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Rocking Engines

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NickG:
John,

I made an oscillator with 1/4" bore and about 3/4" stroke with a slight design floor, at 90 degrees before TDC when exhausting the with of the cylinder wasn't big enough to cover the inlet port so there is momentarily an air leak and you can actually hear it, even when running at speed! It uses a lot more air than an engine of that size should too!

Nick

sbwhart:
Hi Chaps

Well I made a new piston and fitted it all together


AND



ITS A RUNNER
But


It'll only run upside down

 :lol: :lol: :lol:

What I've found that it ony needs a whisper of air any more and it just locks up in the forward position.

To get it running correct way up I think I need a better fit in the bearing, also the contact area on the bearing is only small so I'm thinking I may change the design to increase the contact area so you get a better fit without slop.

Also took a video but I can't get it to play my machine use to open the up as microsoft media player but for some reason its taken it in its head to open them a nero don't know why  :scratch: but it wont run now.

What with upside down running engines and computers with an invisable hand lifes getting spooky.


Fealing strange

Stew

Stilldrillin:
Stew,

Well done (so far) with the Aussie engine!  :thumbup:

"Fealing strange"  ??  :scratch: 
You wait a while into retirement, then the whole world will feel strange. BUT you`ll be used to it by then......  :lol: :lol:

David D

raynerd:
Get the camera back out Stew when you get a chance - would like to see it running upside down or not! Keep us informed.

Chris

rleete:

--- Quote from: sbwhart on July 15, 2009, 02:11:03 PM ---also the contact area on the bearing is only small so I'm thinking I may change the design to increase the contact area so you get a better fit without slop.
--- End quote ---

Did you press fit the sleeve (the .188 diameter tube) into the cylinder/frame part?  I think that's how it's supposed to work (and how I am making mine) so that you get the full length of that sleeve as a bearing surface.  No instructions along with the plans, and not even any tolerances specified, so it's not completely clear how it is supposed to go together.  I'll have to have another look at the plans.

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