Balancing two Bing 54 Carbs on a Rotax 503

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

Tuneturkey

Well-Known Member
HBA Supporter
Joined
Dec 29, 2018
Messages
68
Location
10113, Hyde Park Ct., Baton Rouge, LA 70816
As a alternate to using a manometer to balance the two Bing 54's, is is possible to use a Dwyer, diff. pressure ga, 10 inches of water max rating, to do the fine tuning on the balance. Can't find the manifold suction pressure rating for the 503, but I suspect it is in line with the impulse pressure, around +/- 2-3 PSI, which is much in excess of the 10" water, but doing a mechanical balance with the slide pistons, to get close, then a fine tune with the Dwyer Ga.
Comments,
Thanks
 

kent Ashton

Well-Known Member
Joined
Aug 15, 2008
Messages
739
Location
Concord, NC
An idea from motorcycles: Small diameter clear vinyl tube formed into a circle with a B-B in the bottom of the loop. Differential suction displaces the BB. It is fairly sensitive.
 

proppastie

Well-Known Member
Log Member
Joined
Feb 19, 2012
Messages
4,514
Location
NJ
I have one of those mercury balances..before that I would just hold my hand close to each carb inlet, and/or at the end of each exhaust. Any pressure gauge could work including a clear water tube with colored water. Never used the Dwyer....long time ago seemed to be 4 to 8 cm of mercury on a big 4 not sure about that though.
 

Hephaestus

Well-Known Member
Joined
Jun 25, 2014
Messages
1,661
Location
YMM
My instinctive answer is you should check your local MG, triumph or Norton club.

Sorry best carb synchronization comes from octogenarians who use nothing but basic hand tools and no fancy gauges (sometimes they come out, but if they do you know you've got other problems) most likely will cost you rye or a case of labatts around here :)
 

Jim Chuk

Well-Known Member
Joined
Mar 30, 2013
Messages
111
Location
Chisholm Mn USA
Another way is to watch this utube video, and do like this guy is doing., I'm going to make a set up like this for my 912. What I did so far was run a line from each manifold to a T, with one end of the T going to a large vacuum gauge. I had a shut off valve in each line coming from the manifolds, and would open one while the other was closed, get a reading and then reverse the valves to get a reading from the other side. JImChuk
 

Bill-Higdon

Well-Known Member
Joined
Feb 6, 2011
Messages
590
Location
Salem, Oregon, USA

delta

Well-Known Member
Joined
May 26, 2011
Messages
2,132
Location
Brookside Utah
Make sure that what ever method you use, you also check the synchronization at partial throttle. Sometimes a small diameter hose between the carb and your ear will do in a pinch.
 
Top