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 hydra forming exhaust

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dansofield550

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Number of posts : 362
Localisation : gravesend kent
Registration date : 2011-10-23

PostSubject: hydra forming exhaust   Sat May 23, 2015 12:30 am

has anyone done it to make an exhaust , im interested at having a go and wondered if there's any correction data as regards sizes etc
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mm_tribsa

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PostSubject: Re: hydra forming exhaust   Sat May 23, 2015 12:55 am

Lots of stuff on youtube Dan regarding this topic, doesn't look easy Wink
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Trevor Amos



Number of posts : 873
Registration date : 2010-08-13

PostSubject: Re: hydra forming exhaust   Sat May 23, 2015 11:24 pm

Word of advice Dan, try a header pipe first ,Mike is quite correct to suggest it is not easy. You might also want to give some thought to the wire spec you use, the flat joint is subject to a lot of flexure when you blow the thing up, easy to crack the joints.

If you do go ahead could you document the whole process, together with a few pics, it will make a great topic to install into the new manual, pioneering stuff!

You might also think about the commercial consequences of perfecting manufacture, a lot of people would eagerly buy a Bantam header pipe, of the correct dimensions?

There are some compelling reasons why a fully blown pipe doesn`t give the results a separate cone pipe does. Blown headers can`t be bettered however!

Trevor
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dansofield550

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PostSubject: Re: hydra forming exhaust   Sun May 24, 2015 12:17 am

The header section was my main thought Trevor
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Trevor Amos



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PostSubject: Re: hydra forming exhaust   Sun May 24, 2015 8:13 pm



I did a bit of ferreting around and discovered this image of work in progress. I was particularly struck by the butted joint faces being curled parallel together prior to welding, and inflation. As they say a picture and a thousand words?
Hope it helps!

Trevor
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dansofield550

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PostSubject: Re: hydra forming exhaust   Mon May 25, 2015 5:26 am

Yes the ones I've seen have that too, about 5 mm on each part does the trick make the weld in the correct direction
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john bass

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PostSubject: Anyone got a pic ...   Mon May 25, 2015 8:21 pm

Has anyone got a picture of the proper finished article -- I canīt recall ever seeing other than pipes with lots of messy looking welding ...

....`RECALLīdid I say -- now what does that word mean? --- humm de hummm what on earth is my name ....
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Trevor Amos



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PostSubject: Re: hydra forming exhaust   Mon May 25, 2015 11:31 pm



Here you are John, the finished article,
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john bass

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PostSubject: Amazing ...   Tue May 26, 2015 4:18 am

Thank you, Trevor --

Amazing!
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john bass

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PostSubject: Second thoughts ...   Tue May 26, 2015 5:50 am

Second thoughts ...

Looks too smooth for the Shock-wave to be a shock wave. The parallel portion seems to be bloated but probably
not sufficient to effect the resonance....

Science conquers all -- including doubting feelings.

Cheers!
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adam p



Number of posts : 63
Localisation : fakenham,norfolk
Registration date : 2011-03-23

PostSubject: hydro forming exhaust   Tue May 26, 2015 6:36 am

i think alan brown has hydro formed a header pipe in the past, i could be wrong.
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Trevor Amos



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PostSubject: Re: hydra forming exhaust   Wed May 27, 2015 5:05 am

Spot on there John, the smearing of the angle junctions is going to mess with the timing of the pulses being generated, kinda negates the whole purpose in the first place. Just about the only reliable dimension would be the tuned length!

Maybe Alan has Adam, I don`t know, maybe he might care to confirm and offer a few hints and tips to prospective header makers? I do know that Derek has made a couple of attempts with reasonable success!

Trevor
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