Yah, I asked how to do a specific cast iron repair on an engine block I spent $7000 rebuilding a few years ago. There is nobody on the planet that knows everything about welding or the best procedure for each application. I worked on tanks, skids, piping, vessels and oilfield equipment. Not too much cast iron or engine blocks. Don't know what that has to do with the topic of transferring acetylene from a large to small cylinder though.
Acetylene generators are used to make acetylene. Back in day shops had acetylene generators but they were banned because of too many serious accidents. There's also a BIG difference between using something with built in safety features than making your own setup. How do you measure how much acetone is left in your cylinder? Acetylene is filled by weight, not pressure. The amount that can be put in is dependant on how much acetone is in the cylinder. That's why a lot of larger acetylene cylinders have a sticker showing the cu. ft. or cu. meters of acetylene in the cylinder. I toured a fill plant and we couldn't even go into the acetylene room. We had to stand outside the door because you had to have fireproof clothing. Acetylene isn't something to experiment with and I really hope no one else tries to fill their own cylinders. Below is from your own link you posted: Although it says from a torch, there isn't much difference if it came directly from the cylinder. It's still unburned acetylene gas.
NEVER DISCHARGE UNBURNED ACETYLENE GAS FROM A TORCH INTO ANY TYPE OF CONTAINER OR VESSEL.
When unburned acetylene gas is discharged from a torch, static electricity can be generated at the torch tip. If the tip comes in contact with a ground path, a static spark capable of igniting the acetylene can occur.
npalen, compressed air won't do anything. It would probably blow the flame out. You need pure oxygen.
Give it a shot & tell us what YOU think. If it bombs we can always take up a collection to cover you investment. 
