Twin Rotary Valve Engine

[PaulR]

Started another project while cogitating on the crank+eccentric uniflow idea, this one is a bit more straightforward: a twin single acting rotary valve engine with Scotch yokes driving the crank.

Made the cylinders from old towel rail tube and 5/8" brass square with mild steel pistons and temporary rods. Made the two valve blocks, the simple cranks and the flywheel. Need to find a piece of steel (or brass) the right size to make the long inboard cylinder support and a piece of sheet for the base.

[PaulR]

Made the yokes today. The vertical slide was bouncing around all over the place for some reason, maybe the slot drill is a bit worn or I just have the speed right? Anyway, the slots needed considerable attention with a file to bring them anything like straight. They're wider than planned so I'll just make the pins a bit fatter 

[PaulR]

Made the crank pins and washers and the inboard cylinder support - drilling the 1/2" holes for the cylinders was quite thrilling on the rickety old drill press but it came out alright even if my garage was full of burnt cutting oil fumes! Here are the bits placed together - the two copper air tubes will go through those holes in the middle down to the brass valve blocks. Man it's an ugly duckling and the blocks to guide the rods from the yoke have to be made yet.

[Sanjay F]

I think 'interesting' rather than ugly! Coming along nicely following along