Displacer rods Ø2 × 60, 78, 100 and 180, Ø3 × 100, 150 and 200 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/displacer-rods/  (CC BY 4.0)
Basis: Solid rods at the bore Ø of the parts they pass through: Ø3 for the tri-clamp heads, Ø2 for the can-engine cap and LTD top plate
Catalog version: 2026-10-20

Sizes: see table below
- Solid rods with 0.3 chamfers at both ends, plain round, no flat: Ø3 × 100, 150 and 200, and Ø2 × 60, 78, 100 and 180.
- On the tri-clamp engines the rod runs from the displacer cap's socket (M3 grub) up through the head's Ø3 bore, which is its guide and seal, to the rod clevis.
- Rod length = displacer cap to clevis plus the stroke.
- On the can engine and the LTD engines the Ø2 rod runs through the Ø2 bore in the can cap or the LTD top plate, from the displacer (flush with its underside) to the rod-clevis-2mm: 180 on the can engine, 76 on the Ø100 LTD.
- On the rhombic and free-piston engines the same Ø3 rod runs up the inside of the Ø5 tube piston rod (Ø3.4 bore).

file  Ø  length
rod-2x60  2  60
rod-2x76  2  78
rod-2x100  2  100
rod-2x180  2  180
rod-3x100  3  100
rod-3x150  3  150
rod-3x200  3  200

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 7 parts): https://xemstudio.com/files/hardware/displacer-rods/index.json
API: https://xemstudio.com/api/geometry?object=displacer-rods