| Author |
Message |
    
Searcher
Senior Member
Username: searcher
Post Number: 442
Registered: 10-2004
| | Posted on Tuesday, July 06, 2010 - 10:51 am: | 
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Here is a interesting, simple, reversing mechanism. Article says it was used in stationary applications but I have not seen one to date. I wonder why it wasn't adapted to marine use as that is the obvious application. Undoubtedly, there is some inherent problem that prevented wide spread adoption.
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J.B. Castagnos
Senior Member
Username: jb_castagnos
Post Number: 544
Registered: 07-2002
| | Posted on Tuesday, July 06, 2010 - 08:15 pm: |
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It looks like it would only work with atmospheric intakes, re timing a cam with intake and exhaust valves wouldn't work, the cam would have to be driven in the opposite direction, gear vs chain drive or two gear vs three gear. 1916 would have been the end of these type engines, most marine engines had mechanical intake and exhaust by this time. |
Andrew Munns
New member
Username: johnoxley
Post Number: 3
Registered: 04-2010
| | Posted on Tuesday, July 06, 2010 - 08:36 pm: |
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Hi - I try to link with C1916 technology - all steam propulsion and early diesel engines were solid coupled to the prop hence fully reversing. Locomotives were fully reversing. Marine beam engines were also slip eccentric reversing (with hand operated valves for starting). Smaller motor boat engines were often solid coupled. Wotif the device only shows one of two cam drives? Then a single cylinder would be reversing... |
J.B. Castagnos
Senior Member
Username: jb_castagnos
Post Number: 546
Registered: 07-2002
| | Posted on Tuesday, July 06, 2010 - 11:25 pm: |
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Andrew, if the engine had seperate cams for intake and exhaust you could re time both for reverse. My Fisherman has one cam for exhaust and an atmospheric intake that is re timed automatically. There's an ad for the engine in the post below that says it was the only reversible four cycle in 1916.
http://www.oldmarineengine.com/discus/messages/1/2225.html#POST4206 |
John Davis
Senior Member
Username: johnny
Post Number: 384
Registered: 03-2006
| | Posted on Wednesday, March 02, 2011 - 10:36 am: |
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My dad has a stationary hit & miss 6hp Galloway engine that has this cam feature. I believe it is like JB said with a atmospheric intake valve. (floating valve with light spring)
To change direction you have to shut the engine down remove a pin in the cam rotate the cam and re-pin to a different hole position. Not a fun thing to do on a hot greasy engine. |
