Hi, Whilst on the subject of injectors, some of you will know that I am trying to finish off an Allchin traction engine in 1-1/2" to the foot scale. I have got round to piping the various steam valves to their appropriate destinations. One of them goes to the injector. To my surprise the original articles (I have them all bound together as a builder's manual) has no mention of the injector, other than to show you where it is located. Anyone know what sort of size injector is used on this model engine. Anyone have references to a design of a suitable size that works with steam pressure up to about 80 psi? Thanks in advance. Cheers, Roger Mason, in St. Agnes. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.