How Does it work???

Its Shiny;)

All i use is a normal BBQ ignitor, No batterys nothing. Works like a charm

Try and get HDPU(High Density PollyUrethane) it is rated at 100kPa

I use them in my combustion cannon, Great fun when you Freeze old Cellphones That just wont die! i use them in all weather, here in South Africa its never that cold

Where can i get, or make a air to feul meter?

i just glued the one adaptor to a small piece of pvc, then glue that onto the adaptor(mine is 110mm to 50mm) then you put the matching adaptor onto your barrels

Stupid question but how would you mount the motor to the Chamber?