This is held onto the base plate by a clamp, to allow easy replacement. The swirl vanes are short bits of 1.6mm sheet, wide enough to fill the gap between the base plate and the top of the inner combustor liner, and long enough to reach from the outer skin to the flame tube. All the parts used are stainless steel, and were obtained from a scrap metal dealer. The flanged outer tube was a lucky find, as is save a lot of time in mounting the base plate. This is held onto the main unit by 6 M5 bolts.
Ignition is accomplished by means of a spark plug extending into the inner chamber at the front.
This was eventually tack-welded in position, as I was unable to obtain a suitable nut to fit it. The entire combustion chamber mounts onto the turbo by means of four M10 bolts. The total cost of the combustion chamber was about 25 UKP, which included enough extra tubing to make at least two more similar units. In operation, the combustion chamber produces a strongly swirling jet of flame, extending about 5cm past the manifold fitting under full fuel flow. The outer skin of the combustor is insulated and cooled by the incoming air flow, and stays cool enough to touch for some time in operation.