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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> SuperTigre Engines Support >> Feeding big tigres
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Feeding big tigres - 4/4/2002 10:46:47 PM   
amcross



Posts: 2644
Joined: 1/8/2002
From: Tuscola, IL, USA
Status: offline 		Once your BIG SuperTigre has a gallon or two of regular fuel run through it, you can use one of the so-called "SuperTigre, or Super-T" fuels, which have 10%-12% oil content. Keep Nitro 10% or lower for best operation.

To properly set up your carburetor, there are a few steps...

Make sure the spraybar is set so that the fuel slot is pointed straight down the center of the carburetor. You will have to look through the carb from the bottom, with the venturi opened to full. Loosen the two screws next to the high-speed needle valve to rotate the spraybar so that the slot is centered.

The idle needle can be seen in the slot of the spraybar. It looks like a piece of wire that has the end squarely cutoff. It should be less than one-half way across the slot when the venturi is opened to full.

The high-speed needle should be opened about 2-1/2 to 3 turns out from closed.

All of these settings are very rich. You'll have to start the engine at about 1/4 to1/3 throttle. Once the engine starts, advance the throttle to full. You can then lean the high-speed needle until the engine is running just rich of peak RPM.

Once you have the high-speed needle set, you can retard the throttle a bit and use the idle needle to adjust the engine. Retard a bit, and adjust. Keep doing this until you have reached the desired idle RPM and mixture. Remember, since we started out with an intentionally-rich setting, the idle mixture will have to be leaned.

Finally, the midrange can be adjusted by rotating the spraybar a hair. Just loosen the two screws next to the high-speed needle and rotate the spraybar just a tiny bit. Either direction is OK. This will help you get a good transition and midrange.

We use an O.S. #8 glowplug, although a lot of people have had success with the O.S. Type F glowplug. We recommend you try both to see what works best for you.

Many people like to use larger volume fuel tubing to feed these monsters to avoid the chance of insufficient flow. This works quite well and is also recommended.

Great Planes Model Distributors
[email]productsupport@greatplanes.com[/email]
[url]www.greatplanes.com[/url]
[url]www.bestrc.com[/url]
Phone: (217) 398-8970
Fax: (217) 398-7721

< Message edited by Bax -- Feb 21 2003 10:37PM >
       Post #: 1

Feeding big tigres - 4/14/2002 6:36:31 AM   
HarleyRider



Posts: 131
Joined: 2/13/2002
From: Peachtree City, GA, USA
Status: offline 		Thank you for some good information on the large ST engines. I have a ST3250 and it runs great on ST fuel with 5% nitro and around 10% on oil. I use the OS F glow plug. My problem is this, the only hobby shop that sells this fuel is forty miles away. I can buy 5% at my LHS, but it has 18% oil. Do you think this engine would do alright on this oil contend?

Thanks for your help.

(in reply to amcross)
       Post #: 2

Feeding big tigres - 4/14/2002 8:48:06 PM   
mdmaurer


 

Posts: 15
Joined: 3/6/2002
From: South Jordan, UT, USA
Status: offline 		If your local shop has fuel with 10% nitro and 18% - 20% oil, just buy a gallon of that and then mix it with a gallon of methanol. Bingo! You have 5% nitro and 10% oil fuel. This also cuts your fuel cost substantially as methanol is cheap.

(in reply to amcross)
       Post #: 3

Feeding big tigres - 4/15/2002 3:27:53 AM   
THE TAILBACKER


 

Posts: 139
Joined: 3/2/2002
From: New Mexico
Status: offline 		That is standard stuff. If the engine was designed to have larger tubing, why does it not come with larger fuel nipples on the carb for a good fit? I am not knocking it here, Like I said somewhere else here, I have two of them and they now run superb.
Different carbs are the only simple modification for smooth performance. Most people complain only of midrange problems. When this happens, you can go two ways, 5-10 modofications which are a hassle, or install a different brand of carb and be done with it.


_____________________________

Retired Army Aviator
AMA#681130

(in reply to amcross)
       Post #: 4

Feeding big tigres - 4/17/2002 4:51:07 PM   
amcross



Posts: 2644
Joined: 1/8/2002
From: Tuscola, IL, USA
Status: offline 		Many large model engines seem to have the paradox that they must use large tubing, but the hole in the fuel inlet nipple seems awfully small. Actually there's no paradox at all. The hole in the fuel inlet nipple is plenty large for the engine's needs. The problem is in fuel line drag.

If the carburetor's properly-designed, then it will have plenty of fuel draw, but the regular-sized fuel line will only allow so much fuel to pass through it. Remember, the engine's not pumped, so it must rely on the carburetor's ability to "suck" the fuel from the tank. Smaller fuel tubing will actually have a limit on how much fuel can pass through it when drawn by the carburetor's "suction".


Just try breathing through a straw. It's easy to draw air if you inhale slowly, but just sucking hard. You'll find that it becomes quite a bit more difficult. It the straw immediately opened up to a much larger diameter after it left your mouth, you'd find that you could draw a lot more air much more easily. The same with the fuel line.

Use the next larger size fuel line, use larger tubing in the tank, and drill out the clunk so that its hole is large. The larger fuel line is a bit loose on the tank tubes and fuel nipple on the engine, so you'll have to wire-tie everything in place. You'll be surprised how much better the engine will run!


Sincerely,
Mrs. AnnMarie Cross
Senior Manager, Proprietary Services and Support
Great Planes Model Distributors
[email]productsupport@greatplanes.com[/email]
[url]www.greatplanes.com[/url]
[url]www.bestrc.com[/url]
NO AUTORESPONDER

(in reply to amcross)
       Post #: 5

ST stuff - 4/19/2002 5:29:14 PM   
Hobbsy



Posts: 10836
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		When I run large fuel line I prefer to solder fuel line barbs on the tank connections. Also, replacing the Stock carb on a SuperTigre is totally unecessary and mods are not required either.

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to amcross)
       Post #: 6

Enough is enough!!!!! - 4/19/2002 10:43:41 PM   
GrnBrt



Posts: 6992
Joined: 12/5/2001
From: Everett, WA, USA
Status: offline 		These forums are for asking technical questions of AnnMarie, and if you have a viable solution to a problem then post it. These sub forums are not here to argue points, nor are they here to bad mouth a product, or parts of that product. If you want to do that then take it to the regular forum. We will not put up with it anymore.


_____________________________

Art Grabow SR
Senior forum Manager

US Army Special forces, mess with the best, die like the rest!

(in reply to amcross)
       Post #: 7

Feeding big tigres - 2/5/2003 1:07:08 AM   
Mike Bogh



Posts: 2466
Joined: 12/7/2001
From: MT Vernon, WA, USA
Status: offline 		Bump


_____________________________

Best to you all,
Mike
In memorium
Art Grabow Sr. AKA Grnbrt..RIP mah Brother

(in reply to amcross)
       Post #: 8

Feeding big tigres - 2/5/2003 1:11:46 AM   
Mike Bogh



Posts: 2466
Joined: 12/7/2001
From: MT Vernon, WA, USA
Status: offline 		BTT


_____________________________

Best to you all,
Mike
In memorium
Art Grabow Sr. AKA Grnbrt..RIP mah Brother

(in reply to amcross)
       Post #: 9

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> SuperTigre Engines Support >> Feeding big tigres
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