Anyone have a piping/porting diagram ?

[zakman]

Hi everyone, I've been building a new steam engine and its ready to be piped up. Its a double acting oscillating engine with a V twin configuration, the last one I made was the same but horizontal, and that's my problem, with the horizontal each cylinder operates opposite to the other (kind of) but with a V twin both are rotating in the same direction on the crank.

So I sat for ages drawing it out again and again but it never seems right, it always seems to be out of sync. I'm sure the 4 ports on each cylinder need to be paired sides to side, but how they connect to the other cylinder is a puzzle.

I'm hoping someone here has a drawing or can do a simple sketch of how the ports and piping go together ? or know where I can find one ?

quick edit.....I should probably say this is a steam engine

 

[zakman]

I've been sitting thinking about this, I'm pretty sure I have it now, no other combination looks like it will work, so here's what I'm going with. Unless anyone can see a problem ?

 

[vederstein]

When I do a wobbler, I make a brass scribe and insert it into the cylinder. Then I manually rotate the engine making scratches where the ports end up. This compensates for any manufacturing errors.

The following link to one of my build logs should illustrate this technique.

http://www.homemodelenginemachinist.com/showthread.php?t=25900&page=2

...Ved.

 

[zakman]

Thanks Ved, some nice work there, but what I need to know is how the ports should link to each other for a double acting twin cylinder oscillator when its a V twin. I think my diagram is right but would like some confirmation. If I get it wrong they will work against each other.

The pipes will run straight from the cylinders to a manifold, the manifold will be 2 chambers.

 

[Charles Lamont]

Your diagram is correct.

 

[zakman]

Thank you guys for the help, got round to finishing the little engine today, the frame might get painted but I sort of like the raw metal look, after all, it is a steam Harley It's 5" wide and has a 7/16 bore and it runs very nicely in both directions, also self starting. The inlet and exhaust pipes are temp to run on air, I'm going to make a reversing valve with oiler so the pipework will change slightly.