Stirling Engine Tolerances/Clearances

[Curtis RutterParticipant @curtisrutter61973]

in regards to the displacement cylinder and the displacer how tight a fit/or loose should it be? I've only been able to locate the relevant sizes that give me a clearance of 0.5mm between the two, is that too tight?

[Curtis RutterParticipant @curtisrutter61973]

[HopperParticipant @hopper]

0.5mm is a common figure for displacer piston to cylinder fit. Enough to let the air flow through from hot end to cool end without restricting it. But tight enough to minimise dead space.

[KettrinboyParticipant @kettrinboy]

On my engines with a displacer dia of 25 – 40 mm i make the cylinder 1.5 mm bigger than the piston and this has worked well on the 7 engines ive made so far.

regards Geoff

[Ian S CParticipant @iansc]

One of my best motors has a 2 mm gap, it has done a bit over a thousand hours of running since I built it in 1992, it's down for repairs as the displacer rod is getting worn(about .005&quot.

[Ian S CParticipant @iansc]

One of my best motors has a 2 mm gap, it has done a bit over a thousand hours of running since I built it in 1992, it's down for repairs as the displacer rod is getting worn(about .005&quot.

[Curtis RutterParticipant @curtisrutter61973]

The respective diameters are 22mm and 18mm so will try it with the 0.5mm gap and at least if it doesn't work I can enlarge the bore and get bigger displacement cylinder/displacer. Because I'm using Borisilicate glass it's giving me limited options to the sizes

Edited By Curtis Rutter on 25/05/2017 14:30:05

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