Thermoacoustic hot-cavity liners: Ø47.5 / Ø44 tubes that set a 40 mm hot exchanger flush with a closed hot end's face — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/thermoacoustic-hot-cavity-liner/  (CC BY 4.0)
Basis: Design values: lengths = the hot section's inside depth (length − 3 mm closed end) − four 10 mm hot exchanger discs
Catalog version: 2026-10-20

Sizes: see table below
- A plain tube that stands on the inside of a closed 2 in hot end and holds the hot heat exchanger at its top, so the exchanger's top face is flush with the hot end's clamp face. The stack in the next section then stands on the exchanger, across the hot joint.
- Bore Ø44: the gas inside the liner is the engine's hot cavity, the gas spring at the hot end that sets how much the gas moves through the stack. Outside Ø47.5: the spool bore, a slide fit.
- It runs at the hot end's temperature: it has to take that temperature. The file is the geometry; what it is made of is the builder's choice.

part  hot section  section length_mm  inside depth_mm  liner_mm  hot exchanger above_mm
ta-hot-liner-2in-17  cup-2in-60  60.0  57.0  17.0  40.0
ta-hot-liner-2in-47  cup-2in-90  90.0  87.0  47.0  40.0
ta-hot-liner-2in-77  cup-2in-120  120.0  117.0  77.0  40.0
ta-hot-liner-2in-109.4  closed-spool-2in-152.4  152.4  149.4  109.4  40.0

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Xem Studio: tools/gen_ta_modular.py: the section geometry, the network model and every number on these pages — code — CC BY 4.0 — https://xemstudio.com/
- Long Earth Society: Engine builds — 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/thermoacoustic-hot-cavity-liner/index.json
API: https://xemstudio.com/api/geometry?object=thermoacoustic-hot-cavity-liner