build your own expansion chamber!! plus adjustable header design

[David Luciani]

ok guys,
a extremely good friend has forwarded these pix to me to post.
he told me to also mention this

You might mention in the album that this is an exact duplicate of the pipe as used on my Hornet Marauder back in 1967-68

he'd rather stay private so i'm not posting his name.
those that know who this person is please leave his name out of your comments.

i'll comment on each pix as best i can.

Building the cone
cut cone pattern from flat stock
     
used dead blow or heavy rubber mallet shape on pipe
   
this pix illustrated the holding angle that is best for hand forming a tapered pipe tube
   
partially shaped cone.take you time and form it evenly
   
getting closer
   
you can see here how the angle you've been holding part at eventually lets the edges met smoothly
   
nice even edge ready to tack weld
   
tack pipe every inch or so starting on one end and working you way to the other.the originals (1967) were gas welded but these were welded with tig.
   
short fat cone nearly done

   
fat cone tacked up.note the body hammer.as you weld you can hammer the hot tacks flat if you're reasonably fast.
   
cone finish welded