Can-engine cap for 53.3, 58, 66 and 76.2 mm cans — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/can-engine-cap/  (CC BY 4.0)
Basis: Bore drawn at the can body OD of the can entries (Ø66 12 oz, Ø58 sleek, Ø53.3 slim, Ø76.2 steel 300); rod bore at the 2 mm rod, hose barb at the barb-4mm profile
Catalog version: 2026-10-20

Sizes: see table below
- The cap closes the open end of the can and is the cold end of the can engine's displacer cylinder. Its bore is the can body OD exactly (Ø66, Ø58, Ø53.3 or Ø76.2), 11 mm deep, under a 3 mm top wall; the outside is the can OD + 4.8 (Ø70.8 for the 66 mm can).
- On centre a Ø16 boss carries a Ø2 bore straight through for the 2 mm displacer rod (fit: run). The bore is the rod guide and the seal; nothing is pressed into it.
- The transfer port is an integral Ø4 hose barb, the same profile as barb-4mm on the silicone tube page, set 0.3 × the can diameter off centre (19.8 mm on the 66 mm cap); the 4 × 6 transfer tube goes from it to the power cylinder.
- Three Ø2.5 holes (M3 tap size) at 120°, 6 mm above the open face, take grub screws that grip the can wall. Every mating size is in the Mating features table.

file  can  bore  outside Ø  height
can-cap-66  12 oz standard  66.0  70.8  17
can-cap-58  sleek  58.0  62.8  17
can-cap-53.3  slim  53.3  58.1  17
can-cap-76.2  steel 300 food can  76.2  81.0  17

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-cap/index.json
API: https://xemstudio.com/api/geometry?object=can-engine-cap