number-1
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| posted on 5/10/19 at 02:32 PM |
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Tube bending help.....
Can anyone point me in the right direction to get a bit of tube bent for between a supercharger and an intake plenum? Its not an off the shelf
dimension and needs to be in metal
76mm OD tube with 2mm thick walls (can be 3 if easier?), legs can be 15cm long but no longer, however, this is where it gets tricky as i need it to be
7cm from the top of the bottom leg, to the bottom of the top leg...if that makes any sense??? I will get a picture uploaded to make it clearer.
Anyone got any ideas? I cant weld so making something isnt an option and silicone hose isnt suitable.
Cheers
N1
[Edited on 5/10/19 by number-1]
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nick205
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| posted on 5/10/19 at 02:49 PM |
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Don't know about tube bending, but it looks a pretty tight bend to me. Might be something you need fabricated for you from 2 or more sections.
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number-1
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| posted on 5/10/19 at 02:52 PM |
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Hello mate,
Yeah thats what i thought too. Maybe x2 90 degree elbows cut down and left with 3.5cm on each joining leg?
Its probably a simple thing to do if i knew how to weld
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nick205
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| posted on 5/10/19 at 03:33 PM |
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It seems like something an exhaust fabricator could make for you in stainless steel tube.
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mark chandler
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| posted on 5/10/19 at 03:57 PM |
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That,s a really tight radius, tube bender is the person to call
https://tube-bender.co.uk
He will tell you what's possible, if he cannot get it that close you will need to get a bent section off him as close as possible and then have
someone slice it and weld it to tighten up.
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40inches
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| posted on 5/10/19 at 03:57 PM |
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The tightest bends I have seen are 1.5 the tube diameter.
LINK
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J666AYP
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| posted on 5/10/19 at 04:23 PM |
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With a radius that tight I would get two 90's and weld them.
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rf900rush
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| posted on 5/10/19 at 06:51 PM |
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May be worth trying to look for donuts
may not be the correct size but may help the search
eBay Item
https://www.ebay.co.uk/itm/INTERCOOLER-PIPE-MANDREL-BEND-Mild-Steel-3-5-360-DEGREE-DONUT-SEAMED/223062979897?hash=item33ef96f539:g:arAAAOSw9-ldkEVS
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gremlin1234
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| posted on 5/10/19 at 07:20 PM |
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I think the original pic is somewhat confusing,
it mixes cm and mm as units and seems to draw it much tighter than required
a slightly closer to scale, without mixed units might be
 
Description
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Simon
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| posted on 5/10/19 at 07:39 PM |
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Two of these
https://www.allstainlessltd.co.uk/nominal-bore-fittings/nominal-bore-schedule-10-90-deg-weld-elbow-to-ansi-b16.9-316
or
https://www.allstainlessltd.co.uk/nominal-bore-fittings/nominal-bore-schedule-40-90-deg-weld-elbow-to-ansi-b16.9-316
or
https://www.allstainlessltd.co.uk/mandrel-bends-and-tube-for-exhaust/hygienic-90-deg-bend-316-to-bs4825-part-2-1D-polished
welded together
[Edited on 5/10/19 by Simon]
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coyoteboy
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| posted on 5/10/19 at 11:53 PM |
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99% sure that's too tight to bend. Maybe a cast part might work, welded together.
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Angel Acevedo
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| posted on 6/10/19 at 05:14 PM |
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I´d go for Pie-Cutting from appropriate material and sending to welding shop.
As a lot of the labor goes into cutting, dressing and fitting, cost may be reduced substantially...
HTH.
Beware of what you wish.. for it may come true....
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WallerZero
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| posted on 7/10/19 at 06:14 AM |
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You need an 73mm centreline radius (to hit your 7cm (70mm?? Don't mix units lol). If you find some place that can do that, and not break the
bank of a hobby project, let me know, it would probably get me a promotion at work! Haha. Basically its not a normal bend radius so would need
specific tooling to do = ££££.
Best option imo would be 2x 90 degree bends and some fabrication work to achieve your part
[Edited on 7/10/19 by WallerZero]
http://zachsgbszero.blogspot.co.uk/
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pewe
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| posted on 7/10/19 at 05:29 PM |
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Try Rich's Fabrication Shop in Abingdon on faceache.
He seems an all round top welder and does lots of one-offs.
HTH.
#Cheers, Pewe10 
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907
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| posted on 7/10/19 at 08:09 PM |
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quote:
Originally posted by Simon
Two of these
https://www.allstainlessltd.co.uk/nominal-bore-fittings/nominal-bore-schedule-10-90-deg-weld-elbow-to-ansi-b16.9-316
or
https://www.allstainlessltd.co.uk/nominal-bore-fittings/nominal-bore-schedule-40-90-deg-weld-elbow-to-ansi-b16.9-316
or
https://www.allstainlessltd.co.uk/mandrel-bends-and-tube-for-exhaust/hygienic-90-deg-bend-316-to-bs4825-part-2-1D-polished
welded together
[Edited on 5/10/19 by Simon]
2 off of the 3rd one down, cut the straight bits off (+3mm) and weld together.
Paul G
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motorcycle_mayhem
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| posted on 7/10/19 at 08:30 PM |
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I fabricated mine from 'Donuts'.
Available from most outlets, e.g. Merlin where I bought mine (I have no connection).
You might be able to bodge a silicone hose onto a half-cut donut, but not something I'd even try (I weld things).
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Camber Dave
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| posted on 8/10/19 at 07:44 AM |
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For something that tight, I would make a hardwood former and form it as two sides from flat sheet.
Though at 2mm it will need to be annealed so oxy-acetylene or propane will be needed.
Even so it could be difficult to weld in the middle.
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