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Old 30-08-2018, 07:54 AM   #1
gazwad
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Default titanium exhaust

my maniflow twin box exhaust is quite heavy due to the extra large boxes etc although it does flow well and sounds good. this got me thinking if there are lightweight alternatives. A bit of googling brought up some makers of titanium exhausts but nothing specific to the mini or even universal boxes/pipework to make your own. Has anyone had experience with titanium exhausts? Are there any mini specific ones available?
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Old 30-08-2018, 08:00 AM   #2
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I made one a few years ago for a friend, He just bought the bends required. It was rather expensive though!
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Old 30-08-2018, 08:03 AM   #3
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yeah i'm not expecting it to be cheap! what silencers did you use or did you make those as well?
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Old 30-08-2018, 08:05 AM   #4
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My step brother just had one made for his Ferrari 355 track car, think it was about 6k

He says that was quite cheap lol
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Old 30-08-2018, 08:07 AM   #5
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Quote:
Originally Posted by gazwad View Post
yeah i'm not expecting it to be cheap! what silencers did you use or did you make those as well?
The plan was to make one but he sourced one from somewhere, it wasn't a Mini box, it was off a titanium system from another car. It was amazingly light!
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Old 30-08-2018, 08:41 AM   #6
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Default titanium exhaust

What about Inconel?
Itís not quite as light as Ti but itís still lighter than stainless.
I know Simpsonís will make you an Inconel system, Iím sure others will too.


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Old 30-08-2018, 09:10 AM   #7
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What about Inconel?
It’s not quite as light as Ti but it’s still lighter than stainless.
I know Simpson’s will make you an Inconel system, I’m sure others will too.


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Expect it to be very expensive, it's a tough material to work with due to it's high work hardening factor (machining inconel requires aggressive slow cuts with very strong cutters - usually ceramic $$ with around a 5 min tool life - think bin and replace at that frequency) And is prone to cracking and segregation at the microstruture level when subjected to high heat, so welding is difficult at best and require a lot of skill.

Still the material properties of Inconel lend it very well to exhaust systems as it has unprecedented corrosion resistance when heated (forms a protective layer) And performance over a huge temperature range, which is why you find it in F1 and etc where budgets are mahoosive.

Likely it would cost more than a brand new mini shell itself and then some... But if you're a bit mad go for it

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Old 30-08-2018, 09:35 AM   #8
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Just saw a thread about a BMW M3 system costing circa £4k!, I realised it was difficult to work with but Iíd have guessed it would be cheaper than Ti in materials so I assumed it would balance out, but clearly itís much harder to work with than I assumed and the labour and tooling costs make it a bit rich for a road car!
How much weight are you wanting to lose Gaz? IIRC you have a mild steel system, a stainless system would make a reduction in weight as youíd be able to use a thinner gauge tubing etc., obviously not near the reduction youíd gain from Ti, but it would quite a bit across an entire system.



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I love it
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Old 30-08-2018, 12:14 PM   #9
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If I can find a reasonably priced titanium silencer i could be tempted to give it a try. My exhaust must weigh around 30kg as its the biggest boxes maniflow do and is quite thick gauge mild steel. I like how quiet it is at cruising speeds so don't want to use smaller boxes etc, thinner gauge stainless might be an option but only if the weight saving is worth it
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Old 30-08-2018, 12:25 PM   #10
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Iím happy to start saving toilet roll tubes for you if you want another lightweight alternative?


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I love it
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Old 30-08-2018, 12:28 PM   #11
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I might just drill lots of holes in it, that's what the youtube 'cozracecar' experts would do
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Old 30-08-2018, 12:33 PM   #12
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One word, 'Slimmingword' lol
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Old 30-08-2018, 12:55 PM   #13
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I wonder if Aluminium could be used in some capacity.

It's brittle and work hardens so can't really be mandrill bent, it also melts at 600 so no good for a header either. It welds itself to steel (not a bad thing here).

You could build a backbox out of it and maybe do the long straight sections in ally, just have the bends in steel and v-bands or straight boggo exhaust flanges & doughnuts to join steel to ally.

That's my brain fart for the day. Pardon me.
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Old 30-08-2018, 03:06 PM   #14
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Quote:
Originally Posted by edk83 View Post
My step brother just had one made for his Ferrari 355 track car, think it was about 6k

He says that was quite cheap lol
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Old 30-08-2018, 05:14 PM   #15
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The alloy back end is brilliant idia,
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