TNX 5.2R + Header Tank Mod

[Thai]

Got this idea from a heli enthusiast. Pretty cool I think, and an extra 2 oz of fuel! :D

Drastically reduces any chances of air in the fuel line going to the carb.

http://i135.photobucket.com/albums/q124/Thai_M/Tamiya_TNX_52R/IMG_0140.jpg
http://i135.photobucket.com/albums/q124/Thai_M/Tamiya_TNX_52R/IMG_0133.jpg
http://i135.photobucket.com/albums/q124/Thai_M/Tamiya_TNX_52R/IMG_0131.jpg
http://i135.photobucket.com/albums/q124/Thai_M/Tamiya_TNX_52R/IMG_0130.jpg
http://i135.photobucket.com/albums/q124/Thai_M/Tamiya_TNX_52R/IMG_0129.jpg
http://i135.photobucket.com/albums/q124/Thai_M/Tamiya_TNX_52R/IMG_0128.jpg

[ericem]

cool, how do fill that heli tank?

[Thai]

I just keep priming it. With all my tubing, it did take awhile. But the whole idea is to never let that tank get empty. Once it's filled, it'll stay that way. I guess it's also like a reserve tank, also useful to keep from running out of fuel and getting that lean surge. Oh, and I placed it up front so it will also add a tiny bit of weight up front too.

Inside that header tank, there's a fuel line inside it that picks up the fuel. On the end of that fuel line, is a stainless steel weighted nozzle so that it will always pick up fuel from the bottom, regardless if you are upside down or not, hence, no air.

Also, because the pressure from the exhaust that goes into main tank, there's no foaming from vibrations and such to get to the header tank.

[overdosed]

hmm, but running for ages and ages isnt a good thing since the engine needs to cool down.

also there does seem to be quite alot of fuel line

[Thai]

hmm, but running for ages and ages isnt a good thing since the engine needs to cool down.

also there does seem to be quite alot of fuel line
No worries about overheating here in freezing cold Canada.

Also, lots of fuel line so the engine doesn't get starved of fuel when it's belly up. And lots of fuel line for where the exhaust hooks up to the main tank helps to prevent fuel from getting swashed up to the exhaust in hard turns.

[avablast]

Be careful how much fuel pressure line you run to the main tank because as you stated the pressure goes from the exhaust, than main tank, than header tank, the pressure may not be sufficient enough to get a decent fuel flow from the header tank to the engine. It may run but you would notice a bit less performance,especially as the fuel level in the main tank dropped, increasing air space in the tank, requiring more pressure to fill the void and push the fuel to the header tank, as the engine would be using most of its energy sucking the fuel in, instead of having it force fed by decent pressure.

A good example of to much fuel pressure line hindering performance, is tamiyas ndf-01 cars that ran the exhaust streight to the rear, requiring a long fuel pressure line which would make the small engine flame out often from not being able to draw enough fuel when the tank got half full and goin to lean. Switching to a standard side exhasut with a more appropiate sized pressure line (no more than 8" is the rule of thumb) made a huge difference as it would'nt flame out and ran a lil bit better and reliably as a result.

But thats like comparing a pear with a pea, as the tamiya fx32 (actually a rebadged ofna force .32) is considerably larger in capacity than the ndf01's .15 engine, and would have more inertia to get the fuel on its own accord compared to the smaller engine. For best performance i would still run a shorter pressure line especially with 2 tanks spaced apart.,shorter than standard to main tank like 4" instead of 8", and have a 3" to 4" pressure line goin from main tank to header tank.

[Thai]

Be careful how much fuel pressure line you run to the main tank because as you stated the pressure goes from the exhaust, than main tank, than header tank, the pressure may not be sufficient enough to get a decent fuel flow from the header tank to the engine. It may run but you would notice a bit less performance,especially as the fuel level in the main tank dropped, increasing air space in the tank, requiring more pressure to fill the void and push the fuel to the header tank, as the engine would be using most of its energy sucking the fuel in, instead of having it force fed by decent pressure.

A good example of to much fuel pressure line hindering performance, is tamiyas ndf-01 cars that ran the exhaust streight to the rear, requiring a long fuel pressure line which would make the small engine flame out often from not being able to draw enough fuel when the tank got half full and goin to lean. Switching to a standard side exhasut with a more appropiate sized pressure line (no more than 8" is the rule of thumb) made a huge difference as it would'nt flame out and ran a lil bit better and reliably as a result.

But thats like comparing a pear with a pea, as the tamiya fx32 (actually a rebadged ofna force .32) is considerably larger in capacity than the ndf01's .15 engine, and would have more inertia to get the fuel on its own accord compared to the smaller engine. For best performance i would still run a shorter pressure line especially with 2 tanks spaced apart.,shorter than standard to main tank like 4" instead of 8", and have a 3" to 4" pressure line goin from main tank to header tank.
I see what you're saying. Haven't really noticed any lack in performance... but what do you think of this for a mod?

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXDES1&P=ML

http://www2.gpmd.com/image/s/sulp1752.jpg

FEATURES: Reversible Gear Pump design. Works from 6V to 12V Ultrasonically welded pump head Direct drive prevents slipping Fill-Off-Empty 3 position switch and pre-installed alligator clips

INCLUDES: Sullivan Field Pump for Glow Fuel

REQUIRES: Meduim Fuel Tubing (GPMQ4131)

SPECS: Length: 3-3/4" (95mm) Width: 1-3/8" (34mm) Height: 1" (25mm) Pump capacity 33 ounces per minute at 12V



I'm guessing I can adjust the voltage to the amount of pressure required. So even 4.8v would probably be adequate....

Suggestions?

[overdosed]

unless u really need it i wouldnt suggest to start putting a PUMP on your truck! also means u'll need another battery pack and its prolly gonna make an annoying sound and such

i'll most my quickie mod which i did at 1am in the morning soon!