15th August 2014 - Right side Exhaust fabricated

I've decided to build a 2-pipe exhaust system with cylinders 1 and 3 feeding into one tailpipe and 2 and 4 into the other. This isn't as efficient as a crossflow system (1 & 2, 3 & 4). However,it is much easier to construct. The system is made from the mild-steel custom exhaust build parts available from jetex.co.uk.
As a start, I bought 2-each of 1m straight , 90 degree bend, 60 degree bend, 45 degree bend, and 30 degree bend.
Then it was a case of slowly fitting and cutting the sections in an iterative fashion until a route was established that cleared the cowls and routed out of the slot in the bottom of the lower cowl.
In the event I used a 90 degree bend off cylinder 1 connected to a 45 degree bend to angle the exhaust in and down. A 30 degree bend was used from cylinder 3 which was fit and welded to a machined hole cut in the 45 degree bend (took over a couple of hours to get a matching hole and end-profile). Next a section of straight pipe was welded on. This will take the hot air box for the cabin and carburettor heaters. Finally another 45 degree was used to create the tailpipe angling the exhaust down and away from the fabric under the fuselage.
I still need to make a support for the rear of the exhaust. This has to be connected to the engine rather than the airframe so that as the engine moves on the mount it doesn't stress the exhaust.
The routing for the left side will be similar but because the 2 and 4 cylinders are more to the rear a sharper angle will be needed before the straight pipe and this will also be shorter. I think this means that worst case I will need to buy two extra 45 degree bends, best case is just one more.