Can-engine displacer Ø54 × 25, Ø62 × 30, Ø72 × 35 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/can-engine-displacer/  (CC BY 4.0)
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
Catalog version: 2026-10-20

Sizes: see table below
- 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.

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

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Stirling engine — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Stirling_engine
- Long Earth Society: Can engine build — video, web — LES site — https://longearthsociety.com/engineering/
- Long Earth Society: Engine builds (videos and write-ups) — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 4 parts): https://xemstudio.com/files/hardware/can-engine-displacer/index.json
API: https://xemstudio.com/api/geometry?object=can-engine-displacer