Engines > Your Own Design

Dinkus - A Side-Crank Rotary Valve Engine

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PaulR:
Time for the next bar stock monstrosity!

This will be a simple single-acting engine, with a rotary valve at the outboard end of the cylinder. The valve will be turned by offset cranks at each end with matching disks/pins on the end of the crankshaft. The mass of the four crank disks will hopefully be enough to do the job of a flywheel.

This afternoon I got the cylinder and valve blocks to size, and made the bores for the piston and the valve. Also made the air inlet because I found a piece of scrap brass the right size while looking for something else :Lol: I made a separate threaded tube to connect it, so it'll fit flat to the surface without any leaks.

Here are the bits with some piston and valve placeholders. Pretty boring to look at but there we go.  :lolb:

PaulR:
Drilled and threaded the holes for the air inlet passages - really need to shorten that plug a bit though (the long brass rod) :Jester: Also faced the valve to length and drilled the longitudinal passage. Next will be the passage that transfers air to/from the cylinder, the flats on the valve and the holes for some long screws to hold the valve block to the cylinder. Oh yeah, need to turn a spigot on the valve block as well.

PaulR:
Turned the spigot on the valve block (need to sharpen that tool!), drilled the second passage and plugged the first one. Despite putting some thin shims between the jaws and the part I found that they'd marked the edge of the valve hole so I'll need to tidy that up  :facepalm2:

In case anyone is interested in how the air gets in and out... first photo view of the two passages in the valve bore. Second photo, the open and plugged passages into the cylinder.

PaulR:
Made the holes and threaded those in the cylinder block ready to attach the valve block, here held by two temporary screws. One of the holes is a bit out of position; I'm pretty sure I marked it up and punched it accurately but the old pillar drill has a mind of its own  -  this strike rate of 1 in 4 having an issue is typical. Thanks to the orange man-baby my chances of affording a new one are receding further, I'll probably end up with a brace and bit by candlelight at this rate.  :lolb:

PaulR:
Made a bit of progress. Looks more like an early 20th century ice cream cart than an engine.

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