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New Twin Cylinder Steam Engine
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Ye-Ole Steam Dude


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PostPosted: Thu Jul 13, 2017 3:12 pm    Post subject: New Twin Cylinder Steam Engine Reply with quote

Hello to everyone,

I have started on another original design steam engine which is a twin cylinder, 1-inch bore by .875" stroke. It has a single vertical valve with dual ports for each cylinder and they ride on eccentric cams. I am attaching a few photos of some of the completed parts to date and I have uploaded several videos to my Youtube channel. So far the machining has been straight forward and the parts are fitting together as designed.






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MrMamod


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PostPosted: Thu Jul 13, 2017 4:13 pm    Post subject: Reply with quote

Nice machining love the cylinders  
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Ye-Ole Steam Dude


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PostPosted: Thu Jul 13, 2017 5:45 pm    Post subject: Reply with quote

Thank you Mr Mamod, I wanted something a little different looking, kind of "heavy duty" or "industrial" rather than just smooth sides.
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MrMamod


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PostPosted: Thu Jul 13, 2017 6:51 pm    Post subject: Reply with quote

Love it as it certainly looks heavy duty and industrial  
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Ye-Ole Steam Dude


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PostPosted: Thu Jul 13, 2017 7:47 pm    Post subject: Reply with quote

Attached is a 3-view CAD cutaway drawing showing what it is supposed to look like when completed.


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MrMamod


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PostPosted: Thu Jul 13, 2017 7:50 pm    Post subject: Reply with quote

Now that could live at my place anytime  Thumbs up!
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andycrazy


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PostPosted: Fri Jul 14, 2017 4:26 am    Post subject: Reply with quote

That is going to be a fine engine.  Its looking good!
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Ye-Ole Steam Dude


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PostPosted: Fri Jul 14, 2017 8:44 am    Post subject: Reply with quote

Hi Andy and thank you.

I sure hope it all goes together and runs real good. The valve system is based on the design on another engine that I had built and it worked real well. I increased the size (OD) of the eccentric cam but moved the crank hole closer to the center for a shorter stroke for the valves. I also have designed a "roller" wheel for the foot on the valve and it will run on the cam. I am hoping that this reduces the resistance / friction of the cam and valve action and thus make the engine run much easier.

Thanks again,
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ozsteamdemon


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PostPosted: Fri Jul 14, 2017 9:21 am    Post subject: Reply with quote

Looking good so far, so it will be a high speed engine .

Could tell from the drawing, are the valves spring return or pilot pressure return ? Wet sump ?
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Ye-Ole Steam Dude


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PostPosted: Fri Jul 14, 2017 9:47 am    Post subject: Reply with quote

ozsteamdemon wrote:
Looking good so far, so it will be a high speed engine .

Could tell from the drawing, are the valves spring return or pilot pressure return ? Wet sump ?


G' day,

Valves are compression spring loaded on the top inside the Valve Chambers. Hard to see in my drawing because the springs are omitted, but if you look closely at the Valve Chamber and the vertical hole/passage for the Valve, locate the actual Valve. The void area just above the top of the Valve is where the compression spring will be installed.

My design is two-fold as far as speed RPM is intended. I am hoping that this engine will operate as slow (very low RPM's) as my engine No.1 and on very low pressure. But with the shorter stroke on the connecting rod and the valves I am also hoping that it will operate at a higher RPM and on lower than "normal" pressure.

The "roller" valves along with aluminum pistons, aluminum rods, a bit lighter crankshaft and brass liners in the cylinders is an effort to eliminate as much friction/resistance as possible.

This is a dry sump design.

I am attaching a short video of the assembled parts to date. I appreciate your interest and good questions.

https://youtu.be/VRNte5Jr6pA
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ozsteamdemon


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PostPosted: Sat Jul 15, 2017 12:22 am    Post subject: Reply with quote

Good to see the video Travis, very nice work.
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Ye-Ole Steam Dude


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PostPosted: Sat Jul 15, 2017 1:19 am    Post subject: Reply with quote

ozsteamdemon wrote:
Good to see the video Travis, very nice work.


Thank you ozsteamdemon,

I have so many friends that ask to be kept up to date on my projects and I find it so much easier making the videos.

Have a great weekend,
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Ye-Ole Steam Dude


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PostPosted: Mon Jul 17, 2017 7:30 pm    Post subject: Reply with quote

I am seeking some help about whether or not to paint everything on the engine except the brass pieces. I think it just does not look like an old steam engine in the shiny aluminum. I have looked at a lot of photos period correct and most steam engines are painted except for the brass, some stainless and the moving parts like the crankshaft. My long range plan for this engine is to install it into an ole river boat design and the engine must match that era. Any helpful suggestions will be appreciated.
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MrMamod


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PostPosted: Mon Jul 17, 2017 7:55 pm    Post subject: Reply with quote

My TWO choices    Painted black with brass bits OR leave as is with brass bits I just can't decide  
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Ye-Ole Steam Dude


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PostPosted: Mon Jul 17, 2017 9:20 pm    Post subject: Reply with quote

MrMamod wrote:
My TWO choices    Painted black with brass bits OR leave as is with brass bits I just can't decide  


Nice to get a very firm and deceives answer....he he. Hey that is where I am stuck now.

I did see earlier today a photo of a marine engine painted black on the lower half and (maybe) a marine gray on the upper half and it really looked good. It did have a bit of a cream color trim added.

I still need help to decide....

Thanks,
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