What is the purpose of using two cylinders in a Moriya Stirling engine fan?

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Discussion Overview

The discussion centers around the design of the Moriya Stirling engine fan, specifically the purpose of using two separate cylinders for the power piston and the displacer piston. Participants explore the principles behind this design choice compared to other Stirling engine configurations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the rationale for using two cylinders in the Moriya design, seeking clarification on its principles compared to other designs.
  • Another participant points out that the design linked in the original post does indeed have two cylinders, but they are connected, unlike the Moriya design where the cylinders are separate.
  • A participant elaborates on the Moriya design, noting that there is a drilled passage in the base connecting the two cylinders, which is not visible externally and is closed off with a threaded plug.
  • A participant shares their personal experience of building a Moriya Stirling engine as a school project, indicating that it still operates well after many years.

Areas of Agreement / Disagreement

Participants express differing views on the connection between the cylinders in the Moriya design versus the linked design referenced. There is no consensus on the advantages or implications of using separate cylinders.

Contextual Notes

Some assumptions about the visibility and functionality of the drilled passage in the Moriya design remain unexamined. The discussion does not resolve the technical implications of using separate versus connected cylinders.

hihiip201
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The design in that link *does* have two cylinders -- one for the power piston and one for the displacer piston.
 
But in the moriya design, there are two different cylinders that are not connected. (power and displacer are separated.

Here the two "cylinders" are connected in the link.
 
hihiip201 said:
But in the moriya design, there are two different cylinders that are not connected. (power and displacer are separated...

In the Moriya design there is a drilled passage in the base, that connects the two cylinders. You can't see this from the outside. The outer end of the passage (where the drill went in) is closed off with a threaded plug. Depending on how the engine is mounted, the legs may cover up this plug so you would not see it.

I built one of these as a school project (35 years ago!) following the plans in Live Steam magazine (December 1974 thru February 1975). The engine still runs fine.

Good luck, it is a fun project.
 
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gmax137 said:
In the Moriya design there is a drilled passage in the base, that connects the two cylinders. You can't see this from the outside. The outer end of the passage (where the drill went in) is closed off with a threaded plug. Depending on how the engine is mounted, the legs may cover up this plug so you would not see it.

I built one of these as a school project (35 years ago!) following the plans in Live Steam magazine (December 1974 thru February 1975). The engine still runs fine.

Good luck, it is a fun project.



I see! thanks!
 

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