Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I need to find some pulleys so I can make it work! But under no load, it appears like its going to be a long lived runner. The rubber o-rings were hard to find but Amazon turned them up. Viton buna 70 20mm x 1mm. So far so good on the new rings although they may not be the same composition as stock. The stock rings got sticky and squeaky after a few million strokes. This caused a roaring and vibration that made the engine hit more often to overcome the stiction I believe. Heat probably added to the deterioration of the elasticity of the o-rings.

At any rate it still runs strong now on the original plug and about the fourth set of batteries.