Inspiration for new air motor

[Brian Rupnow]

Well, we didn't quite get there today, but we got awfully close. I have two gaskets to make and I have to set the valve timing, but other than that I think I'm ready for a trial run.----Tomorrow
<a href="https://www.youtube.com/watch?v=58RaNBUE09I" target="_blank">http://www.youtube.com/watch?v=58RaNBUE09I</a>

[Craig DeShong]

Lots going on there Brian.  It's going to be an intresting engine to see run.  It looks,GREAT 

Good luck tomorrow, i'm pull'in for ya! 

[NickG]

Yep, looks great Brian.


Sent from my iPhone using Tapatalk

[Brian Rupnow]

Morning has come, my gaskets are made, my engine is timed, but it won't run. OH POOP!!! Howevah--if I disconnect the link which runs from the Y shaped yoke and lift/lower the actual valve "by hand" I can find one position where
 air is being passed to the cylinder (and this thing is strong considering the 7/8" bore), and one position where no air is being passed to the cylinder. This may simply be a matter of tailoring the length of the link so the two  positions I found "by hand "correspond with the max/min positions of the yoke. Maybe an adjustable length link until I find the "sweet spot".

[Craig DeShong]

          

[Brian Rupnow]

So--Here we go with the old adjustable link trick!!

[Brian Rupnow]

So--all it took was a little bit of patience and a bit of luck, and Hey Presto--We have a running engine. It's beautiful!!! I have painting and polishing yet to do, but the design is proven. I will be selling the plans to this engine for $25 Canadian funds. Thank you for all sticking with me through the build.---Brian
<a href="https://www.youtube.com/watch?v=zDU2BIC701c" target="_blank">http://www.youtube.com/watch?v=zDU2BIC701c</a>

[crueby]

Very nice runner, great sound to it too!   

[zeeprogrammer]

Congrats Brian!
Looks and sounds great.
You do sound like a happy man in the video. 

[Brian Rupnow]

Zee--I'm always glad when an engine I designed runs. On some engines I didn't get happy right away, but eventually they all ran.

[Craig DeShong]

   looks and sounds great !  We all had no doubt that it would run.  Congratulations.  Let's drink to your success 

[Larry]

Congratulations on another great design !

[b.lindsey]

Another nice one Brian. Congrats on a very interesting design.


Bill

[ShopShoe]

Congratulations Brian,

That's an interesting design and looks and sounds great running.

I'm looking forward to the paint.

ShopShoe

[Brian Rupnow]

Now here is a very interesting shot. I gathered up all the random pieces of sandpaper I could find, and mounted the flywheel on a 3/8" arbor and put the arbor in my lathe. With the lathe rotating at 250 rpm. and working on the face only, I first wrapped #180 grit paper around a flat stick and held it against the rotating face. I kept the stick and sandpaper moving a bit, for a slow count of 50. Then I repeated with 220 grit, always keeping the stick and sandpaper moving just a bit for another count of 50. Then I repeated with 400 grit, then with 1500 grit, then with a pad of "ultra-fine" Scotchbrite held in my hand--no stick. The face had by that time taken on a mirror like finish. I was so pleased with this that I then done exactly the same thing to both sides. At this stage I have not used any buffing wheels nor compound.