A little Sleeve Valve Engine

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NickG:
Incredible work Achim. As I was reading through I thought I was going to have a lot of questions but you answered them all and the video answered the rest! It looks very complicated and I have never seen valving like that before. It's even got an oil pump which I recognised before I got down to that bit.

This is going to be some project.

Thanks for showing it,

Nick

Joachim Steinke:
Hello to all you out there in this Christmas Night.

Monday I started with the real work on the crankcase and want to show you some pictures.

After milling the blocks to size from 7057 alloy stock I bored and reamed the pilot holes for the cam- and crankshaft bearings on the mill and taped the threads for jointing the two halves. Two of the threads contain a little aligning bush which will fix the parts precise for all further operations and naturally for the final assembly.

The concept is going from the inner parts to the outside geometry of the case, so I let an allowance of 0.25mm on each face of the blocks. The parts will not milled to final size before I have finished all the boring and facing jobs on the lathe, so the gripping marks of the lathe chuck don’t bother me.

After some hours of centering, boring and milling I got an acceptable, intermediate result, all parts are fitting very well.

So I continued with things like boring the oil system, taping a lot of left over M2 and M2.5 threads and all the rest of detailing the case.

Finally, after removing all allowance of the case sides and finishing the hole parts with water-resistant abrasive paper, steel wool and fine grinding pads the crank case is already completed.

Now I can continue with the crank- and camshaft, followed by the cylinder garniture and the oil pump. But things can go a lot more relaxed now, for the engine case is the most time consuming single component, one mistake here and the need of machining a complete new case would be the bitter consequence.

Good night from Achim

Darren:
Good grief, that's some very nice work you're doing there :bow:

John Hill:
Thank you Achim for showing us your beautiful work and beautiful pictures too! :thumbup:

sbwhart:
Great Build Achim. :clap: :clap: :clap: :clap: :clap: :clap:

Enjoying your posts very much

Cheers
:beer:
Stew

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