Engine Troubleshooting

Discussion on Stirling or "hot air" engines (all types)
saints9626
Posts: 2
Joined: Sun May 21, 2017 10:50 am

Engine Troubleshooting

Postby saints9626 » Sun May 21, 2017 11:15 am

Hello,

As a second year uni project (2 years ago now) I made a stirling engine. I could however never get it to run. I didn't have the time to troubleshoot or refine the engine as I had plenty of other stuff to do. Now I've finished uni, I want to 'complete' the project, and get it working!

The engine is made entirely from metal, the base plate is Mild 10mm thick, a stainless tube for the displacement cylinder, a tin displacer, mild steel top plate and various ali/stainless/mild parts for the crank and piston arrangements. The power piston is a piece of graphite in a mild steel cylinder (machining finish is not excellent) I have attached a few photos of the engine.

My query is, what is the first thing to improve in order to get it running. When I try it, it offers no indication of even wanting to power itself in either direction.

Here are a few of the things I suspect are wrong:
-Power piston not airtight seal to cylinder
-Displacement cylinder not airtight to top or bottom plate
-Displacement cylinder shaft hole too big
-Passageway from cylinders not large enough/acting as a heatsink

If i have missed anything or referred to anything incorrectly please excuse this, its been a while since I researched them. Any help or input welcome, thank-you!
Attachments
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passage-way between displacement and power cylinders
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18678918_10213176315750503_1578943520_n.jpg (80.43 KiB) Viewed 451 times
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18674923_10213176317750553_1085057095_o.jpg (175.15 KiB) Viewed 451 times
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18618778_10213176318390569_1970479969_o.jpg (143.85 KiB) Viewed 451 times

thanh-cuibap
Posts: 139
Joined: Tue Sep 06, 2016 8:09 am
Location: Việt Nam

Re: Engine Troubleshooting

Postby thanh-cuibap » Sun May 21, 2017 8:14 pm

You can check this :
18678918_10213176315750503_1578943520_n.jpg
18678918_10213176315750503_1578943520_n.jpg (302.28 KiB) Viewed 441 times

Ian S C
Posts: 1941
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: Engine Troubleshooting

Postby Ian S C » Sun May 21, 2017 11:40 pm

The first thing is that the power cylinder with a graphite piston has to be better than excellent, that is why they are used in glass cylinders. A good steel cylinder with a polished bore is essential. Got to go out to night so I'll look in again.
Ian S C

saints9626
Posts: 2
Joined: Sun May 21, 2017 10:50 am

Re: Engine Troubleshooting

Postby saints9626 » Tue May 23, 2017 1:02 am

Thank you for the responses, what would you recommend for gasket material? I have some thin neoprene i could cut up. You have illustrated a heatsink, what is the purpose of this?

Thankyou!

thanh-cuibap
Posts: 139
Joined: Tue Sep 06, 2016 8:09 am
Location: Việt Nam

Re: Engine Troubleshooting

Postby thanh-cuibap » Tue May 23, 2017 6:11 am

Hi Saints9626 ..may be help you !!
1.jpg
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18676642_10213176315310492_1974154933_o.jpg
18676642_10213176315310492_1974154933_o.jpg (334.01 KiB) Viewed 407 times

snevircvirc
Posts: 5
Joined: Thu Aug 03, 2017 6:49 am

Re: Engine Troubleshooting

Postby snevircvirc » Thu Aug 03, 2017 7:03 am

Thanks for the article
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