Small update
again.
Today I added the cylinder head and the valve lifters to the Oberursel U.III
First I have cut all the parts of their casting blocks:
So now I have 14 cylinder heads and 15 valve lifters (the last ones are on a casting block with 5 lifters)
The cylinder heads are then glued inside the cylinders with epoxy. Not with CA as it will be impossible to correct their position once inserted as it is a tight fit. In test fitting 2 cylinder head lost the fitting of the valve lifters, but I hope to be able to attach those tiny parts again. One valve lifter is eternally lost to the carpet monster and 2 others are broken. These I hope to be able to fix as well. But the other parts have been connected to the engine. While doing that don't forget to cut a tiny piece of the actual valve end which is casted in the middle of the cylinder head. Thus creating 4 open valves and 10 closed ones. While I did that I have gotten a better idea about the functioning of this engine. Because there are in the U.III 14 cylinders (2 in a circle around the crankshaft) it is now possible to make the iginition sequence in a perfect boxer mode, thus reducing the vibration of the engine. The opposing cylinders however are never in thesame circle so they are unfortunately a little bit shifted along the crankshaft. But this engine should have less vibration when compared to the U.II .
It is also nice to realise that this must have been a 14 cylinder 2 stroke rotation engine, which must have produced a huge a amount of noice and dirt, as there is no exhaust, just an opening of every cylinder with a valve. Well all is well known to most of you here I guess.
My engine is now almost ready for its first coat of paint. I just have to fix the 2 cylinder heads and valve lifters. And of course adding a spring of a piece of 0,1mm brass wire on every valve lifter. And in the meantime not destroying any already placed parts. All is extremely delicate and there is almost no safe position to store this engine apart from putting it on the Fokker itself protected by the cowling.
It's state so far:
regards,
Ivo