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A forum for all things technical regarding Dobles or steam cars in general.

Turbine Fan

Upon stripping the Fan Turbines I found several problems , from worn bearings , rusted pipes, damaged turbine sections and even labyrinth rings completely missing from one unit ! the close up of the centre of one of the main turbine section

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Last reply by alsancle·6d

New expansion links

We discovered that the expansion links were worn in one engine and broken in F30 so decided that all the engines were probably in a similar condition and set about making these parts. these parts are now ready for heat treatment and then gr

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Last reply by alsancle·6d

draft booster motors

When you start a project and just assume an electric motor is not going to be a problem......... then it becomes apparent they do not exist. after calling 3 companies that advertise bespoke motor manufacture, to discover that they only modi

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Last reply by alsancle·1w

carburettor parts 3d milling the air intake diffuser

the video tells all, a really awkward shape I thought we may have to just sculpt by hand with a grinder

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Last reply by Chris·1w

electrolysis

Wow!!! just shows you that not all great ideas are great ideas. at some point in time someone decided an electric water tank level gauge would be a good addition, so they fitted a standard gasoline tank level one, these have an open variabl

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Last reply by alsancle·1w

carburettor update

we have been machining components all week and almost have a complete carburettor as well as progressing well on the draft booster motors ( pics to follow on a separate post) This one is assembled using a new float bowl lid but an original

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carburettor update

someone once said to me that it was always worth taking some time and make fixtures for holding awkward shaped parts, how true, this fixture locates on the taper of the carburettor, with some screws to ensure it does not spin on the nose an

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More engine work see previous videos first

This is a continuation from the previous post called engine work and continues the topic of the neck ring detail and fit plus a little shot of the smaller cnc machines in my shop.

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cylinder block update

these patterns and castings are seriously expensive and I am conscious at all times about how expensive a mistake will be, with this in mind I have decided to 3d print some of the more complex and costly parts, hopefully to catch any issues

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Last reply by Chris·Jun 13

E engine work

I have recorded a number of videos to show ( hopefully) how small errors all add up into big ones, one of the photos shows how the over boring has forced the copper gasket up the bore, and I hope the others are informative

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Last reply by BillSmith·Jun 11