| Hi Bruce
Just Pm'd you on the traction engine site.
The Delrin rings are fine after many hours of steaming (probably 60 hours plus) plus the bore is as it was before the ring was installed no marks no wear and it runs fine on less steam oil. One engne has a 5/8th bore the other has a 1.5 inch bore.
The angle I cut at was about 45 degrees rather than just splitting the ring across its radius. I have since made one in a coil form fora slightly larger engine.
I dont think id go back to compressed packing or cast iron rings. I will be trying an Aluminum piston with delrin rings later this year. Mostly in an attempt to reduce teh mass of the piston. I had also played with the idea of a piston with feather edge seals machined in. May still try that if time lets me.
Cheers kevin |