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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › gasser build advice
01-10-2015 06:23 PM  5 years ago
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wc_wickedclown (RIP)

rrProfessor

long beach calif

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gasser build advice
can i use nitro fuel line or does the fuel line have to be specifically for gas only

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Insha Allah made in america
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01-10-2015 06:30 PM  5 years ago
RM3

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Killeen, Texas - USA

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must be for gas only.

if you use nitro fuel tubing, it will swell and fall apart.
showing a preference will only get you into trouble, 90% of everything is crap...
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01-10-2015 07:22 PM  5 years ago
wc_wickedclown (RIP)

rrProfessor

long beach calif

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thank you
now i just have to find out what width line i need
Insha Allah made in america
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01-10-2015 09:20 PM  5 years ago
jharkin

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Holliston, MA - USA

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1/8" ID Yellow Tygon for the lines form tank to carb - its the same stuff chainsaws and weed trimmers use so you can find it anywhere - hobby shops, auto parts, lawnmower shops, etc.

Inside the tank the best thing to use is black viton, much more flexible for the clunk line. Its a little harder to find but a foot of it comes in the parts bag with a new Zenoah. Search online and you will find it Im sure.
-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks
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01-10-2015 11:09 PM  5 years ago
GREYEAGLE

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Flat Land's

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Homey / Clown :

Tygon all around use the smaller I.D. stuff inside - It's Very Flexible If you need the Numbers just ask -

Make sure it TYGON Brand - Lot's of Kung Foo Imitation's

It also comes it Blue

Keep the Black crap out out the system, or will have to teach how to clean a walborow carb or the porting circuits . Line should go in the tank make 180 degree turn then come to the front. Floppy inside

Exterior Vent line should have a Loop in it - for Anti siphon

It Don't Dangle Like a EsCo Clunk on a Nitro.

greyeagle
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01-11-2015 02:11 AM  5 years ago
jharkin

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Holliston, MA - USA

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Black line will not gunk up the carb. Viton is much better for the clunk its softer and won't harden with age like tygon. You should try it eagle I'd bet you will like it.-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks
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01-11-2015 03:49 AM  5 years ago
EEngineer

rrProfessor

TX

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Tygon all around use the smaller I.D. stuff inside
The smaller the I.D., the greater the hydraulic drag....
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01-11-2015 04:10 AM  5 years ago
Gearhead

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Vt

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the greater the hydraulic drag
this is true
Jim
Buzz Buzz Buzz
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01-11-2015 04:23 AM  5 years ago
EEngineer

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TX

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Or said another way, the flow rate is more limited...
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01-11-2015 04:28 AM  5 years ago
fastflyer20

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N. Tonawanda, NY

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I agree with jharkin. For 3D, Tygon in the tank is too stiff and does not last long. Viton works much better.Tom
CAUTION - my posts are based on my experiences, yours may be different.
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01-11-2015 04:35 AM  5 years ago
turboomni

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East of the Equator

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I have used the black viton tubing with a smaller ID inside the tank for my 2 gassers with no problems for years. I do mild 3D with both and would not trust Tygon inside the tank as it gets stiff rather quickly with exposure to gasoline and the added alcohol. It is fine outside of the tank as you can monitor it.
The black viton tubing has never gunked up any carb of mine and as a precaution I replace it every year for the heck of it . It seems to still be flexible when I replace it unlike tygon.
I have never suffered from fuel starvation because of hydraulic drag of the smaller ID of the viton tubing.
If you never flip it upside down I guess Tygon would work inside the tank but I wouldn't recommend it.
Setup is everything, All my heli's can fly far better than I can pilot them
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01-11-2015 04:36 AM  5 years ago
EEngineer

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TX

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Point is that there are more options than the local Hobby Town has in stock....
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01-11-2015 04:45 AM  5 years ago
turboomni

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East of the Equator

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I would also recommend not using an inline fuel filter on the line to the carb. I do all my filtering from my gas tank with a crap trap as the final filter before the entering the fuel return line. Make sure you have a good vent and not one with a one way check valve ,,get rid of it.
As a precaution when flying especially the first tank of the day go inverted up high to make sure there is no air in the system, as then you will have time to auto in if the air bubble is big enough to stop the engine. This has never happened to me but it has burped up high and I do it again just to make sure and then it is good to go .
Setup is everything, All my heli's can fly far better than I can pilot them
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01-11-2015 04:50 AM  5 years ago
EEngineer

rrProfessor

TX

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Make sure you have a good vent and not one with a one way check valve ,,get rid of it.
With a pressurized system, I thought the check valve was needed...

The YS valves can be disassembled and the 2 nipple I.D.'s can be drilled out a little to enlarge it....
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01-11-2015 04:52 AM  5 years ago
EEngineer

rrProfessor

TX

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The same thing can be done with an inline fuel filter...

Just check the screen regularly....
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01-11-2015 04:54 AM  5 years ago
turboomni

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East of the Equator

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Wickedclown have you dailed in a gasser before??
Reason I ask is if there is no one in your area with experience with gassers and you have no experience other than nitro you are in for a very "different experience" than your nitro experience and it will be worth next to nothing in tuning a gasser..Just letting you know!! You could fry the motor just as you thought you had it dialed in!!
Setup is everything, All my heli's can fly far better than I can pilot them
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01-11-2015 04:59 AM  5 years ago
turboomni

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East of the Equator

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With a pressurized system, I thought the check valve was needed...

The YS valves can be disassembled and the 2 nipple I.D.'s can be drilled out a little to enlarge it....
The fuel pump in a gasser is in the Walbro carborator ,unlike a YS wich requires tank pressure. The gasser tank is vented,,no pressure and the carb,s fuel pump run by crankcase pressure and vacuum pulses sucks the fuel out of the tank. Just like a weed wacker or leave blower. It is not a tank pressurized system.
Setup is everything, All my heli's can fly far better than I can pilot them
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01-11-2015 05:07 AM  5 years ago
EEngineer

rrProfessor

TX

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gasser
Thought it was a nitro with pressure....
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01-11-2015 05:08 AM  5 years ago
turboomni

rrProfessor

East of the Equator

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The same thing can be done with an inline fuel filter...

Just check the screen regularly....
Problem here is a gasser uses so much less fuel per minute than a nitro , and the result if there is any little air bubble which would not cause a problem with a nitro because of the high fuel flow and high rpms of the engine can cause a problem with a gasser. The fuel flow is much less than a nitro and is why a gasser gets MUCH more flight time than a nitro. A bubble in a inline fuel filter could be a problem when it reaches the Walbro carb fuel pump.
Setup is everything, All my heli's can fly far better than I can pilot them
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01-11-2015 05:15 AM  5 years ago
EEngineer

rrProfessor

TX

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A bubble
Always a problem....
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