Four Cylinder Air Engine, Experimental

An experimental four cylinder 3D printed air engine.

Toys

Creative Commons Attribution Noncommercial Share Alike

Commercial use is not allowed, you must attribute the creator, you may remix this work and the remixed work should be made available under this license.

Learn more or download attribution tags

Description


A few months ago (February, 2017) I posted a normal and slow motion video of a four cylinder air engine on my YouTube channel (https://www.youtube.com/user/popzct0214/videos). After experimenting with the design, given its weight and air flow requirements, I put in on the shelf and decided not to publish it. Since then, I've had a number of requests for the STL files, so here they are. Remember, this engine is experimental. so be prepared for precision filing and fine adjustments if you decide to print and experiment with it.

This design utilizes a spinning rotor to direct air into each of the four cylinders. The rotor contains four holes, spaced equally along the length of the rotor, and rotated 90 degrees from each other. "Gear Crankshaft.stl" and "Gear Rotor.stl" are designed to maintain synchronization between the rotor and the crankshaft to make sure air is delivered to the cylinders at the proper time. The design depends on cylinder blow by for exhaust, and as such it is not too efficient, but it does make an interesting conversation piece.

As usual, I probably forgot a file or two or who knows what else, so if you have any questions, please do not hesitate to ask as I do make mistakes in plenty.

Designed using Autodesk Fusion 360, sliced using Cura 2.7.0, and printed in PLA on an Ultimaker 2+ Extended and a dual extrusion Ultimaker 3 Extended.

Materials and methods

1) Print and Prepare the Parts.

I have attached a PDF file containing the list of printed parts which includes the part names, part counts, print settings and colors I used.

You will need to have a 1/4 thread compressor adapter and compressor to operate this model.

Prior to assembly, test fit and trim, file, sand, etc. all parts as necessary for smooth movement of moving surfaces, and tight fit for non moving surfaces. Depending on the colors you chose and your printer settings, more or less trimming, filing and/or sanding may be required. Carefully file all edges that contacted the build plate to make absolutely sure that all build plate "ooze" is removed and that all edges are smooth. I used small jewelers files and plenty of patience to perform this step.

2) Assemble the Block.

Assemble a piston by placing the smaller end of one "Connecting Rod.stl" into one "Piston.stl", and secure in place with one "Piston Pin.stl". Repeat this process for the remaining 3 pistons. Test fit the piston assemblies in "Block.stl" to make sure they slide smoothly with no binding or grabbing.

Position on "Journal Main.stl" as shown in "Block.stl". Slide one piston assembly into the cylinder from the top of the block as shown. Center the large hole in the connecting rod over the hole in the journal main, then press one "Journal Rod.stl" into the hole in journal main as shown. Test to make sure the assembly rotates with ease. Repeat this process for the remaining pistons and journals carefully noting the orientation of each journal assembly as shown.

Press "Cap Crankshaft.stl" onto the first main journal as shown.

Press "Gear Crankshaft.stl" onto the last main journal as shown.

Press "Head.stl" onto the block assembly as shown.

Slide "Rotor.stl" into the head as shown.

With the rotor aligned as shown and the first journal rotated such that the piston is at the top of its stroke, press "Gear Rotor.stl" onto the rotor as shown. The position is important for successful operation of the engine.

Thread a compressor fitting into "Adapter Compressor.stl" as shown.

Press the adapter assembly into the head as shown.

3) Test the Air Engine.

I've included a slow motion video of the engine in operation using an air compressor with about 8psi of air pressure.

That's how I made my Four Cylinder Air Engine.

Hope you like it!

Documents

Issues

Issues are used to track todos, bugs or requests. To get started, you could create an issue.

