Hot idle roughness solved!

[David-aviator]

This is how the cube is installed in my RV-8. It is below the cylinders with the wire on the side. So far it has worked well, flow indication after some calibration is quite accurate. The fuel lines and the cube are wrapped in a heat shield material.
Tom made the fuel lines and was patient enough to do the top line three times to get the length correct.

It is an alternative method to having it without flex tubing on the top. The bottom 90? fitting is steel.

[Mike H]

Very nicely done David. What type of heat shield did you use? I have used a large diameter section of fire sleeve in the past and used safety wire or band clamps to close ends followed by silicone to seal things up.

[C-FAH Q]

Aircraft spruce has a stretchy fire sleeve that works perfectly. its is black and about 20 bucks.

[TS Flightlines]

I can get some large diameter AS1072 firesleeve.

David's install wasnt exactly typical! 1/8-3/16 of an inch DOES make a difference. Part of the reason for trying to come up with a better solution.
Tom

[David-aviator]

I was very concerned about the 90? steel fitting being so close to #1 exhaust pipe. Fuel pressure in this line is low, like 3-5 psi which would make it very susceptible to vaporization. The fix was a Van's heat shield and wrapping the fuel line and cube with surplus fire sleeve.

I like the Vans heat shields, must have 6 pr 8 of them installed protecting throttle/mixture cables and fuel lines.