A little Sleeve Valve Engine

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NickG:
Wow, this really is a work of art and beginning to take shape nicely! A homemade tap too - something I've not seen before.

Nick :bow:

Joachim Steinke:
Hi,

in the mean time I got through with the piston rings.

As you might remember I had turned and parted them already, now they must be divided, widened and tempered to get the right working tension.

As the grooves in piston and head are 1.05mm wide and the parted rings are exactly 1.00mm thick, I don’t have to grind there flat face for a final fitting, 0.05mm clearance will be just right for this dimension. So I just removed the tiny burrs left from the parting operation on a very fine grinding stone. With a round 1mm needle file I cut the slot for the fixing pins and then the rings where divided with a small and sharp chisel on a flat steel plate.

Being too lazy to make a special fixture for the widening operation I put the rings (I finish only 2 of the 8 prefabricated in the moment) on a little steel plate, brought the 3mm distance pieces in the gap and set a little clamp on the whole assembly. For the heating I like to take my small muffle furnace, unfortunately it has no temperature control and for stress relieve the temperature should better not go further than 600, max. 650deg Celsius.

For that reason I put the whole fixture in a small steel ash tray and filled it with dry sand.

The sand allows me to control the temperature quite easy. After the first heating up time I took the tray out about every 5 minutes and measured the temperature inside the sand, reaching approximately 600deg Celsius the whole thing was done and I let cool it down slowly. As the sand buffers the heat very well the rings get the additional needed stress relieve time outside the furnace, but without the possibility of overheating.

This are the two now finished rings, the rest will be kept for “any case of emergency” to come….ha ha ha….

The engine is running fine with both rings assembled and the compression is real strong now.

I have made two videos of the semi open engine so you can have a look at the moving parts and the rotating ports. But the quality is not that good, I don’t have a high resolution video camera at the moment and had to take them with my Canon IXUS instead.

http://pl-hi.de/JST/SLVE/JST_SLVE_RT_01.mpg

http://pl-hi.de/JST/SLVE/JST_SLVE_RT_02.mpg

Good night from Achim

sbwhart:
Great piston valve action Achim
:headbang: :headbang: :headbang: :headbang:

Thanks for showing

Stew

Stilldrillin:
Now..... That`s mesmerising! :clap:

David D

NickG:
Wow, never seen anything like it! This is like model engine pornography :lol:

Shame you won't see all that motion when it's built together!

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