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This was my build might give you some ideas

It is the relationship between the journal and their respective eccentrics, because the eccentrics are made together and the engine is reversible the eccentrics need to be set equal to the respective journal. I have found that as long as you have machined to the drawings and any irregularities...

I am going to run these on steam, they run fine on air but I need to sort the pipe work out.

The crank throw is 1/2” at 120 Deg and the IP cams are 5/32” throw at +- 105 Deg from the IP crank, it will certainly complicate the manufacture of the crank shaft good luck with that not for the faint hearted.

I first got the engine building enthusiasm at school with a Stirling hot air engine even casting the base in aluminium, nothing special back then. Then after spending my working life in engineering and only managing to build a Stuart D10 but assembling all the machinery I...

This is the method I used on the three I have done and they all ran first time, hopefully it makes sense. Assumptions: The cams are machined to the correct throw and angles, check HP 30deg IP, LP 15deg and the cylinder ports are machined to the drawing and if not possible compensated in the...

It’s certainly running great,well done bet you can’t wait to get it finished now.

Making them that way certainly produces a nice looking rod

Emers The base was cast by a gentleman in the states who is interested in creating a Stuart triple in bronze (no worries about water left after running on steam), I have made some parts for him in exchange.

A little more progress on the handed Stuart triple, the first machining of a newly cast bronze base, it will certainly stand out from the standard engines, the pictures show the process steps.

I have never seen a solution for supplying oil to the big ends, so I decided to try this a 1.6mm hole through the rod with a countersunk hole at the top under the cross head, it will either work or fling oil over the cross head, we will see.

Just remembered don’t throw the end pice of material it’s perfect for machining the outside of the big ends

Emers forget to add I did the taper @ 1deg it comes out about right

And the rest

Process I use for manufacture of the connecting rods hopefully the pictures tell the story

Slightly different Stuart Triple this time, it’s will have a bronze base cast from a 3D print (not by me) the rest of the castings are an eBay set of that has had the cylinder block started, but I will need to rework it to change the inlet/outlets over. The crankshaft is one I made earlier from...

Worth drilling the cladding holes in the cylinder block (easy to mount) before you get to much sticking out of it

One other thing the shaft holding the expansion link arms, drawing says 6 15/16“, make 7 1/4” and trim down when you have the expansion links connected to the valves. Had to be longer on all the ones I have done.

Maybe a bit late, but when I made mine I found it needed more than the 1” of thread shown on the drawing I needed 1 1/8” minimum to achieve full movement of the expansion links.

The two I have built will run without but they definitely run better with the springs If it was running on steam there would not be any benefits