Firewall Forward: Firewall

 

 

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September 25 - October 5, 2008: (8 hrs.)   

I really did not like how my custom fabricated throttle bracket turned out.  The throttle cable was way to close to the exhaust, and I was unsure about my use of aluminum for this part.

I decided to make a new bracket.  I came up with an idea to use aircraft grade .050 steel and bend it to form a channel for the cable to ride in while also 'shielding' the cable from heat.

After much time cutting, and pounding the steel, I finally had the shape I wanted.  I then used my MIG welder to close up the end of the bracket.
After a bit of filing, grinding, and high heat paint.  Here is the finished product.  I am very happy with how this turned out.  It is very rigid and should be plenty strong.
Here is the new throttle bracket installed.  Notice there is quite a gap now between the bracket and the exhaust.  Additionally, since the throttle cable rides inside the bracket, it is protected from the heat of the exhaust pipe.
Here is another shot of the throttle bracket from underneath.  You can see the safety wired attach screws.

 

While I was working down here, I decided I did not like the routing of my sniffle valve (arrow on the bottom).  Because the exhaust cross-over was in the way, I had to use a 90 degree fitting to get the sniffle valve to fit... well, since the sniffle valve is gravity activated when there is no pressure in the sump, I re-thought the 90 degree elbow.

 
Here I have installed a 45 degree elbow for the sniffle valve (fire-sleeved), and re-routed the aluminum tubing more centrally between the exhaust pipes.
Another shot of the sniffle valve re-routing.

 

While I was working on the engine, I also began the process of checking the torque on all the nuts and fittings.
December 2008: (8 hrs.)   

Spent quite a bit of time doing miscellaneous work in the engine compartment.  Securing everything with safety wire and Adel clamps, etc.

Here I have installed the SCAT hose (orange hose) for the cabin vent.  The feed comes off of the rear baffle  goes to a heat muff on the #1 exhaust pipe, and then from there to the cabin heat valve on the firewall.

 
   
   
   
   
   
   
   
   
   
   
   

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