Does anyone know if one of our Rotax ULS carbs failed (ice, filter...) would the engine run on one?
Carbureted Rotax (ULS as example) are virtually 2 half engines joined at the crank, kind of. Left intake manifold & carb feed only that side of the engine. Same for the right side. So if one carb became in-op, only one half of the engine would run - extremely rough, you would think the engine was trying to tear itself off the mount.
So, my question, had this happened in the air, would switching right or left from Both, like a magneto, on a Lycoming or Continental have isolated the bad Carb?
No, each Capacitive Discharge Ignition module fires two sets of coils – one coil for (2) left plugs and one coil for (2) right plugs. Wiring is done in this manner so that if a CDI quits all four cylinders will still have one plug firing. So, to answer your question, the ignitions can’t be used to isolate carb problem on Rotax 912ULS.
Lycoming and Continental can be similar where one magneto fires top plugs on left side and bottom plugs on right side and vice versa.
John,
I’m curious as to why you think magnetos would identify a bad carb on Lycoming or Continental. We’re you thinking of using the ignition switch to identify bad plugs? Shut off one ignition at a time. The rough running mag or ignition module at least identifies which half of the plugs has the bad one.
Rich
Does anyone know if one of our Rotax ULS carbs failed (ice, filter...) would the engine run on one?
Correct me if I am wrong but doesn't each carb provide fuel to only two cylinders, so if one carb failed you would be running on two cylinders?
Correct me if I am wrong but doesn't each carb provide fuel to only two cylinders, so if one carb failed you would be running on two cylinders? I am by no means and expert on this.
Rob