Avoneer
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| posted on 20/11/05 at 03:53 PM |
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Ali Tank Design - How's it looking?
Right,
Ali tank for my locoblade.
Not injection so no fuel return needed.
One internal central baffle with gap across the top and bottom corners cut off.
Big tube on bottom will be cut shorter and capped and the fuel will be taken out of a small pipe welded to the side of this tube.
The flat cap on the bottom of this tube will be tapped and a bolt screwed in it on the bottom to enable the tank to be drained.
Top and 2" inlet pipe to be welded on yet.
Small pipe for a remote breather also to be welded to the top of the tank near the 2" filler pipe, or even taken off the 2" pipe that will
stick out from the top of the tank.
Pat...
 
Rescued attachment Tank1.jpg
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Avoneer
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| posted on 20/11/05 at 03:54 PM |
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And another pic:
 
Rescued attachment Tank2.jpg
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rayward
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| posted on 20/11/05 at 04:10 PM |
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Pat,
surely the cardboard for the baffle will go all soggy when you put petrol in????
only kidding, looks good when you starting on one for me??
Ray
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Hellfire
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| posted on 20/11/05 at 04:31 PM |
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I think I recognise that tank...
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Avoneer
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| posted on 20/11/05 at 04:34 PM |
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Helfire - it's eaither the one you saw that was held together with gaffa tape, or it's merely the material and welding you recognise 
Ray - would love too, but Tigging isn't something I am capable of and getting my friend to do it as a favour.
Any problems with the design?
Pat...
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Avoneer
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| posted on 20/11/05 at 04:36 PM |
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quote:
Originally posted by rayward
surely the cardboard for the baffle will go all soggy when you put petrol in????
Though of that, but it's ok - it Kellogs and it's glossy.
Pat...
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Trev D
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| posted on 20/11/05 at 07:38 PM |
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tank looks good so far some swaged holes in the baffle will ease the pressure on the welds regards trev
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Avoneer
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| posted on 20/11/05 at 08:22 PM |
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Hi Trev,
Won't that defeat the object of the baffle?
There is a 1" gap at the top and the two corners will be cut out.
It's also all made from 3mm ali and baffle will be welded fully up each side and across the bottom.
Thanks,
Pat...
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tks
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| posted on 20/11/05 at 08:32 PM |
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mhh
you even wouldn't need to completly weld it up...
2 1 inch welds would be plenty..
at least if they are good welded offcourse
Tks
The above comments are always meant to be from the above persons perspective.
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ChrisGamlin
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| posted on 21/11/05 at 12:36 PM |
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If you want to be fancy you could always make up a trap door mechanism in the baffle so it allows fuel to flow towards the pickup, but not away from
it. An aluminium piano hinge with the pivot pin knocked out and replaced with welding wire (to make it a very loose pivot) is ideal
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Avoneer
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| posted on 21/11/05 at 01:33 PM |
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Sounds good Chris, but too fancy for my needs.
Think with the small resevoir on the bottom, it should be fine.
Pat...
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ChrisGamlin
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| posted on 21/11/05 at 02:22 PM |
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Yep, was just saying in case you wanted to be tarty 
The only thing I would say is that a swirl pot / reservoir thats the full width of your tank might be better at catching sloshed fuel than your round
one, if its only half the width of the tank then fuel can pass on either side without falling into the pot, whereas if it was rectangular shape (maye
with an angled base to further funnel the fuel towards the pickup) and all the way across it might be even more effective, especially considering that
the tank will likely be at a small angle when mounted in the car so when low the fuel is likely to run along one edge of the tank or the other, not
down the middle IYSWIM
Chris
[Edited on 21/11/05 by ChrisGamlin]
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Trev D
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| posted on 21/11/05 at 04:34 PM |
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all the tanks i have comeacross at work all have holes in them from gp cars to rally cars.ps i have holes in mine
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Avoneer
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| posted on 21/11/05 at 06:10 PM |
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Hi,
So if I move the small resevoir to the back edge (towards the front of the car and then drill a few big goles in the baffle, that shoulw be fine?
Trev - how about a couple of 50mm holes next to each other?
Pat...
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ChrisGamlin
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| posted on 21/11/05 at 08:06 PM |
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Yep moving it against the front edge would be better,
I would maybe put a few holes in the baffle plate in the top half because if the fuel is that high, it isnt going to surge anyway so no point in
putting lots of load on the baffle plate when the tank is nearly full. Personally I wouldnt put any more holes down the bottom though.
Chris
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Trev D
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| posted on 21/11/05 at 10:02 PM |
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yes two or three will be ok if you dont put any the welds will break trev.
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Avoneer
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| posted on 21/11/05 at 10:43 PM |
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Like this?
 
Rescued attachment Tank2.jpg
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Avoneer
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| posted on 21/11/05 at 10:44 PM |
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Won't it be easier to have a half height baffle?
Pat...
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Rorty
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| posted on 22/11/05 at 03:55 AM |
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quote:
Originally posted by Trev D
all the tanks i have comeacross at work all have holes in them from gp cars to rally cars.ps i have holes in mine
That's a bit obvious - how else would the fuel get in and out? 
I like octagon baffles with a 75mm hole in the centre. Alternate flats are welded to each side of the tank.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Fred W B
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| posted on 22/11/05 at 05:53 AM |
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I would put two baffels in, spaced to be under where the securing straps are to go over the tank. I would be happy with full height baffles with
generous corner cut outs.
Cheers
Fred WB
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Avoneer
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| posted on 22/11/05 at 11:13 PM |
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Don't see the point of two baffles when I have my small extra resevoir (All credit to Rorty for this idea).
Will leave it almost full height and drill one 75mm hole in the centre.
How big for the bottom corner cut-outs? 1" x 1" ?
Pat...
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Rorty
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| posted on 23/11/05 at 12:01 AM |
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If you measure the interior of your tank and cut a square (or rectangle) to suit, and then make it as close as possible into a symetrical octagon, the
size of the corner cut-aways will be proportionate to the size of the tank.
I often use your method of constructing a small reservoir for the outlet, but I cut the tube on a 30 degree slant to accomodate a drain plug.
The outlet is usually about 10-15mm above the level of the drain to avoid picking up crud, and welded into the remaining round part of the tube.
I used to run the minimum amount of fuel to see me through a race and that baffle/reservoir works well with all the bashing around off-road.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Avoneer
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| posted on 23/11/05 at 12:43 AM |
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Octagan it is then!
Thanks Rorty.
My resevoir will be on a slight angle anyway as the ank does not sit flat in the chassis, but there will be a drain plug in the bottom of this tube
and i'll put the fuel outlet 15mm higher.
Thanks,
Pat...
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Avoneer
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| posted on 24/11/05 at 10:46 PM |
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Baffle done and welded in - full bead across the back at the bottom and two 2" beads up each side - one on the front on one side and one on the
back on the other side.
Pat...
 
Rescued attachment Baffle.JPG
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Bob C
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| posted on 24/11/05 at 11:42 PM |
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I have a plan to combine baffle with swirl pot using the arrangement shown in the 'paint' drawing below. Any reason why this shouldn't
work?
BOb
 
Rescued attachment tank.GIF
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%20(WinCE).JPG)
