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One Cylinder Double-Acting Engine |
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| After playing with my implementation of Paul Krieg's single acting opposed engine for a while, an inspiration struck me that instead of using two of the old single acting cylinders perhaps I could replace them with just one of the new double acting types. | |
| Stage 1 | |
| So I did a bit of re-engineering on the model and as Archimedes would have said, eureka! it worked with the same timing set-up using the eccentric valve gear. And almost just as fast too. | |
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| The two old type single-acting cylinders have been replaced by one of the new double-acting type. | Everything else remains unchanged. It works with the same eccentric gear and timing. |
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| Stage 2 | |
| I experimented with different ways of connecting the tubing and placement of the eccentric linkage and I believe I have all the solutions which, of course, I have to take pictures and write them up. | |
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| Cams are being used for the crank in place of the 24T gears with axle holes which are no longer produced. These gears tended to break easily. | The eccentric gear has been eliminated and the valve is driven directly by the crankshaft. |
| Stage 3 | |
| Best of all, it also worked with the pulley valve gear that I used for my 2-cylinder oscillating engine. Also as a result, I have saved two old cylinders to be used to build Paul's monster 6-cylinder radial engine. It's difficult to get hold of the old type cylinders as they are long out of production. | |
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| The 40T valve gear has been replaced with the simpler pulley wheel valve gear. It was necessary to shift the valve mounting down to get the required 2 1/3 height spacing. | Note the orientation of the cam, pulley wheel and 3/4 pin which sets the timing for the engine to run properly. The crankshaft will rotate anti-clockwise with this arrangement. |
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| My cylinders have an ID - I'm doing a study to see how long they can last. | How the tubings go from the valve to the cylinder. |
| Stage 4 | |
| Finally, here's a nicer looking version of the single cylinder engine. | |
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| The flywheel is more streamlined. | Note the valve linkage, the crankshaft will rotate clockwise in this arrangement. |
| Conclusion | |
| So now there are two of the single cylinder double-acting engines in existence: Per Arne Rikvold's with the unique pendulum valve gear and this one which uses a conventional pulley valve gear. | |