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Can-engine displacer Ø54 × 25, Ø62 × 30, Ø72 × 35
What size displacer goes in a soda-can Stirling engine? · Standard part · basis: Displacer = can bore − 4 (2 mm radial gap, designed; 2.1 mm in the Ø76.2 can); Ø2 hole at the 2 mm rod
Long Earth Society build part. The printed parts for the LES can engine, sized to the cans, syringes, CDs and bearings in the library. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 3 in table
Notes
- The displacer that shuttles air between the hot and cold ends of the can. Each is a solid cylinder with a Ø2 hole on its axis for the 2 mm displacer rod.
- The 2 mm radial gap to the can wall (2.1 mm in the 76.2 can) is designed: the air flows round the displacer through it.
Sizes
| file | can | diameter | length | radial gap | rod hole |
|---|---|---|---|---|---|
| can-displacer-62x30 | Ø66 (12 oz) | 62 | 30 | 2.0 | 2 |
| can-displacer-54x25 | Ø58 (sleek) | 54 | 25 | 2.0 | 2 |
| can-displacer-72x35 | Ø76.2 (steel 300) | 72 | 35 | 2.1 | 2 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| displacer-to-can gap | 2 radial (Ø62 / 54 / 49.3 / 72 in Ø66 / 58 / 53.3 / 76.2) | can bore | designed | can-displacer-* |
| displacer rod bore | Ø2 | 2 mm wire rod | press | can-displacer-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Stirling engine | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Can engine build | video, web | LES site |
| Long Earth Society | Engine builds (videos and write-ups) | web, video | LES site |
Free files
★ Free files 4 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| can-displacer-62x30 | displacer for a Ø66 can: Ø62 × 30 (2 mm radial gap: designed), Ø2 bore for the 2 mm wire rod | STEP · STL |
| can-displacer-54x25 | displacer for a Ø58 sleek can: Ø54 × 25 (2 mm radial gap: designed), Ø2 rod bore | STEP · STL |
| can-displacer-49x25 | displacer for a Ø53.3 slim can: Ø49.3 × 25 (2 mm radial gap: designed), Ø2 rod bore | STEP · STL |
| can-displacer-72x35 | displacer for a Ø76.2 can: Ø72 × 35 (2.1 mm radial gap: designed), Ø2 rod bore | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=can-engine-displacer
How it fits
Goes in or on
Aluminium beverage cansØ62 in the Ø66 can, 2 mm radial gap
Steel food cansØ72 in the Ø76.2 canConnects to
Can-engine cap for 53.3, 58, 66 and 76.2 mm cansits 2 mm rod runs in the cap's Ø2 boreAlso needed
Craft sticks 114 × 10 × 2 mm and jumbo 150 × 18 ×…2 mm wire rod in the Ø2 holeIn these build lists
Soda-can gammaA 12 oz can as the displacer cylinder over a tea light, a 10 mL syringe barrel a…You might also need
Questions
What size displacer for a 12 oz can Stirling engine?
Ø62 × 30 with a Ø2 rod hole: 2 mm radial gap to the Ø66 can.
Why is there a gap round the displacer?
The air has to flow past it from the hot end to the cold end; the 2 mm radial gap is that passage, by design.