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Intake is a ball valve that is held close by gravity and opened by vacuum as per Jan Ridders design. It might be a bit too loose in the seat i.e. too much vertical space causing it to bounce. Is one of the risks of this type of valve as Jan Ridders also mentions. I can still adjust the free...

Adding more fuel in the "carburetor" improved things greatly. Even got several minutes of consistent firing. Unfortunately no movie of that. This is 2nd best with an occasional misfire. Not bad.

As my "Ridders vapour carburetor" seems to be an issue in running my new (and first) engine, I'm looking for a carburetor plan. Does not have to be a throttling version. A single, well running RPM is all I'm looking for. No vroom-vroom for this engine. Engine is a 1 inch bore x 1 inch stroke...

Got it running twice for about 30 seconds but then it stops. Does not run consistently and it sounds as if it has not enough fuel. Increasing irregular firing and then slowly dying. Tried a rather small version of the "Ridders vapour carburetor". Now looking for plans of a simple but...

Ignition cam finished. Heavily overdimensioned fixation lugs, but by that historically correct 😉

Not that I know. The advantage of these clamps over using a key is that you can fix the parts really well by pinning (gear to flywheel and cam to gear) while still allowing to set/adjust timing later by rotating the flywheel over the crank shaft. The "disadvantage" is indeed that you need to...

Cam and push rod finished. Only have to add a rocker arm and ignition cam. Compression looks to be sufficient but not so high that it is too hard to overcome.

Drilling, threading and milling the tapered clamp for the 2nd flywheel

First tapered clamp in place. Even with only four M2 screws, the clamping force is impressive. The extra 2 holes (one visible) are M3 for pushing the bushing out of the flywheel and release the clamping force.

How did it go bad? Did it crack, crumble or loosing its ability to insulate electrically. How many hours of running did you get out of it?

Very nice. How big is the gap between the contacts?

Gear are in place, as are the head and head gasket. Still to do: Tapered clamps for flywheels Pushrod, rockerarm and exhaust cam Ignition cam Fuel tank

For my new engine, I need some very special spark plug design as it has to mimic a Diesel injector and there is only room for a 3 mm (1/8 inch) diameter. For this I bought some Macor which I found at a German supplier which also sells to privat pers o ns after payment in advance. They have...

Indeed other numbers are far more important, but here I was interested to see how much volume is displaced through these relative long and narrow tubes. Given your RPM range it does not look like the engine is struggeling to get the air in and the exhaust gasses out. Laws of physic do not...

What are the bore and stroke of this engine? I'm asking since I'm building a small database with the typical dimensionss of varois (odd) model IC engines. This to get an idea on how far one can stretch physics.

Improved version with a depth stop for pressing in the cylinder head.

Inlet valve cage assembly ready. Need to do some more deburring 😀

This exactly the type/appearance of the multi cylinder I would like to build.

First time stainless steel (AISI 303) in a precision part. The stem is diameter 3 with +0 -0.01 mm tolerance.

Drawback of not designing upfront and making drawings is that I have to cope with several non-optimal choices in the beginning that need a work around along the route. Some frame bolts were in the way and cannot be removed without compromising the squareness of the frame. Hence the cooling fins...