A new engine for fall---

[Brian Rupnow]

No, you don't have to sign up to get the download. Select the "slow download" option---it isn't slow.---Brian

 

[Brian Rupnow]

The engine runs well, but the gears are---ahh----noisy. I knew that they would be. They mesh well, and operate very smoothly now that I have an hours running on the engine. However, experience with other engines I have built sort of forewarned me that the open gearing would make a fairly noticeable "whirring" noise as the machine ran. That is why I made provision for an enclosure to go around the gears. An enclosure will cut down the noise quite a bit, will act as a containment for grease around the gears, and will provide some measure of safety (although I doubt I would have stuck my fingers in there anyways.)

 

[werowance]

Congratulations, its a beauty. nice sound and nice to watch.

Great Job / Work.


Bryan

 

[Brian Rupnow]

Thanks Bryan--Fabrication of the timing gear enclosure went very quickly with no problems. i did have to split it to get it on, as I had indicated on the drawing. The only problem I ran into is that I don't have any bolts long enough to bolt things together. I had to order a minimum quantity of one hundred #5-40 socket head cap screws x 1 1/4" long to get the 6 I need. That will probably last me for the rest of my natural life!!!

 

[Brian Rupnow]

When Ringo sang the song "It don't come easy" I'm sure he must have been thinking about something like this fan shroud!!! The only tube/pipe I could find slightly larger than my 3" diameter fan was a piece of schedule #40 3" nominal diameter steel pipe. It has a 3 1/16" inside diameter. I don't like working with pipe in the lathe.--It's nasty stuff to hold if you don't have a bull nose live center for the tailstock (I don't) and it has a propensity for jumping out of a 3 jaw chuck and rocketing around the room. This forced me to take .002" deep very light cuts until I had things close to the outside diameter that I wanted to end up with. The wall is still a little thicker than I would have liked, but it was just getting too scary. I have had a slight change of plan----I was going to silver solder it to the fan support bracket but that would have given me no adjustability at all. I have come up with a rather novel solution for bolting it to the fan bracket instead, giving me a bit of wiggle room if it ends up interfering with the tips of the fan blade anywhere.

 

[ShopShoe]

Brian,

I know, it's done. What is the O.D. of your fan? Could you use a piece of propane cylinder? (As in hand-held torch.)

--ShopShoe

 

[Brian Rupnow]

Going boldly where no man has gone be----Well, you get the idea.--Fan shroud is coming together nicely. At the last minute I decided to make the small pieces silver soldered to the steel hoop from brass. My reasoning--If I have to slot the holes with an end mill to move things around for fan clearance, the brass cuts easier. As you can see in the picture, the soldering job called for a couple of strange little "fixtures" to ensure that everything ended up where I wanted it to be. Now to ensure that the steel hoop will be concentric and clear the tips of the fan blades, I wrapped the fan with masking tape until I had .030" thickness of masking tape. Slid the hoop over that (snug fit) and will mark thru the brass ferrules welded to the hoop with a transfer punch to locate the holes I will tap in the fan stand.

 

[Brian Rupnow]

Shopshoe--there are probably about a hundred different things that I COULD have done. The pipe solution came to mind because I knew that the i.d. of that size of pipe was 3 1/16" and wouldn't need any machining inside.

 

[Brian Rupnow]

So, there we are!! Painted up pretty and done like dinner!! Nothing rubs nor scrubs, nor interferes, but a business card won't fit into the gap between the flywheel and the bottom of the fan shroud.--But it does clear. And that, my friends, was the very last part I had to build for this engine. I have to wait a couple of days for my long bolts to come in that hold the timing gear covers in place, but that's it. I will post one more video before I'm done, showing the engine running at its slowest and fastest speeds because someone has requested it, but other than that, I'm finished. This has been a long thread, as I knew it would become when I started it in July, but it's been fun and interesting. I encourage anyone out there who has at least a couple of i.c. engines "under their belt" to build this engine. ---Brian

 

[Swifty]

Thanks very much for all the posts Brian, it's a great looking engine.

Paul.

 

[toolznthings]

Thanks so much for your hard work and the drawings for your latest engine !

Brian

 

[dsage]

A wonderful looking and running engine. I like the looks better when the gears are enclosed even though it hides the interesting bits. Makes the engine look like it's ready to install in something.
Fantastic work.

Thanks Brian
Sage

 

[Brian Rupnow]

Liar Liar--Pants on fire---I said I wasn't going to post anymore but---I have never really liked the base I made for this engine. Oh, it was a lot better than the long angles that I had first proposed, but somehow it never looked--uhh---industrial enough for me. so--Today being free time, and having a bit of 3/4" aluminum left over, I made a new base. I like it much better.

 

[Brian Rupnow]

As Bugs Bunny would have said----That's all folks. Thanks for following.---Brian
[ame]https://www.youtube.com/watch?v=6mQeqhapvJo&feature=youtu.be[/ame]

 

[ShopShoe]

Brian,

That's great and sounds great. It looks like the Chuck Fellows Carb. is working very well with excellent control. I like steady running at about the speed you're running: Don't like high-revvers so much.

Thanks for sharing your work all the way through. I have followed it every day.

--ShopShoe

 

[Path]

Brian ...

Thanks for another great engine .

Pat H

 

[Brian Rupnow]

Shopshoe--Thank you for being a loyal follower. Pat--I haven't heard from you in ages. Did you ever finish your build of the original Rupnow engine?---Brian

 

[Path]

Brian ...

Unfortunately, I'm stalled and haven't done anything on it since my last update.

It's just that I'm so busy with customers that by the time I get a break I'm beat and or have family obligations. I even hired a part time helper to do some of the work. Every time I think I going to be able to slow down someone needs something yesterday.
Although this is a good thing it is taking a toll on this old body.

But the Rupnow engine is on the shelf in sight as a reminder that as soon as I can I will get back to it and get her done.

Later,

Pat H

 

[Brian Rupnow]

Judging by the number of downloads I have had for the plans of this engine, someone, somewhere , is going to build it. I am going ahead with a gas tank bracket and gas tank for it, so will post them as "supplementary drawings" to the main download package. The bracket is located right in the center of the engine block, and the underside of the bracket is 1" below the top of the block. This will place the top of the tank about 1/8" below the center of the carburetor.

 

[Brian Rupnow]

I spent all of yesterday fighting "gas tank wars". What should have been a very simple and straightforeward silver soldering job left me frustrated. All of the joints looked good, but when I put a rubber tube on the outlet spigot, then put the tank underwater and blew into the tube, I got a stream of bubbles coming out of the one end. I resoldered it twice, with the same result each time. Finally I set the whole tank up in the lathe and drilled/bored the leaking end completely away, made a new brass end insert and silver soldered it again before I went to bed. As of right now it doesn't leak, as per the "blow test" but I haven't filed away the excess silver solder either. I am waiting for my wife to get up before I start any power equipment in my shop, but I sincerely hope that when I get my last solder joint "cosmeticized" that I don't see any more bubbles!!