build your own expansion chamber!! plus adjustable header design

[David Luciani]

ok back to the thread and it's original intent. i posted more pix back a page or so showing the jig items and pix i lacked.
heres another comment from builder.

Hi David,


Use the photos you think will help people. t's not that difficult to expand the tube section without form tools. I did it with hand tools and a torch back in the old days. The tools just make it quicker and easier.  It doesn't really need the stepped tool that holds the tube when the ball is pressed in. I've done it with and without that stepped tool. 

I'll send you the dimensions of that pipe. I can send you a pdf of the cone lengths etc. I can probably send a pdf of the pattern that others could have printed full size if they wanted to build that pipe. I'll make new drawings that have the proper taper to use an inlet that fits the flex used in that era. The current pattern has a slightly different taper to make it easier to fit the flangette on the end. I still flare the inlet end of the pipe with the ball bearing a little. The main thing is that they would need to remember that it's a true late 60's pipe and not some later and better design. I never had a tach, so I have NO idea of what rpm I obtained when running it and I was running enduros, so the tuning was for that application. Adjustments in length were made and then checked with a stop watch. That pipe might suck when used with a slipper clutch. I sold the pipes to Inglewood Kart Shop as well as Wilm's Kart shop. Their customers may have used them on sprint karts. I only sold pipes, not headers.

Try getting the cone pdfs printed at a place like Kinko's to see if they print correctly. 67cone1 and 2 are for the pipe using the bearing. The others are resized to allow for adding a straight inlet that will accept regular flex. It's smaller at the inlet end than the one for the bearing. If they print correctly then feel free to include them in the photo series. It would make it easier for anyone to build that same pipe. When rolled they should end up at 4 inches in diameter at the largest end. I think the long one is about 13.50 inches long and the short one is about 5.75.