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

Well, Every engine in my collection that is built has been run on my new pump @ 2.32 PSI or less...Except my D3!
  I took that as a personal challenge and pulled the steam chest off and and did some light lapping of the faces that rub and also some light porting work, put back together and found it would now run on 2.32 PSI but Only with the model tipped on its side so the Cylinder is vertical. I was thinking about why this was happening and it occurred to be that the billet brass cylinder is quite heavy for its size and on such low PSI it can not even lift the weight of occillator.
  In the vertical position it does not have to lift the brass cylinder but only sway side to side so that makes all the difference! I don't really call this a "win" but I do want to fire it on live steam today to see if my light tuning job is noticeable better performance than stock.
   It IS running in this photo, if you zoom the flywheel, can see the holes machined in flywheel are a blur.

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