Single Cylinder Opposed

[rdean]

I was surfing the internet and this drawing showed up and cough my eye.



It is a 1900 Gobron-Brillié opposed-piston engine.
It is a 2 cycle 2 cylinder 4 piston opposed engine.


I have only been able to find 4 drawings of the engine and almost no technical data so a picture is worth...
I will try to build a single cylinder 2 piston 4 cycle opposed piston engine of similar design.
I have already built a 2 crankshaft 2 piston opposed single cylinder chain drive engine that runs just fine. So I have high confidence.


I usually start by building the crankshaft of the model first and then make the engine block fit the crank. I had to order the ball bearings for the crankshaft and I wanted to get started so I drew this up for reference.


I marked out the lines on a previously sized block of aluminum.


Milling out the parts that don't look like an engine.


Milling the connecting rod relief sections.


And the results so far.


Thanks for looking
Ray

 

[Boswell]

That sounds very ambitious. I'm looking forward to this build.

 

[Eddyde]

Looks like an awesome project! I'm looking forward to seeing the progress. Thanks for sharing.

 

[rdean]

Thanks to both of you and welcome aboard.

Ray

 

[Tom1948]

Looks challenging Ray.

 

[rwm]

Now this looks really interesting!

 

[rdean]

Tom and Robert thanks for the reply I'm ready for another challenge.

I milled the center hole and the side slots for the upper connecting rods.


This is where I usually paint the engine block some color but it looked so nice that I decided to just give it a good buffing.


Thanks for looking
Ray

 

[Chris Hamel]

You have me really intrigued. Looking at the drawing, I really can't get a handle on how this thing functions. Guess I need to stare at the drawing for a while.

 

[tq60]

Some diesel engines have this design.

Has 2 crankshafts connected with a chain, the pistons form top and bottom of cylinder and have a very high compression ratio.

2 stroke without normal valves.

Sent from my SM-G781V using Tapatalk

 

[extropic]

Watching.

I don't understand (from the graphic) how exhaust is handled by the Gobron-Brillié engine. The "A" ports are named "valve pocket" on Wikipedia.
Like you said, not a lot of information out front.