Step 7: Assembling the combustion chamber - bolting it together
Start by bolting the turbine flange and end cap assembly (the exhaust manifold) to your turbo. Then the combustor housing bolts to the exhaust assembly, and finally the injector cap bolts to the main combustor housing. If you have done everything right so far, it should look similar to the second picture below. If it doesn't, back up and see where you made your mistake.
It is important to note that the turbine and compressor sections of the turbo can be rotated against each other by loosening the clamps in the middle. Different turbos use many kinds of clamps, but it should be easy to see which bolts must be loosened to make the parts rotate.
With the parts attached and the orientation of your turbo set, you will need to fabricate a pipe which will connect the compressor outlet opening to the combustor housing. This pipe should be the same diameter as the compressor outlet, and will eventually be attached to the compressor with a rubber or silicon hose coupler. The other end will need to fit flush with the combustor and be welded into place once a hole has been cut into the side of the combustor housing. It does not matter so much where the hole is on the side of the combustor, so long as the air has a nice smooth path to get in. This means no sharp corners, and keep the welds on the outside. For our combustor, I chose to use a piece of 3.5 inch diameter exhaust tubing which was mandrel bent. The image below shows a hand fabricated pipe which is designed to get bigger and slow the air down before entering the combustor.
You should now have a nice clean path for the air to take all the way from the inlet of the compressor, down the pipe to the combustor, through the exhaust manifold, and past the turbine section. Everything should be pretty much airtight, and you should check all welding to make sure that it is solid. Blowing a leaf blower through the front of the engine should cause the air to flow through and turn the turbine blades.