Float chamber

by Andy Owen in General Tech Discussion 9 years ago

Hi, the vent pips off the float bowl bend backwards and cable tie round the air filter, I have seen pictures of the pipes going to down to the float bowl and tucked under the float chamber clip. I emagine that pressure could have an effect on the fuel level in the chamber, what is the correct position.

Re: Float chamber

by Kevin Stewart » 9 years ago

Kevin Stewart

5 184 0

Hi Andy,

My vent pipes are short and are tucked under the float bowl clips. They have always been like that and experience tells me that you need to be careful with these pipes otherwise you can have an adverse effect on the mixture.

Kevin

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Re: Float chamber

by Roger Lee » 9 years ago

Roger Lee

126 5.13k 4.56k

Many owners have their carb vent tubes tucked into the bowl wire bale. Some have them tee'd together and run down the back of the firewall. If you have a Rotax airbox they run back to that. They can be in different places you just don't want them in a high vacuum area (like in the aircraft air stream) or a high positive pressure area and you want them to get equal air pressure.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Float chamber

by andrew owen » 9 years ago

andrew owen

13 17 3

Thanks Roger, to me the position they are in alongside the air filters(K&M type)will be a spot where there is high vacuum, am I correct in thinking this would have the effect of raising the fuel level in the chamber?

:unsure:

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Re: Float chamber

by Roger Lee » 9 years ago

Roger Lee

126 5.13k 4.56k

Hi Andrew,

If you tuck the vent tube just under the bowl wire bale you'll be good to go. This spot should not cause you any issues. That should be a high vacuum area.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Float chamber

by James Ott » 9 years ago

James Ott

22 322 358

Quite a few of us have run the vent tubes into the back of the K&M air filters thru a tight fitting hole drilled in the rubber down low. This is essentially the same as running them into the airbox if you have one. By keeping the hole as low as possible the tube maintains a gradual slope down so any fuel will not puddle up in the tube. The advantage of this arrangement is that any fuel overflow or drip will not fall on hot exhaust parts, but will be sucked back into the carb. I was very leery about doing this at first because it is not "Rotax Approved", but tested it both ways and found no differences in engine running, smoothness, fuel pressure, etc.

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Float chamber

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