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Good 8mm pipe beunder?
the_big_1 - 7/9/19 at 05:17 PM

Hi guys,

Trying to ben 8mm kunifer fuel pipe but the tool I have is ruining it. I am getting ripples, kinks etc
Anyone recommend a tool you have used etc?
Only have about 3 bends to go lol

nick205 - 7/9/19 at 05:33 PM

On my MK Iindy I did all the pipe bending by hand. I didn't rush and didn't force, just worked slowly and smoothly and concentrated. The end result passed SVA and looked perfectly OK. I used a Draper flaring tool of my Dads, which worked well and didn't leave any leaks.

the_big_1 - 7/9/19 at 05:36 PM

Hi,

Not tried by hand, worried it would kink.
Used 8mm olives soldered at the ends for the rubber.pipe and proper fuel clips.

big_wasa - 7/9/19 at 05:45 PM

I find working it a little at a time by hand best. I tried doing it in alloy, this was way to soft. I’ve know done it in braided ptfe. This cost a bomb and has its own issues.

the_big_1 - 7/9/19 at 05:47 PM

Might try by hand tomorrow, the nerves lol lol

big_wasa - 7/9/19 at 06:10 PM

Yeh I trashed a full roll of aluminium.

the_big_1 - 7/9/19 at 06:12 PM

Lol that's my worrie. On the last bends of a £50 roll or brake pipe lol

daviep - 7/9/19 at 07:26 PM

What tool do you currently use?

I use a cheap Clarke thing like this and it works fine.
https://www.machinemart.co.uk/p/cht264-3-in-1-automotive-pipe-bender/

Cheers
Davie

r1_pete - 9/9/19 at 11:38 AM

I've got a cheap ebay alloy bender, used it on several builds for brake and fuel pipes, produces good even bends..

like this Heavy duty is pushing it a bit but for 8 quid its served me OK.

preparation - 16/9/19 at 07:54 AM

I doubt you'll find anything off the shelf with that CLR, off the top of my head i'm thinking partly because at that tight of a bend radius excessive ovalising (at least) is gonna happen without something inside the tube to support it? And partly because off the shelf dies often work in terms of tube diameter for CLR i.e. 1.5D bend (12mm CLR for 8mm OD), 2D etc and when they don't it's usually because it's the tightest CLR that'll produce clean results repeatably without mandrels or, for smaller diameters, faffing about with bend resins/cerrobend etc

http://imperial-tools.com/products/tube-bender various models, good gear & available in the UK from various HVAC suppliers but they don't go tighter than 11/16" (~17.5mm) CLR for 5/16" tube. I can't recall ever seeing any off the shelf dies that do tighter CLR than that, affordable or not.