Well done again chuck, it is fantastic and lovely to see a replica of an actual engine. I really need to make one of these engines with your valve mechanism, it would attract so much attention at shows. What sort of pressure can they go down to and still sound more like an ic engine than a steam engine? Am thinking of the club display stand and whether it will run on there, I don't think it has great deal of pressure. Nevertheless, still fancy giving one a go either way!