Exhaust pipe manufacture?

[hotrodder]

I know they do other stuff but Maniflow is a name i pretty much associate solely with Minis and other BMC/BL stuff

 

[Brad93]

I've just started doing some welding for a firm Gibson Exhausts. They do everything from pie cuts or sheet steelsteel.

 

[Chris Stevens]

I've just started doing some welding for a firm Gibson Exhausts. They do everything from pie cuts or sheet steelsteel.

Thats interesting.................they used to do lots of 2T exhausts back in the day, but think the firm got sold and someone else running it now?

 

[Rocketman]

If you were near custom chrome it would be worth asking them

http://www.custom-chrome.co.uk/retailshop.html

Bit of a long way from Southampton.

 

[Chris Stevens]

Thanks for that link, prices seem very good and custom bends seem easily available. Might be that area next week to pick up a bike.

 

[Brad93]

Thats interesting.................they used to do lots of 2T exhausts back in the day, but think the firm got sold and someone else running it now?

Yes guy called Tony running it. Nice bloke.

 

[super noob]

JP Exhausts sell tight radius bends at a good price

 

[HMB]

I've just started doing some welding for a firm Gibson Exhausts. They do everything from pie cuts or sheet steelsteel.

Are they in Harold hill on the potato farm?

 

[Chris Stevens]

JP Exhausts sell tight radius bends at a good price

I have found 1D about the tightest rad available..............can they do tighter at all?

 

[Shox Dr]

Maniflow may be up there, especially with regards to value for money for some of their products for classics, but in absolute terms there's quite a few others about like OJZ, Alunox, Chris Tullett, Primary Designs, GoodFabs etc
I wouldn't be suprised if Akrapovic are using DMLS, at least for prototyping, alongside hydroforming and various pressed and cast parts

Laser sintered collector and some other components getting assembled into a GoodFabs exhaust...

and a 4-1 made from two pressed halves http://www.goodfabs.com/bends-and-pressings/pressing.aspx

Interesting vid Pete. Doesn't show how they weld the collector to the pipes, or do they?

 

[hotrodder]

They won't weld the collectors on. Thermal expansion provides enough of a seal* and if/when they need more mechanical security it's usually done with tabs similar to the spring clips used on some bike cans but without the springs for example

so that collectors and primaries can be mixed & matched to fine tune characteristics etc.


* 'Double slips' are a better way to get a reliable seal while allowing for a tiny bit of movement to relieve expansion/contraction stresses for us mere mortals that can't afford to use ultra thin wall inconel and/or throw exhausts away regularly. Especially with turbo applications. The inner tube gets hotter/expands more than the expanded section of the tube that slips over it. The outer sleeve expands even less improving the 'grip' as the exhaust heats up... https://www.google.co.uk/search?q=e...ved=0ahUKEwjAnNWcpqLJAhWMWhQKHRolBoEQ_AUIBygB

I have found 1D about the tightest rad available..............can they do tighter at all?

Dunno know if it's even possible with materials like 304L at the wall factors used for typical exhaust bits but i doubt you'll find anything tighter than 1D CLR anywhere. If they do exist i'd hate to think how thin the wall gets at the outside of the bend due to the amount of stretching needed

 

[Shox Dr]

Doh!! Of course

(I'd like to say I was 10 bottles in when I posted that question fella.)