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We just have one of those laser point temp guns at work. We are having off and on success with a alcohol flame. We can get it to run everytime with a mapp gas torch... Do you thing the heating section on our displacer is too short. As in the cooling fins are 2" long and the heating is only 1&qu...

here's something interesting. the engine runs better in a vertical position with the hot side of the displacer facing down. We are now getting it to run on a small alcohol flame.

Also on the clearance between the displacer piston and sleeve we seem to get two inputs. Some people say 1 mm (.040") and others are saying you want it as tight as .015". We made ours to be a .040" all around, do you think we would notice a increase with a larger diameter displacer pi...

Right now we have the stainless cap right on the alum fin radiator. We made a alcohol burner that gets the tip up to 580 degrees F but drops down to about 380-400 when the engine is cycling. With the alcohol it does not keep it running and the only success we have had was with the tip burning red un...

UPDATE!

We removed the bearing, took the plastic dust caps off and cleaned out the thick grease. We then applied a light oil... it runs. It is not fast however... We have to hit it with a lot of heat due to the paper gasket burning away and creating a leak.

http://youtu.be/qoNU2bDiOoc

Well just finished machining a stainless cap with a .015" wall thickness. The engine still does not run.... Also I cut the weight of my 3" flywheel from 500grams to 285grams by removing some of the thickness in the center. It may be in the bearing that is on the crankshaft/flywheel. Free s...

longboy I think you misunderstood me. I want to isolate the stainless heating tip from transferring heat to our aluminum sleeve with the cooling fins. We have some paper gasket material you can make engine gaskets with, that should help prevent heat transfer. We have some stainless in the shop so we...

If we made the hot side of the displacer sleeve out of stainless would we need to isolate the heat from traveling to the cooling fin alum side of the displacer sleeve?

We have a ball bearing on the crankshaft and all the connecting rods are just dowels.

Both the displacer piston and sleeve are made from aluminum. We do have a piston machined from delrin that we was going to try to prevent thermal shorts but we thought that maybe the engine would get too hot. So it looks like the hot tip on the sleeve we need to machine out of steel...

oh and i forgot the shaft on the displacer has a oil lite bronze bushing and the power piston is also in a oil lite bronze bushing. This creates a good seal with little friction

Me and my partner are building a gamma type engine for a school project. The size of the engine is .500" dia power piston, .750" dia displacer with 2.25" length. The flywheel is made of bronze in 3" diameter. The inside of the displacer sleeve is .830" leaving approximately ...