Engines > Restoration of Model Engines

A messed up Stuart no.8 Mk I

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vtsteam:
My guess then is that the core broke inside the cylinder and twisted. The passageway stayed connected however because these cores probably had a piece of wire inside to reinforce them. After the pour the sand core falls apart and the wire is withdrawn. Still, if it's a single break there will be some misalignment between the two rectangular channels. I guess the original builder might have cleared some of this with a needle file or other tool, or maybe they had enough overlap to work as is.

Jasonb:
The Stuart cylinders usually have a "Z" shaped core the comes out into the side of the cored bore rather than the end so it may have moved quite a lot, though being an older engine maybe they did come straight out the end and it has just twisted and not reduced the cross section anywhere along it's length. The other end of the Z forms the port

Sanjay F:
I'm now trying to visualise what that 'z' shaped core looks like in situ ...... and failing miserably!  :facepalm:  :Lol:

vtsteam:
From Terry Aspin's The Backyard Foundry:

1.) The port core
2.) The cylinder and port cores assembled -- this is for the type Jason mentioned with the port coming into the side of the cylinder.

(Sanjay, if yours was an older style, per Jason that went to the end - it might have been more "C-shaped" or "L shaped" of  straight segments)

Sanjay F:
That's what I needed, thank you ;) - spatial 3-d vsiualising is not on my skills list!  ;)

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