Fuel setup.

[gammaxy]

About a minute later I started burping and it did so about three or four times.

Are you sure its burps and not a mixture problem? I don't think I've ever experienced burps although I do regularly experience a "miss" if I advance the throttle rapidly during the takeoff roll--I don't know if this is what others call a burp or not. I blame my "miss" on the lack of an accelerator pump. Anecdotally, this seems to happen less the richer I have the needle adjusted.

I have also experienced surging near idle settings when in a descent (my working theory is at a fixed throttle setting, the propeller spins faster in a descent than on the ground so the same amount of fuel is metered into a larger amount of air causing the mixture to become leaner. If the setting is pretty marginal on the ground, it might become impossible to adjust the mixture rich enough while in the descent and it surges).

I also regularly pull the mixture lean during climb-out for additional power, but if I level out and leave the throttle at WOT, I need to richen the mixture to keep it running smoothly. This seemed counter-intuitive at first, since I expect to lean at altitude, but I also never fly other airplanes at WOT in cruise :-)

None of these sound quite like what you describe, but have you overruled a mixture problem at 2900 rpm? Intuitively, I would expect you to be moving fuel (and air) through the cowl fast enough at that power setting not to have to worry much about vapor issues. I also admit that the Jabiru 3300 is probably completely different than the Aerovee I fly.

[RodgerC]

For years I've read about the infamous burb in this forum, and its predecessor, along with the guaranteed fixes that include tossing the Aerocarb, change/tune needles, burb tubes, insulation, gascolator removal, cowling mods, fuel pumps, Rotec TBI/Bing carb etc etc. The list goes on. At the risk of extending the debate indefinitely, I'd like to add another possible modification that might be worth adding to the list. Although I'm not certain I've ever experienced a true burb (Other than those induced by Coca Cola) I've certainly had engine misses, though usually during partially closed throttle settings....Decents, taxiing etc. After doing all the usual fuel line fire sleeving and insulating with that nifty self-adhesive reflective fibreglass sheet/tape, it occurred to me that the clearance distance between my exhaust pipe and fuel line was only 1/2 to 3/4". Not a lot when fuel is slowly passing by it due to partial throttle setting. After considering and rejecting the idea of wrapping the exhausts in glass tape, I fabricated a concave heat deflector and strapped it to the exhaust just below where the fuel line crossed overhead. Now it could be pure coincidence, but my engine misses have gone away. So perhaps, before throwing out the baby with the bath water, maybe check fuel line to exhaust pipe clearance and if it seems too close, spend a couple of hours making a heat deflector and see if things don't improve for you too.

[vwglenn]

I'm not certain about anything but the inconsistency of the aerocarb from plane to plane. Some people have no issues running a gascolator. Some have fixed the problem removing it. Some have piped fresh air in. Some have given up and moved on to something else.

My plane didn't come with a pump or a Bing so I'm going in order from the easiest/cheapest fix on up.