Another Knucklehead, built via castings, as a Draw-Tech design, upscaled

[Foketry]

After seeing the construction done by Mayhugh, I also decided to build this interesting engine in a slightly larger scale.
The pistons of my engine will be 36 mm instead of 1.063 inch (27mm) and everything else will consequently be increased by the same proportion.
I have followed and studied all of Terry's posts, whose technique and precision I admire and I hope to obtain a well-functioning engine like his.
I also asked Terry for some 3D drawings and he kindly provided me with some ,I started from these drawings
After the 18-cylinder Isotta Fraschini, I returned to simpler engines, just 2 cylinders, even if Terry writes that it is not that simple

 

[Foketry]

To make aluminum castings the first step is the 3D drawing of the finished part, then I eliminate all the holes and machining, add the allowance in the milled or turned areas, add an increase that takes into account the aluminum shrinkage .


Finished right crankcase

drawing for casting mold

3D printed mold with parting powder

I generally paint the mold to obtain smoother surfaces but in this one I didn't paint

the sandblasted casting

 

[Foketry]

Other aluminum castings, always with the same procedure , 3D project, plastic model, cast in red sand

Cover cam box and Cam box

 

[Foketry]

left crankcase

 

[GreenTwin]

Very nice casting work !
.

 

[ozzie46]

looking good.

Ron

 

[Foketry]

The flywheel, brass casting

 

[GreenTwin]

That casting turned out really well.
Do you know the alloy type that you used ?
.

 

[Foketry]

That casting turned out really well.
Do you know the alloy type that you used ?
.

It is brass obtained from old taps , I don't know what brass alloy it is, but no particular mechanical properties are required in this flywheel