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Rotax 912 Carb Venting, question?

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Ceashman(at)aol.com
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Posted: Fri Jan 20, 2006 6:12 pm Post subject: Rotax 912 Carb Venting, question?

Bob Robertson said

 	  Quote: 	
		  Jimmy,

There are drip trays available that fit under the carbs.. I know of no

fires resulting from overflowing carburetors.


	


jdisher said.

 	  Quote: 	
		  safest solution is to take a small funnel with a longer hose attached, fasten

it up under the carb, and merely lay the vent tube in it, so that if 

fuel drips

out it will be collected by the funnel and drained away from the hot 

exhaust and

you have not upset the balance of the carb.


	


Hi guys. 

I remember discussion of the possible fire hazard because of the vent tubes 

hanging out there.

I am trying to understand this:



 While slicing through the air at the blinding speed of a 912 Kitfox and the 

air being squeezed through the cowl opening and out the bottom. I cannot see a 

small funnel or drip tray capturing the flow of fuel. I think while parked on 

the ramp and the prop spinning would cause enough draft to blow the dripping 

fuel away from the devises placed under the drip.

Then again, I don't know I have not been under the cowl with the engine 

running. Maybe there is no or little air movement?



I don't know, is it that the 912 carburetor only overflows when at rest and 

the motor shut down? 



If this is the case I can see the above being solutions if the carb ever 

dribbles especially the funnel and tube, because it has no capacity. The drip tray 

must be larger capacity than the quantity of the expected leakage. 

And more importantly, I can feel more at ease at the controls while the 

engine running on the ground or in the air.



Thanks in advance for information on this. Eric

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