Bruce Macbeth Engine, European Version

[gbritnell]

I like the dents in the barrels. It gives it a more realistic appearance.
gbritnell

[Admiral_dk]

Great to see you back Achim and con gratulations on retirement - I still have some six and a half years left ....

Nice update and like George I really like the "beulen" (dents) in the barrels 

[fumopuc]

Hi George, Per thanks for watching.


The cylinder heads are started in the meantime.
The challenge is shown by the CAD section view below, a hard soldered assembly by the main body and a plug to get the necessary water jacket.
I have purchased a piece of brass with the hope, that 5 pieces of the cylinder heads are already hidden in it.
Some facing has be done as the first step for all.
Followed by machining the round water jacket into the blocks  and the holes with overstock for the valve seats.
A nice job, manged perfectly by the computer for all 4 pieces and the usual set up part.


Yes, the CAD model is not complete, the assy machining of the exhaust outlet still has to be done, red circle.

[Roger B]

Congratulation on your retirement    You won't have time to do anything any more 

I guess the models of those barrels were too realistic    Lots of brass swarf and some interesting fabrication to come     

[fumopuc]

  Lots of brass swarf and some interesting fabrication to come 

Indeed, that is the keyword for the next action.
Again my 3D finder has done the job to catch the center of the pre machined block.
Next pictures showing the final set up for machining.
The different bar stock is used as a spacer only.
Than the computer was allowed to start the chip making mode.
One time tool changing and the hole pattern is dependent on the waterjaket and outer shape.
Ready to clamp the next part of 5.
And the swarf all over.[size=78%] [/size]

[FKreider]

Very nice work as always!

[fumopuc]

Hi Frank, thanks for popping in.


The water jacket covers are made and the cylinder heads are prepared for the soldering operation.
First part is soldered but there is some space to improve, this time I have given lees, but too less silver solder to the part.
The gap is not really filled up complete.

[fumopuc]

Hi everybody, as mentioned before the soldering has to be improved, but I wanted to know if this water jacket is really sealed.
Picture 26 is showing the small, not desired gap around the cover after the final machining of the surface.

So a quick an dirty jig was made to get air pressure to the water jacket.
Leak detection spray should give the final answer and I was surprised, that no bubbles could be  seen.
So I will try for the remaining 4 heads to use more silver solder in the process.


Next step was to check the hole pattern.
My fifth cylinder head, the set up part from making all cylinders earlier, is equipped with some studs already, so a good opportunity to check the fit.
That was looking fine so far.

[Admiral_dk]

Nice progress Achim 

I must admit that I'm not sure about the desing of the heads ...  ... but I'm sure I will be wiser when you get closer to the finished items.

[fumopuc]

Hi Per, thanks.
Are you struggling about this picture ?
http://www.modelenginemaker.com/index.php?action=dlattach;topic=7527.0;attach=121584;image

[Admiral_dk]

Hi Achim

No that one explains it nicely - I had just completely forgoten that you posted it sometime ago 

[Don1966]

Always Nice work Achim. If you Suspect leaking one thing I would do is test it at the engine running temperature since there will be some expansion of the metal.


Regards Don

[fumopuc]

Hi Don, good idea, thanks.
Hopefully I will get it managed to do a proper soldering process for the next heads and than there will be no doubt about any leaking anymore.


Since one and half year there is the S/S Sata distributor in my shelf now.
Now I took the opportunity to implement this part into the CAD model.
As delivered it looks horrible.
Functional necessary is the cap only, because there is no Hall or other sensor in it.
So I have to design a much smaller lower part for it, but this will come later.
Main reason for my action here was to research the space around the distributor and it shows what was assumed already.
The old golden engineering rule "Where there is one body there cannot be another" was confirmed.
So I have to redesign the cooling return from the heads to the radiator.

[fumopuc]

Hi everybody, here the redesign of my cooling pipes, specially the return to the radiator and water reservoir.
A wooden cover for the water reservoir also is taken shape.

[fumopuc]

CAD design is nice, but real parts are better in my eyes.
So it was time to swap to the "brown stuff" and to do some wood work by making the cover for the water reservoir.
A simple jig and starting with 5 x 3 mm strips of wood for the supporting structure.
The next layer some 4 x 4 mm strips.
Everything fixed with wood glue.
Finally painted with some oily wood stain, same I have used for my patio last summer.
The top layer is made by the same mahogany strips I have used for the floor.
Last action missed here, the cut out for the water return pipe, so this pipe should be made next.