Stirlingengineforum.com

I have seen quite a few post where people have had great success with JB Weld power pistons that were formed in the same way as described above. JB weld is hard as a rock and very high temp. Fairly easy way to make a close tolerance piston with JB Weld. Regular two part epoxy will just soften up or ...

Hi tmk,
Excellent, well written instructions!

Just asking about the expoxy.

JB weld is the only epoxy I know of that can take very high heat, and I have seen it burn at very high temps.

Most epoxies will not take any sort of heat.

What type of epoxy did you use?

As cartech said. I don't think you want the displacer airway to be constricted down to a couple port holes. I would think that the air should move freely around the entire diameter of the piston and get as even a temp distribution as is possible. You can try a spring but I think the flywheel has way...

I added a 3/4" wide brass strip inside the cylinder. That way I had something more substantial to solder the brass tubes to. The nut is just securing one end of the brass strip to the can. I used the red high temp silicon to seal the underside where the nut and tubes come through the can. Beer ...

I would say that the gap has to be within a certain range, but I don't have any exact specs cause I don't know. :smile: The reason I say this is that if the gap is too large, there would be no reason for the displacer piston to move? If the piston were 2" in diameter and the cylinder walls were...

Cool stuff.

Nice machining!

I just finished cutting a few new aluminum parts for Stirling #2 on my CNC machine I also added a coiled copper cooling system to keep the upper displacer cylinder cool. I put a very small fountain pump in a bucket of water and then send water through the coil. It runs way better than it did, it wil...

I've been busy using the CNC making a couple Stirling engines. Engine #1 is not running yet. Need to get more experience on the subject and then get back on it, it's a more complicated engine and I am just learning. Engine #2 runs on Sterno, just like a Hobo. It's a simple walking beam engine using ...

Oh man, that's a nice big clear picture of that solar-1. It makes several things very clear since I can see the detail so well. I have been running into very small images on the web. People don't take big enough pictures. :grin: Especially since I run 23" monitors here at 1680 x 1050, The pictu...

Hey Bernie. I think the brass conducts heat too quickly. The supposed cool end of the cylinder is really hot, so there would not be a temperature difference. I would like to do glass cylinders, I just used stuff that I already had on hand in my shop. I built two cnc machines from scratch. CNC'ing is...

Ahh, great, thanks. Any info at all is good info to me at this point. kinda suprised no one else here has offered any info. :sad: It's rough learing something new without some experienced help from the web community. so if I have a 10mm diameter piston, I would shoot for a 30mm llength. Based on 30m...

Ahhhh, thanks so much Bernie. That gives me a bunch of info to go on. So about 3% as opposed to what I have which is an ugly 30% :grin: Inside diameter of your displacer cylinder. Outside diameter of your piston. Which you aleady answered, about 3% Another bit of info would be helpful. inside length...

Well the new displacer cylinder does not make it run either. I have a feeling that I have too much air gap around the outside of the piston. The hot air does not push the displacer piston because it can just bypass it so easlily. My piston is about 10mm diameter and I would say that there is 3mm tot...

Hey thanks Bernie, I came to the same conclusion last night about the displacer. I am out in shop today making a new one with more air volume. We will see how this one goes and go from there. :grin: I made a new power piston yesterday and got my fit in the cylinder way better than the first one. It ...

Hi all, Just started reading about Stirlings recently and decided to build a small one on my CNC machine. I decided not to build a tin can model first, I would just dive in and do something a bit nicer. Maybe should have done the tin can first. :smile: Just last night, I had it completed enough to t...