Bing carb Jabiru 3300

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Marc W

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Mar 31, 2017
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716
Location
Colorado
My hanger neighbor has a Rans S-6 with a Jabiru 3300. He says he only gets 2650 rpm at WOT. The Jabiru 3300 engines are rated 120 hp at 3300 rpm so 2650 rpm is way down the power curve. He says performance is poor as you would expect. He has the Sensenich fixed pitch prop that is recommended for the 3300. I agreed to take a look at his engine to see if there is anything obvious that would reduce performance that much.

He bought the airplane in Phoenix which is about 1000 msl. We are at 5200 msl so altitude is a factor. The engine has a Bing carb. He has not rejetted for the altitude but I don't think that would make that much difference.

I am not sure what has been checked. He did check the tach and the FBO did his condition inspection so compressions are probably good and I expect the valves have been adjusted. Is there anything on the Bing carb that should be adjusted other than jets? Any other ideas?
 

TFF

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Apr 28, 2010
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14,990
Location
Memphis, TN
I bet it makes a big difference getting the jetting right. That’s a pretty big altitude change. I wonder if you can see it in the exhaust, running rich? Of course I would check the timing. Does it have CHT or EGT? I bet they are “cold”.
 

Chilton

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Jun 28, 2014
Messages
176
Location
Jersey, channel islands
I flew a Jabiru with the 2200 engine which had the wrong jets for the 5000 ft altitude of the strip where it was based, the power loss was frightening, returning the corrrect jetting made a big difference.
 

delta

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May 26, 2011
Messages
2,471
Location
Brookside Utah
There may be an inflight fuel mixture adjustment kit available depending on the carb model.
 
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