Fuel Tank Positioning for Gas Engines?
03-01-2019, 05:48 PM
#1
Thread Starter
Fuel Tank Positioning for Gas Engines?
I am in the process of converting an old biplane that had a Super Tiger 2300 on it to
a gas RCGF 30 twin (my first twin gasser). With the twin, the carb is hanging below
the engine, so where should the tank centerline be in relation to the carb? At present
the tank position is centerline with the crankshaft, making the carb below the bottom
of the tank! Should I lower the tank?
Thanks in advance for all opinions & answers.
Bill D.
a gas RCGF 30 twin (my first twin gasser). With the twin, the carb is hanging below
the engine, so where should the tank centerline be in relation to the carb? At present
the tank position is centerline with the crankshaft, making the carb below the bottom
of the tank! Should I lower the tank?
Thanks in advance for all opinions & answers.
Bill D.
03-02-2019, 09:30 AM
#4
I like to mount the tank a bit above the carb on a gasser. Two reasons. One it will be easier to get a prime to the engine. Two, some gassers like to go a bit rich while inverted. When inverted the tank placement would then be below the carb making the pump work just a bit harder. That seems to lean the mixture just enough so that when properly tuned there is no noticeable fluctuations in rpm between upright and inverted.
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Spike Lad (07-05-2020)
03-02-2019, 12:40 PM
#7
My Feedback: (19)
No dog in this hunt for me. I've never had a gas powered airframe where I had much room to move the tank in a vertical line. Just fore and aft a bit for balance. I've had a few engines that ran a bit different in changing attitudes but was able to tune the problem out by means other than tank position because I didn't have a choice.
