Burp tubes

[fastj22]

Just sent this to robbie in an email, thought I'd share it here.

Put this inline right before your carb so one of the T ends points up.

https://www.summitracing.com/parts/ear- ... /overview/

Then put an AN6 line on the up end of the Tee and route it to the top of the engine where you can get to it during preflight. On the top end of it, put something like this. It will need to be air tight so as not to siphon air during flight.

http://www.aircraftspruce.com/catalog/a ... ey=3008624

Idea is during preflight, open the valve to fill the tube with go juice from the tank. Close the valve. Go fly. As air bubbles form before the carb, they go up the burp tube and are replaced with fuel. Eventually the tube will have no fuel to replace the bubbles so that’s why you prefill it every flight.

Happy burping!

[Sonex1517]

Thanks John!


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[Bryan Cotton]

So do you put the valve next to the fuel filler for easy access?

[fastj22]

So do you put the valve next to the fuel filler for easy access?

I routed mine to the oil filler door (Jabiru, front). Not sure where you AeroVee guys fill the oil. But anywhere you can get to it easily to pre-flight burp. If its lower than a full tank, stop when you get fuel coming out.

[gammaxy]

Is everyone still satisfied with their burp tubes? It seems there's lots of glowing reviews when people first switch. Has anyone had the burps return? Anyone end up totally giving up on the Aeroinjector?

I've mostly had a good experience with the Aeroinjector, but there are some situations where I can reliably create a stumble. On a hot day, if I take off and fly at a low power setting for a while, I will often get a stumble when I increase power. I imagine the fuel is flowing through the lines slower and has more opportunity to heat up and form bubbles. For whatever reason, the bubbles don't seem to cause a problem until I increase power and the fuel flow increases and I imagine they get passed through the Aeroinjector. I wish lutorm would figure out how to give us x-ray vision into the fuel line to know exactly what's happening. Every once in a while I'll experience this sort of a stumble when I'm doing a touch and go. Practice engine failures also regularly end up with a stumble when I re-apply power.

Anyway, if the burp tube fixes these sorts of issues for everyone else, then it's totally ridiculous I haven't already installed it.

I'm considering adding a tube between the Aeroinjector fuel inlet and the fuel tank vent at the top of the firewall. Only thing holding me back is figuring out what combination of hardware I need.

[fastj22]

My burp tube is not a complete cure for the burbs but it does help a lot. When heat soaked in 90+ temps and a long taxi, I still get them on rollout but not to the extent I got them prior to the tube. It basically has cured the burps in cooler temps. Running 100LL also helps a lot.

[pete 212]

hi guys I made an aluminum tube 1nch I/d X 1" tall with 1/8"thread in and out at 90 deg in the bottom and one in the top, installed with a close nipple to the carb, then ran a 1/4 line to the breather out of the tank. Works like charm in AZ with D/A 6000+ and 100F temps. Pete212

[Sonex1517]

Pete - could you post a photo of your burp tube setup?

Thanks
Robbie

[lutorm]

I wish lutorm would figure out how to give us x-ray vision into the fuel line to know exactly what's happening.

:-D

Unfortunately I'm not going to be making much further progress on our Aerovee until we can find someone who can fly the plane... The original owner/builder CFI has lost his medical and he was going to instruct the other owners in it. None of the rest of us have PPLs. Any tail-wheel Sonex CFI that want to take a vacation in Hawaii? As a bonus, flight training can take place over flowing lava to make finding engine-out landing sites more interesting: https://volcanoes.usgs.gov/observatories/hvo/multimedia_uploads/multimediaFile-2249.mp4

[pete 212]

[quote="Sonex1517"]Pete - could you post a photo of your burp tube setup?

Thanks
Robbie[/quote
sorry no pics Pete