Stirling Engine Tolerances/Clearances

Stirling Engine Tolerances/Clearances

This topic has 6 replies, 4 voices, and was last updated 25 May 2017 at 14:28 by Curtis Rutter.

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25 May 2017 at 12:31 #299545
Curtis Rutter
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@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?
Advert

25 May 2017 at 12:31 #8729
Curtis Rutter
Participant
@curtisrutter61973
25 May 2017 at 12:45 #299547
Hopper
Participant
@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.
25 May 2017 at 13:55 #299551
Kettrinboy
Participant
@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
25 May 2017 at 14:17 #299556
Ian S C
Participant
@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.
25 May 2017 at 14:18 #299557
Ian S C
Participant
@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.
25 May 2017 at 14:28 #299559
Curtis Rutter
Participant
@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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