Vertical 4 cycle engine from recycled parts

[brian Rupnow]

You have probably all seen by now that I tried to build a "cross beam flame licker" engine and failed to get it running. I made two different cams for it, and took advice from several well intentioned people, but it just wasn't going to run. I have spent a happy day at my computer, designing a new four cycle gas engine which will be built using almost all of the flame-licker parts without modification. Other than the sideplates and the smokestack, all of the other parts get a second chance at life. I haven't sussed out the intake and exhaust yet, but that will come tomorrow. I love a day when I can set at my computer, uninterrupted and design a new engine based mostly on parts that I already have. Will I build this engine?--Yeah, probably. The alcohol tank will get a repositioned fuel outlet and become a gas tank.

One interesting thing about this engine is that it doesn't really have a camshaft. In order to keep everything aligned vertically and not have the con rod passing thru the camshaft, I am running a double set of gears mounted on shoulder bolts.

[aostling]

It is added to the list. I hope it will proceed, but if not I will remove the link.
'

https://bbs.homeshopmachinist.net/fo...rupnow-engines

[A.K. Boomer]

Technically it's got two camshafts, can't wait to hear those duel straight cut gears under intermittent loading should make a very unique sound...

Nice pentroof OHV design - should be good for flow... your not thinking of going racing are you Bri?

[brian Rupnow]

This morning I finished up the design, and I like it. I particularly like the new cylinder head. It is almost impossible to get a 10mm thread sparkplug and two normal sized valves into a 3/8" bore cylinder head. Having the valves at an angle lets me accomplish that. I have re-used the alcohol tank as a fuel tank, with a couple of minor changes.

[brian Rupnow]

There is a little trick in making multiple gears. If you prepare the gear blank properly, you can cut two identical gears at a time. All it means is that every time you feed the blank thru the gear cutter, you have to feed it a little farther. You end up with a gear twice as thick as one gear would be plus the thickness of your parting off tool.

[RB211]

There is a little trick in making multiple gears. If you prepare the gear blank properly, you can cut two identical gears at a time. All it means is that every time you feed the blank thru the gear cutter, you have to feed it a little farther. You end up with a gear twice as thick as one gear would be plus the thickness of your parting off tool.

Yes, I've seen sellers that have gear blanks that way, just part off what you need.

[Doozer]

Yes, I've seen sellers that have gear blanks that way, just part off what you need.

It is called "Pinion Stock".

--Doozer

[sid pileski]

Do you even need flywheels with cam gears that big?? 😅😎

[A.K. Boomer]

Do you even need flywheels with cam gears that big?? 😅😎

Yes cuz their only going half speed... but then again there's two of em

[aostling]

Technically it's got two camshafts . . .

And effectively, three flywheels.😎

[brian Rupnow]

Sid--You're right!! My trusty little drill can make those 60 tooth gears a lot lighter.

[jdunmyer]

I worked on/with a doodlebug that was built with a 1917 Dodge engine. It was a "T" head Although I didn't get inside the thing, it had to have had 2 camshafts. I did see a timing chain for that engine laying around, it was several feet long to connect the starter/generator, camshafts, crankshaft and a side shaft that had the water pump and distributor on it. Also used a vacuum fuel pump that was really neat.

For the fuel pump, see: https://youtu.be/0UpFM6oaqxU?t=8

[brian Rupnow]

I spent yesterday and today making up gear blanks for the large timing gears, the stub-shafts which bolt to the large gears, and the two top plates. The stub shafts will have a cam cut on the end which is not bolted to the gear. There is almost a whole days work in those two top plates which are right and left hand.

[brian Rupnow]

About 15 years ago I built the original "Rupnow Engine" and I used a complete CDI system from S & S Engineering for my ignition. The "Rupnow Engine" has been cannibalized over the years, giving up parts to build other engines, but I saved all (or most) of the CDI system. I hope to use this system on the new engine, but I had to send off an email to Roy Scholl this morning and ask him, "What am I lacking ". I think I only need a magnet and a sensor. I've been using old Chrysler points, coil, and condensers an all of my engines, but I think this new engine will be easier to adapt to the electronic ignition.

[sid pileski]

Better get your needs fast!
Roy has been trying to close the biz for a while now.
My buddy was somewhat interested in taking it over, but thought the better of it.
His website is still up but limited parts.
I used his ignitions. They always worked great.
Going to leave a hole in the hobby.

Sid