Hello !
This engine runs pretty well with Steam. I would say that it runs ever better.
When the engine is hot , it can run with 3 b minimum (45 psi) but a triple needs 4 b (60 psi) to "start to breath" properly . 5 b and above being the best.
Now, to be honest, all the tests that we made shows that a triple does not have a big interest in term of power compared to others. The last cylinder having no real effect and is most probably a load for the two other ....
Above all this one which has the HP & MP on the same piston stem.
The double is definitely more efficient.
But , this one is nice, it is special & it is very rare. Due to the complexity of the drawing, I guess , we do not see many on the market. Above all with this imperial system which gages in /8th , /16th / , /32ty .... and in thousandth of an inch ! I definitely favor the metric system !
The engine has not been machined down VAP38 but by Philippe (said the lobster fisher man
)
Have a nice day !