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Post by felixbabble on Jun 25, 2007 9:42:15 GMT
 Hi, does anyone have drawings of the stuart triple expansion marine engine as I am having trouble timing my two engines.I have tried using Stuarts settings but they simply do not work.They both try to start but only go half a rev and then stop.A simple line drawing of the settings would be of great help as the terminology on Stuart's web site leave me only confused.An idiot drawing would suit.Any advice would be appreciated.
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simonwass
Part of the e-furniture
Cecil Pagets 2-6-2 of 1908. Engine number 2299. Would make a fascinating model....
Posts: 472
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Post by simonwass on Jun 25, 2007 12:33:18 GMT
I have the drawings and the 3d diagrams provided with the drawings, I'll have a look for them.
There was also an article in ME a few years ago which may help?
Did you buy the engines with you not having drawings? It may be the builder got something major wrong, are you using enough pressure, a triple on low pressure is a single trying to drive 2 compressors!
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lancelot
Part of the e-furniture
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Post by lancelot on Jun 25, 2007 14:17:04 GMT
Hello Simon,
I too would appreciate any information that you may have on the ''Triple'' valve timing build. Presently working on Stuart ''James Coombes'' and a ''Corliss'' , will keep me busy for a while, but I would like to try the Triple some time.
All the best for now,
John.
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simonwass
Part of the e-furniture
Cecil Pagets 2-6-2 of 1908. Engine number 2299. Would make a fascinating model....
Posts: 472
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Post by simonwass on Jun 25, 2007 16:29:08 GMT
Hello Simon, I too would appreciate any information that you may have on the ''Triple'' valve timing build. Presently working on Stuart ''James Coombes'' and a ''Corliss'' , will keep me busy for a while, but I would like to try the Triple some time. All the best for now, John. PM sent |
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Post by felixbabble on Jun 25, 2007 20:24:53 GMT
Hi Simon,
thank you for your time,it is much appreciated.
I bought both engines from a widow ,the maker sady gone but was a first class engineer so I doubt he made any major mistakes when making the pair (no drawings).They both look to have been steamed ,I have simply tried to run on air ,the one engine will work at 100psi (forwards only) but that does seam high for such a small engine,the other will only do half of one revolution.I can see that he has added timing marks on the eccentric but I have no glue as to where they should be set.I have a good basic knowledge but I fear the triple is beyond my capabilities when reading Stuart's instructions.If I had a diagram,I would be fine.Any drawings would be appreciated,please let me know your costs and I will reimburse you.
Felix
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simonwass
Part of the e-furniture
Cecil Pagets 2-6-2 of 1908. Engine number 2299. Would make a fascinating model....
Posts: 472
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Post by simonwass on Jun 25, 2007 20:51:09 GMT
Hi,
The triple does need a high pressure as its a compound engine. Also it isnt really optimum to run it on air, most probably the LP cylinder will not be doing anything, LP cylinders are designed to run at a vacuum created by condensing the exhaust.
Are you running both engines the same way or do you have them in a hull with one running 'backwards'?
The 'timing' on a Stuart is set by the machined eccentrics, they are 2 machined from 1 casting. The only timing you can do is to rotate a set and check the valve opening, the HP & LP are simple enough but the IP would need doing either semi stripped down or time it with some air on and listen for air being admitted by opening a drain cock.
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Post by Jo on Jun 26, 2007 7:26:50 GMT
The drawings show the eccentrics: LP 120 deg between webs, HP and IP 150 deg between webs. Doug English discussed machining the eccentrics in ME 1st Sept 1995, page 280. But a bit confusing as he describes the HP one being at 120 deg???
Did you guys know that Tubal Cain did a series in the Stuart mag (SIMEC) about machining the triple? I do not have a full copy of the article only the crank machining process.
Jo
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Hi,
