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Another piston with V-milling, easier to make. I will do a test on a single cylinder with at least 2 types of pistons to see if there are any appreciable differences. Another solution could be to place the spark plug on the head with a recess similar to Holt 75 but it would be different from the...

Hallo Leerkracht Beautiful engine, is the glow plug on the head or in the cylinder?

to facilitate the ignition of petrol, through the spark plug, in addition to the first version, I designed 2 other versions, similar to each other, the last one has an inclined plane. What could be the best solution? I remind everyone that the spark plug is located on the cylinder, next to the...

sorry for my mistake 18 pistons + 2 extras = 20 not 26

I really appreciated your suggestion, even a friend of mine who builds engine models suggested a similar thing to me. “The flame triggered by the spark plug must reach the center of the piston.“ In the next few days I will draw the piston by copying your drawing. It will be a bit complicated to...

It would be a great success if all 18 cylinders worked, no performance is required, I don't have to fly, I just want to hear 18 pop in succession :rolleyes:

Cylinder and piston: in the original engine the spark plug is directly on the cylinder, the piston is concave and the petrol is ignited correctly. In my engine ,to have a correct compression ratio , I had to make a dome on the piston to leave the spark plug uncovered. i think it is not a good...

so far I have 149 drawings and I have not finished..... many are duplicated with minor modifications to optimize the design

Fusion, but I think all 3D programs can do these simple designs..

The project is taking shape, the main components are designed

The crankshaft is identical to the crankshaft of a straight 6-cylinder

Very ingenious your solution, I had tried a similar thing, I should have used a 4 mm ball endmill and then an flat endmill to remove the edges, with poor quality of the lateral conrod housings, I preferred an easier solution. Even the second solution with T slot endmill you see below, doesn't...

For now I am not planning to fly, but in the near future ....:p

I am working on the project, after having done some calculations on the stroke of the pistons to size the length of the connecting rods, the cylinders and the crankshaft, I have produced some drawings: The original connecting rods are built with steel, with very thin thicknesses, my connecting...

I plan to make the most important parts by casting aluminum with the casting mold made by 3D printer, some parts lost PLA

Hi G54AUST It is a very demanding projectI but I will try to simplify this engine, I don't need as many HP as the original Isotta engine ;) This old engine is also used for tractor pulling......

yes the 3 cylinders are aligned, the firing order is also interesting, the number that appears in the diagram is not the cylinder number, but the ignition order, see for example the position 1-2-3 , 4-5-6 etc.

I found an old maintenance manual for this interesting engine built in Italy in 1930. 2 versions were made, one aeronautical, aluminum casing, one for naval use, all cast iron. It's a very challenging project but I decided to build the airplane version, 1: 5 scaled engine model, I think it is...

Ferrari F1, first and second place in the Bahrain race, finally a good engine from Motor valley