Building A Fuel Tank For Bench Running

NEW222 Fri May 29, 2015 8:40 pm

It's me again. I am posting this here as this question will be for both Cox engines, and my loan-a-diesel engine. I will definitely build 2 tanks, one for nitro and one for diesel. But anyways, the tanks I have started building are rectangular in shape. Approximate dimensions are 1" x 1" x 2" (one inch square by 2 inches long). But I was wondering how best to plumb these things for bench running. Basically, how best to situate the fuel pick-up tubes for a SUCTION feed. They are made of heavier tin that will not be used in a plane, so that is no problem. Thank you.

TDbandit Fri May 29, 2015 9:01 pm

For bench running it's best to make the tank re-positionable different engines will have different demands usually a good rule of thumb is to position the fuel feed of the tank as close to inline with the NVA as possible and the tank close to the engine to make it easier for the engine to draw fuel on suction, for hotter engine like a Tee Dee, AME/Norvel with the big venturi you can elevate the tank to a point where it will syphen to help feed these hotter engines this is just an example. I just run either a syringe housing for my TD's or a 3/4 oz hard tank for my other 1/2a stuff and a plain ol Sullivan 1 oz slant RC tank for my 074 through 15, 6 oz for 25 through 50 and so on all these tanks are on adjustable mounts. (Bandit)

roddie Fri May 29, 2015 11:42 pm

Hey New, If you're bench-running reed-valve engines.. they draw fuel very reliably. Just have your pick-up at the lowest point in the tank.. and vent it for filling. A standard size air intake in my experience.. runs fine on an external tank. Diesel Bee's are said to be decent runners.. compared to the Tee Dee/rotary-valve engine.

getback Sat May 30, 2015 9:07 am

Hi New222 , here are some images of setups that may bee helpful , keep us informed . https://www.google.com/search?q=building+uniflow+fuel+tank&biw=1280&bih=577&tbm=isch&tbo=u&source=univ&sa=X&ei=T8NpVfrWCYfioATI24P4Bw&ved=0CCQQsAQ&dpr=1.25

NEW222 Tue Jun 02, 2015 9:44 pm

Ok. So, I just finished off this damn thing for bench running the diesel engine in loan. I was just wondering if you think this will work. Yes, it is ugly and heavy, but it is just for running an engine on the bench. I have attached a line drawing and 2 pictures of the finished product. Details are as follows.
Lower straight tube goes from front to approximately 3/16" from the rear wall. The other tube out the top is bent for filling and ends approximately 1/2 way down from top to bottom. Just for filling. I will make a better and nicer tank shortly when I can hit the store for more tubing. As well, smaller too. Thanks.

Building A Fuel Tank For Bench Running Snapshot_20150602

Building A Fuel Tank For Bench Running Snapshot_20150602

Building A Fuel Tank For Bench Running Snapshot_20150602_2

Building A Fuel Tank For Bench Running Snapshot_20150602_1

NEW222 Tue Jun 02, 2015 9:48 pm

Oh, and if time permits, I will be buying a tank this weekend. There is no guarantee I will even use this one at all either. Just a learning experience as well. I just know that I have to place the pick-up at the right height.

gossie Tue Jun 02, 2015 9:56 pm

That'll be fine NEW.

Perhaps solder a couple of tabs either side so you can screw it down onto the bench firmly.
If it's rattling around it will tend to foam the fuel.

NEW222 Tue Jun 02, 2015 10:18 pm

Ok. Good idea, thank you.

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