Glimpses of this engine along with some of the machining of parts are regulars on my instagram posts. Every single part of this engine is taking quite a lot of effort to design and to machine – part of the issue is the deign is in my head and evolves as the build progresses. The trick will be getting this engine to fire and run correctly.
As per lots of my other engines this is being designed and built as I go and so there are no plans other than the virtual plans that exist in my head – the problem is these are sometimes transient in their own right.
The frame has been bolted together with mild steel stretchers, however, I’m thinking of either brazing the joints before final assembly or some small tac welds.
The I section of the beams is quite substantial and this is so that I can drill and tap the beam for fixings.
The crankshaft is described on a separate page as it was machined from a solid piece of mild steel.
The crankshaft has been back in the lathe a number of times to ensure that is absolutely correct and to slightly modify the webs. The image shows one of those times with a DTI being used to align the crank pin.
The original cam design was very modern with a cam drive block that had an outer support. This design had stopped me in my tracks and so the engine had been sat on the side for several months.
The new idea is to use an eccentric cam design, this might be quite tricky to get running and so my first thought is that I need to do some calculations of sinusoidal cam movement versus the more modern cam lift profiles.