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Tom Stranko
| | Posted on Thursday, November 28, 2002 - 07:53 pm: | 
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Interesting inboard with a mechanical rotary intake valve. No date in catalog. I would guess
1915. 3 illustrations to follow of a One, Three cyl. engine and the valve mech. |
Tom Stranko
| | Posted on Thursday, November 28, 2002 - 07:53 pm: |
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Tom Stranko
| | Posted on Thursday, November 28, 2002 - 07:55 pm: |
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Tom Stranko
| | Posted on Thursday, November 28, 2002 - 07:56 pm: |
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Ernie
| | Posted on Friday, November 29, 2002 - 09:40 am: |
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This is another example of the more things change the more they stay the same. All 3 port (piston port) 2 stroke engines are symetrically timed. Meaning the port opens exactly opposite of where it closes in relation to crankshaft degrees. Example would be the the intake port opened at 100 before TDC then it would close at 100 after TDC (degrees) For optimal operation in most cases the intake would want to be assymetrically timed. In other words The opening and closing have nothing to do with each other. So the engineer could build the engine with the port timing he wanted. There were many types of rotary intake valves tried in the early years. None of them had any longivity. Not until the 60's or 70's did any one make a successfull rotary intake valve engine. I had a Kawasaki motorcycle that had this and it ran much better than it's same size brothers with (reed valves 2 port) or a piston port (3 port engine). The valve disc was of some sort of phoenolic material and lasted longer than the rest of the engine. |
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