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As a retired teacher of metalwork etc., I am impressed - welding is (to me) very much a black art!
I'm guessing you've already found this:
http://www.vintagebikebuilder.com/jennings-two-stroke-handbook.html
page 51 et seq.
MrE-
Thanks, they're still a bit shite but I can work on that....I've seen worse on bikes.
I remember reading that Jennings book when I was a kid (shortly before ruining my AR80 motor... :))
Gordon Blair at QUB did a load more work subsequently too.
I've a mate with a copy of this - https://vannik.co.za/EngMod2T.htm - so will use it once I'm ready to make a proper set. Lots of very detailed measurements required, so I need a motor to play with. Most are straightforward but calculating crankcase compression looks a bit fiddly!
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It only took a whole year, and a second prompt on here, but I actually own a very fresh copy of the book now!
Jung
pdlouche
Pretty light - it’s 20ga so only .9mm thick. Generally considered the thinnest you’d use for a two stroke pipe to keep enough strength.
I had no welding experience at all until recently! I picked up a torch secondhand and have been practicing. It is a very satisfying process - getting better all the time.
This is cold rolled steel. You can use stainless and it’s not much different to weld but you need to use a flux for gas or a back purge of argon for electric. It’s also more brittle and prone to cracking for two stroke pipes.
The tubes are all rolled out of flat stock. I print a paper template on the computer and cut them out with snips or a shear. Then roll them slowly around a bar in the vise until you can weld down the seam to make the cone.
The really interesting bit is all the measurement and stuff required to work out the correct angles and lengths for the various cones. Didn’t do any of that yet as this is just a test piece.
Have a go!