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| Scott Vacuum Engine...... |
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| SwarfnStuff:
Nice work again, as usual David. Perhaps you have discovered a technique for drying these little things out to prevent rust? I realise that you have gone with a graphite piston but the bore would benefit from some hot dry air I think. John B |
| vtsteam:
That's a neat discovery that it runs on hot air, David. And the slide valve is very pretty work! :clap: :bow: :bow: There is no condensation problem with hot air. One could finish a run with a hot air blower and put it way dry, if rusting materials were still used. |
| Stilldrillin:
--- Quote from: SwarfnStuff on December 24, 2014, 01:15:14 AM ---Nice work again, as usual David. Perhaps you have discovered a technique for drying these little things out to prevent rust? I realise that you have gone with a graphite piston but the bore would benefit from some hot dry air I think. John B --- End quote --- Thanks John! :thumbup: I'm sure, the condensation problem was caused by the sheer mass of the cold engine, at English temperature. Once the castings have been warmed up, by another heat source. There is no problem with the flame doing it's job, of only running the engine. There's no drying to do, after a full run. There's no graphite piston made, just yet. I must be sure of the bore's accuracy, before I machine that precious, (rare), piece of graphite. --- Quote from: vtsteam on December 24, 2014, 08:51:44 AM ---That's a neat discovery that it runs on hot air, David. And the slide valve is very pretty work! :clap: :bow: :bow: There is no condensation problem with hot air. One could finish a run with a hot air blower and put it way dry, if rusting materials were still used. --- End quote --- Steve. I was surprised! Only cycling the engine, to introduce heat inside the cylinder through the ports. I realised it was trying to run..... :bugeye: I'm sure there would be no problem with rusting with the original materials. If a warm start up, and long run could be arranged, every time. Thanks for your interest Fellas! :thumbup: David D |
| awemawson:
David, if the piston goes pear shaped I'm sure that I can find another piece for you, so don't 'turn in fear' Have a good Christmas |
| Stilldrillin:
Thanks Andrew. You're a gem! I intend to turn a plug gauge. Now that the bore has been lapped again. Still not sure, if the slightly triangular portion is ok...... :scratch: Very best wishes, from Derbyshire. David D |
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