at tvbf.org>
>>   Subject: REFLECTOR: Franklin carb heat
>>   Date: Fri, 6 Nov 2009 11:49:51 -0600
>>
>>   John,
>>    
>>   The photo of your carb heat box doesn't look anything like the factory version. 
>>   The factory version that is supplied with the Franklin engine install kit has the
>>   shaft at the very top of the upper, not the lower, half of the carb heat box.  The
>>   shaft is supported by a washer on each side of the box that are molded into the box
>>   and covered with bi-ax.  I have included two views to help you visualize what it
>>   looks like. There is a side view that shows the location of the shaft and operating
>>   lever in the heat off position.  The flap is horizontal and flat against the upper
>>   surface of the heat box, closing the heat opening attached to the scat hose.  The
>>   second picture is looking into the cold air entrance of the heat box with the
>>   screen removed.  The flap is in the heat on position.  This is built according to
>>   the factory instructions and works well and is trouble free.
>>    
>>   If you wish to start over instead of trying to salvage what you now have, you can
>>   order a Franklin carb heat box kit from the factory.
>>    
>>   Larry Coen
>>   N136LC
>>   


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