Years ago with new engine install in falke I was required use a multi gas tester in the cockpit (got from Gold Coast council sewerage dept) and it showed up think 140 parts per million (ppm) CO and as far as I remember the max in aviation is 25ppm. We had one of those 3 colour CO tester in cockpit and it really showed nothing thus I have little faith in them.
We extended the exhaust and totally sealed up fire wall and it was then down to either 11ppm or 13ppm. Now I notice this Saturday Aldi have an electronic CO sensor and warning (much like smoke alarm) for $19.99. I am going to get one and at least see where they trigger. While I think of it most 4 stroke engines I have had something to deal with I have the engine pipes coated with ceramic coating. Think each pipe in Limbach was $45 ea. so not much to pay to reduce heat floating around the place. And the 3rd thing if you need engine pipes rebuilt (aviation welder can only repair so maybe the only part he uses again is a flange!!). I made a plaster mold of each pipe in a shoe box with flange facing down. Welder was able to totally rebuild and they were a perfect fit in mold and then perfect in aircraft. Bert Flood imports has a full donut SS as used to rebuild rotax 912 pipes and these are perfect for most engines. Finally I always feed a jet of air onto the slick magneto or any electronics for that matter. They all hate heat. Years ago my magneto LAME had to scrap a Slick out of a Dimona. He also hates the 5K ohm (or is it 10K) NGK resistive caps and showed me why on magneto spin up testing. Gather they are a European requirement for to stop engine nose. I like a BIG spark like the good old days. Hope this is helpful Ian McPhee
