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xander janssen

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Made a medal for the skipper of the tug boat "Odilo" to thank him for supporting me in building this engine.

20230220_152946.jpg
 

xander janssen

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A friend 3D-printed me a template for the crank case covers. Next is to deburr it, cast it in heat resistant silicone and replicate it in pewter.

Size is 37x37x2 mm (1.5 x 1.5 x 0.08 inch) with 4 mm (0.16 inch) font.

IMG-20230225-WA0002.jpg
 

xander janssen

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Last week CNC milled some flanges, soft soldered the cooling jackets. Next is to pressure proof them with air while holding them submerged under water. No bubbles = succes.

Internally, there is a nice filled of solder. The gap visible on the outside is due to a too large chamfer/debur on the edge of the tube.

3d design of the head is also finished. First will make one prototype from aluminium before machining two from solid brass.

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minh-thanh

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Looks great !
Do you intend to start the engine with compressed air ?
That is very interesting and different
And, because.... I'm very interested in ..;)
 

xander janssen

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Looks great !
Do you intend to start the engine with compressed air ?
That is very interesting and different
And, because.... I'm very interested in ..;)
Hi,

I'm not building the air start. The head design is already rather complicated as it is going to be a machined part from bar stock. A casted head would leave more options, but still, adding another functional valve in the already tiny head would give me headaches
 

xander janssen

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Slow but steady. Finished the pre-machining of the dummy cilinder head. Before I go to the expensive 60mm (2.5") diameter brass, I test all machining steps on a piece of aluminium.

After turning and saw-cutting away the bulk material, the 0,0-ref point is reamed and a reference plane is milled. A sanity check with a 1:1 scale drawing to see if there is enough material for cnc milling the outside profile, hole patterns and recesses.

Once all processes are checked, the two final heads will be a matter of a few hours.
 

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