I had a WTB up but I guess I put the wrong size up I wrote 13 well to goal is to make a larger tank so we can make it a full 2 hours in the 24 hours of lemons instead of stopping every 1:15 to 1:30 the plan is to take a 12 gallon tank get a collector put in side it. Cut the 2 tanks in half not actually but leave a 1/2 inch on either side over the middle mark. Cut off the side things that stick out weld the seams on the inside than the 2 tanks are going to be spliced together to make it 1 inch wider, the whole way down. Anyone know the calculation on volume increase on that?[/b] The vent tube will be moved to the top fill moved to the top and pretty much thats it I have not been under our car for a long time any one see a fitment issue with that?? In case anyone wonders I have tried the aluminum tank it sticks down too far and would drag on the ground so thats not good I was also afreid of the sharp edges on the tunnel with all the stress and bumps the car gets. We run an avarage of 1800 to 2200 miles in 24 hours so things dont like to hold up in those conditions! Thanks!!
If you use two existing tanks, take a measurement of the room you have in the tunnel on the sides, and the leeway you have on the bottom. Cut the tank on one side of the top vents, with about an inch or so to spare. Then cut the other tank right beside the vents and use that piece to weld to the the first tank. This should give you at least one inch wider or thereabouts.
If you are fabricating an aluminum tank, which is likely the nicer option, you simply measure the space it will be filling, allowing for rubber spacers. The rest is pure fabrication.
There may be a guy on the forum though, who has done all this.
The only way to measure the volume is to build it first. Getting a volume on a curved panel is very tough mathematics. You are better to fill it and empty into a known volume container to measure the interior space. Hope this helps.
There isnt much space where the tank fits.What engine are you running? Have you thought about swapping out engines for an economical motor? I was at the wrecking yard some time back and saw a Camaro motor with 2 fuel injectors in the intake, instead of the usual 6 injectors, it only had two. It would be interesting to know what kind of gas mileage that motor got.How about an extra tank (from a diffrent car),in the trunk compartment?
[This message has been edited by James Bond 007 (edited 01-20-2014).]
A secondary tank at the rear of the car would be a safety concern... but how about in the front? Front impact tests on the Fiero were very good. Crash tests included the spare tire as part of the crush system, but I have yet to see a smashed Fiero that impacted the tire. If you don't have to carry one you could build a tank of roughly the same size and shape.
I had the idea a while back to run a small fuel cell up front and connect it to the forward tip if the oe tank, and maybe run a valve or a small electric pump to transfer the fuel. i don't know what your sanctioning body rules are on that.
231 cubic inches equals a gallon. LxWxH gives sq> In. I know the tank is wedge shaped in every direction but the math is pretty easy to do. You average the tapered sides to create an equal sided rectangle. As Arne stated the final proof is in the fill. Hard to calculate the unfillable air space at the top. I an sure you won't be able to widen the top of the tank (no room), the bottom - yes. If you fab a 24x5x4 rectangle to add to the back of the tank running width wise like the engine (transverse) it will add 2.07 gallons. There is plenty of room for this. It can be wider that 24 inches and deeper than 4 inches for even more gas. Not nearly as much welding as the "cut the tank in half" thing. Because it's at the bottom back of the tank you know exactly how much gas it will hold. My stainless tank is coming along fine. Machined the sending unit/pump holder today. Now onto the baffle design. Best of luck on your project.
Based on my calculations we will get 1.65 gallons extra which should give us 18 minutes ore if the fuel pick up relocation gets all the fuel tot he engine it is a 3.4 DOHC
That sounds about right. The drawing I have for a longer taller tank is 1.99 gallons for 1" wider.
I don't know if you are starting with the smaller or larger tank, but the larger one is already tight to the sides up top and the side flange is already bent down. There might be room at the base to widen it some (by removing the heater and A/C lines).
I have the chassis sheet metal from the center tank cut out and under the house. One of these days I need to throw a tarp over the opening and see how many gallons it will hold. That will tell us the upper limit of any gas tank in that area.
I have the foam mock-up tank made. It is longer, wider and taller. It fits very nicely. I have some of the stainless sections made and they fit snuggly but they aren't jammed in. It's kind of slow work because a lot of the sheet metal equipment I have isn't heavy duty enough. I have to improvise which takes a lot more time. I fit the new sending unit/pump holder in today and got the pick up extended to the tank depth. I had to revamp the float arm to get it to swing a longer arc. It looks promising.
I have been taking pics right along. I have had some trouble with posting pics here in the past. I'm going to put a bunch of pictures in the forum when I get to the point that I can say for sure everything fits fine and is installable. I am making the tank in 3 sections and each section independently fits fine. They might take some messaging when they are tacked together. I have baffle work to do. I am putting a baffle on either side of the pick up with doors to keep the gas where it needs to be. I'm working on the fill tube/vent line and baffles today. Doesn't look like I will finish them today - it's my wife's birthday. She already made me take her out for lunch - said something about me making supper - and made me walk a mile with her at the health club. No wonder this is taking so long.