Forming Header Starter Tube

[Eric]

To all:

I believe I saw this posted here on this site, but cannot find it, so maybe I saw it in a magazine article. Somebody had a photo/description of a tool they made to create the rectangular section of the header tube that attaches to the header flange, using standard round tube. In other words, they made a tool to create the rectangular-to-round transition as the starter tube for the header. Anybody know where this post is?

The site's search engine and I are agreeing even less tonight than we usually do. Thanks in advance.

Eric

 

[Jac Mac]

It was one of the Aussie members, & I think it was on his build thread IIRC, hope that narrows it down enough...

 

[Gary Marshall]

This could be the link.
http://www.gt40s.com/forum/gt40-tech-engines-induction-exhaust/24933-crossover-exhaust-question.html

 

[Fred W Ballinger]

Deleated - miss read original post

 

[Andy Green]

I used the following mandrel to make my stub pipes shown here:

http://www.gt40s.com/forum/gt40-build-logs/24109-norfolk-tornado-5.html#post296511

Basically it was turned as a snug fit into the exhaust pipe and the flats ground onto it. With the first pair of flats pressed/hammered to the former shape, a g-clamp was put over them and the second pair of flats formed, effectively pushing the material into the corners

It took a bit of fiddling to get the mandrel correct, but after that they only took a few minutes to make each

Hope this helps
Andy

 

[Eric]

Gary

That is exactly the post I was trying to find. Thanks.



Andy

Looks like you did basically the same thing. For the header flange, what thickness of steel did you use?

Eric

 

[Andy Green]

Eric,
I used 10mm, but in hindsight 8mm would have been OK

Have fun
Regards
Andy

 

[Woody]

Hi Eric
Just another approch
This is a tool I made for the same job, but kind of works back to front from the one in the post you were looking for.
Its milled with a tapper to fit into the round pipe and tappers back to the flange size, in this case a FE. I clamped two pieces of timber into the vice and drilled a 1 3/4" hole into each half of them. this acted as two halfs of a clamp. Then heated the pipe and used the tool as a dolly and hammered it into the hot pipe. With a little care and a lot of practice this will forge a nice tranision from round to square or rectangle.
I hope this helps
Woody