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I must be missing something, with no forced induction to the crankcase, what keeps the air mix from bouncing from retreating pistons to extending pistons? Is their valving to lock the charge air under the retreating piston so that it is forced into the cylinder? If not, wouldn't it just flow...

Benefit of going DC to AC is no rpm wander which translated into HZ wander and if you buy a sine inverter, it's easier on electronics.

Real world is a bustard. I'd go oversized on the motor, so it has the ability to self cool while staying away from it's SF rating. Good news that the pump is working well. At least, it sounds like, you could run the pump in at the lower pressure and lower rpm and either end up with it already...

That's awesome! The brass pistons look like they were starting to gall a bit.

Nice! Well sorted. Does the water stay out of the oil now? 500psi is a nice mile stone.

Love the sound.

Maybe a heavier weight oil? Like a 40 weight?

The pulses have inertia, so you might be seeing water hammer as needle vibration, which is to say that the flow might possibly be smoother then it appears. So long as the volume is right I'd be tempted to hook everything up and see how the turbine responds 😄

Nice! That needle is way more under control now!

I have a variable torque set up. High end treadmill motor with a built in encoder. The result is that if I start a ⅛ deep cut in mild steel, my lathe's max, the controller will up the juice to maintain the speed. It's very useful.

If you get some rare woods like birds eye maple, you could sell the veneer to buy more stuff to make engines 😉

Oak is ridiculously great to solder on, once charred it is the perfect insulator, just spritz with water after each job. Failing that, four fire bricks, the good kind, work wonders. Have two lie flat with two vertical to form a back wall with a corner to reflect heat. You want the dense...

Ah, the famous "tighten the screw till it strips then back it off ¼ turn" approach ☺️😉

Cooling/heating parts respectively can help with interference fits

From the looks of your cylinder liner, you plan to have cooling? Forgive me if it was mentioned but are you fitting a coolant pump? Will you eventually add a demo load like a generator to the engine, or will it be a very large tabletop proof of concept engine?

Were the bubbles from just starting the pump or was the pump generating them from gas pulled out of the water? Might have a problem with the pistons pulling vacuum on partially filled chambers and pulling air out of solution and sorta chewing on it till it gets expelled. That might suggest the...

How many rpm was the video? Is the line closer to the camera the input?

Generally dig about the mushrooms base and see if it swells below the ground like a bulb AND has a skirt, if yes to both it's probably deadly. The lack of a bulb doesn't mean it's safe but finding it and a skirt generally mean it is in the destroying angel family. Rumored to be very tasty yet...

That's an excellent question, I would say runs smoothly, starts easily in this context. Then it can power a scrubber to remove NOx and particulate 😛

Curious too, how do you idealize timing on a model engine, EGT or just by looking and listening?