Opposed Piston Twin, D.Kelley

[Kim]

Really nice running engine, Achim!
Kim

[fumopuc]

Per, Simon, Dave, Art and Kim thank you very much for watching and the friendly comments.


In the meantime the exhaust pipes are silver soldered.
If interested here some pictures of the jig making.
I thought, if a CAD model is available, it make sense to use also.
 

[fumopuc]

And now the soldering job itself.
This "Wite Out" has again done a perfect job, also with the M 1,6 mm bolts here.

[fumopuc]

And finally the engine again in action with the new soldered exhaust pipe.
It is running more smooth in the meantime.


[youtube1]https://youtu.be/Oh0ppJerhnQ[/youtube1]


Next to do, a mechanical driven centrifugal water pump.

[crueby]

Beautiful!

[yogi]

Fantastic running engine Achim! Well done! 

[90LX_Notch]

It sounds really nice Achim.

-Bob

[MJM460]

A great result Achim.  Running beautifully.

I have been following nearly from the start.

Thank you for the detailed photos of the silver soldering.  That jig is the secret to the result.  What material is the block for the jig?

MJM460

[Art K]

Achim great job soldering that exhaust manifold. The opposed engine runs great. Now that you have It running just let the oil splatter and keep the rags away from the gears.
Art

[10KPete]

That's a great exhaust note!

Pete

[fumopuc]

Hi Achim

Nice idle 

Is the cooling pump running on the same power supply as the ignition ?
If so - are you sure it doesn't drop or have some really bad noise disturbing the pump (if it is a modern AC motor feed from an internal DC/AC IC) ?

Best wishes

Per

Hi Per, the ignition and pump power supply are from two different sources.
During my playing around with the engine yesterday I have had one moment with low revs were suddenly the pump was able to push the water through the circle.
So I think this little pump with its magnet driven rotor is not able to work against the  frequency of the water jacket.

[fumopuc]

A great result Achim.  Running beautifully.

I have been following nearly from the start.

Thank you for the detailed photos of the silver soldering.  That jig is the secret to the result.  What material is the block for the jig?

MJM460

MJM460, thanks for watching.
The jig was made from a piece of cold rolled steel.
It was not the best idea to go this way, because a lot heat was necessary.
Next time I would try it with a piece of square tube or angle steel.

[MJM460]

Thanks Achim,

I wondered if the heat absorption was a problem and how you tackled it.  Using a box or channel makes sense, it has to be strong enough to ensure the flanges are accurately set and your simple jig is way better than any I have tried, which is probably why I try to avoid the necessity.  I have been playing with dimensions for flanges recently, so I will try your method when I am ready to solder some. 

I think I will avoid those M1.6 bolts for the first few, though I have done some M2 so perhaps a size smaller is not too far away.

MJM460

[fumopuc]

Thanks Achim,

I wondered if the heat absorption was a problem and how you tackled it.  Using a box or channel makes sense, it has to be strong enough to ensure the flanges are accurately set and your simple jig is way better than any I have tried, which is probably why I try to avoid the necessity.  I have been playing with dimensions for flanges recently, so I will try your method when I am ready to solder some. 

I think I will avoid those M1.6 bolts for the first few, though I have done some M2 so perhaps a size smaller is not too far away.

MJM460

The source is far away from the place where you live, but may be something similar is available done under and could be very helpful for your project.
https://www.bengs-modellbau.de/en/tools/soldering-and-brazing/98/soldering-paste

[Roger B]

Excellent    Your experience in making pipework for the Snow certainly paid off    Will a centrifugal pump work well at those speeds or would a gear pump be better