Comments

1d04affd2fadc8975327a9d220f0093d?default=blank&size=40Chris Pekar added this to the Useful Examples collection ago
75e8c2bcc8dc996ae339210da87ce8c3?default=blank&size=40Craig Hoffman added this to the Stuff to make collection ago
Mini it meBradley added this to the My Prints collection ago
3de3d3ee296517bdf5dba57577cfa997?default=blank&size=40Nick Graham added this to the Fun Things collection ago
D907865550a9add07f1814a69eeba66c?default=blank&size=40Satish Kumar added this to the working models collection ago
08db9d1502275a2a07b17a9a128f92a2?default=blank&size=40AndrΓ© Uhlmann added this to the basis-idee collection ago
15c0dbe23ff76b2ad5b85e5bc250441c?default=blank&size=40Charles Campbell added this to the Stuff collection ago
E37146c48b2ad0b5514939f0bd3c2eb2?default=blank&size=40Mathias Plankensteiner (mathiaspl20) added this to the Things to print collection ago
5cb79ce400ad54e38c4d31c9030dbbc4?default=blank&size=40Remigiusz Glaza added this to the ciekawostki collection ago
F9d70846f9719fb61452fe3de183e6d0?default=blank&size=40Khimera added this to the All collection ago
847da0171ba22ccc6de8bdd7ca2ad8a7?default=blank&size=40mauricio63 added this to the Motor de aire de cuatro cilindros collection ago
34f29e817f19fb154bf94b65296090b2?default=blank&size=40Davide Costantino added this to the Didattici collection ago
Fa5b01309262d24526a2a6fecc392c0a?default=blank&size=40nlucier added this to the Ideas for John collection ago
957ee66a7df9ed22748e32e2717b2b3d?default=blank&size=40kblman added this to the Machines collection ago
1a03f606ad0503d6e40fee1c8be66ad6?default=blank&size=40Jeff Ross added this to the Things collection ago
6ca6437ecc84a82d6ca30b9bf444054e?default=blank&size=40Damian Nowok added this to the my collection ago
28cdc85e7be01ec3dcbd1ff7fd2f7dc3?default=blank&size=40Tylera2001 added this to the make these collection ago
F05adf0345a7ab4fc4967d569baea955?default=blank&size=40Chas Wilson added this to the Pneumatic collection ago
14a5aa9f002724cfdc26d4246a356c67?default=blank&size=40Daniel Garrido added this to the Mecanica collection ago
E47ed1cad4c5c7c4be6d76ef5446f094?default=blank&size=40Mcallister_matt added this to the New collection ago
D405cff3d792c9173d8e4b9bb3327dbe?default=blank&size=40DaHc added this to the Engines collection ago
0c1f7e5134249d663e54f1434e035343?default=blank&size=40andrico21 added this to the to review collection ago
A6ad2e0dca016ce03be7daa7d0f1725a?default=blank&size=40Fatih Γ‡AĞLAR added this to the motor collection ago
930c255dcc578b011be4cd06726548ca?default=blank&size=40RoboTICs added this to the Educacion collection ago
Dfbc189802fc8ad970b7b70399707518?default=blank&size=40swdave added this to the Stuff collection ago
C6bb61fe38c9e9027d707b0d0dccae45?default=blank&size=40BGham added this to the Interesting collection ago
24064c152d65beb4fd6c38816d2e5818?default=blank&size=40max4010 added this to the lilbits collection ago
C31428441a07de30b0c9b53c316186e8?default=blank&size=40gmcrivello added this to the Things to Make collection ago
8f921f3c040c44b3226d53e1da3cf6bf?default=blank&size=40M.Schubert added this to the Tools collection ago
8c36924e614de8dcb8aceb26a69295bb?default=blank&size=40drkucic added this to the toys collection ago
Ec7690998de56619a38ae1573dee3268?default=blank&size=40John Braswell added this to the best collection ago
Mini lora and iGreg Zumwalt commented ago

@https:phillip-diehl

Thanks, I'm very happy you enjoyed it!

Please post your results, I'm always interested in seeing them.

Thanks again!

1974fc3cf142051c336ca92d482e0b61?default=blank&size=40Phillip Diehl commented ago

printing this now, love these things that are powered. neat design looking forward to watching it operate.

1974fc3cf142051c336ca92d482e0b61?default=blank&size=40Phillip Diehl added this to the engines collection ago
Mini lora and iGreg Zumwalt commented ago

danmar,

I've only run it on a compressor without a water trap and have not experienced any problems overheating. The piston to cylinder head clearance is pretty loose to allow for blow by, so the only friction points I was concerned with were the journals which I printed in nylon.

Glad you liked it!

F4b952649f8547c67b43d41985b90892?default=blank&size=40danmar commented ago

This is really neat! One question - does it get hot from friction after running it for a while?

Mini 1505222 10205579879435634 7211117197073829396 nJosΓ© Carlos Lopes added this to the Para imprimir collection ago
Mini screen shot 2013 07 15 at 6.49.36 pmErik de Bruijn added this to the Cool projects collection ago
Mini lora and iGreg Zumwalt published this design ago