For some reason, when I got the PMR boiler kit, I also ordered unions, els, t's, etc in 3/16"
Last evening I was reading, in Harris' boiler book, that the piping should have an i.d. of cylinder bore X 0.3 for a 2 cylinder engine. The Pumping Engine has a bore of .625. So .625 x .3 = .1875. This is the i.d. of 1/4" piping.
Will piping in 3/16" restrict something that shouldn't be restricted or reduce the efficiency of the engine?
Best
Stan