Just a theoretical question about valves
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  1. #1
    Fellow Frogger! two-oh-philic's Avatar
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    Just a theoretical question about valves

    Can anyone tell me why they don't have a single disc operating two valves.

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    Ie: If a round disc the size of the bore had a sufficiently sized hole which went through say x degrees so that if it were made to rotate it would open up and close off different valves. Rather than something that needs to move up and down this would move in a circle.

    Has this already been tried? Or is it flawed somehow?
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  2. #2
    Banned Haakon's Avatar
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    Been done many times. One good example is a V8 with rotary valve heads used in WW2 german torpedoes. Was designed by Felix Wankel (inventor of the rotary engine who was required to work for the Nazis instead of being able to play with his own projects). The rotary valve head is very compact which was good for torpedoes. This engine was VERY powerful too, as they designed it to run at its limit and at extreme temperatures - because it didnt have to last very long.....

  3. #3
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    The main problem with the other forms of valve (like rotary valves or sleeve valves) is maintaining a seal. The poppet valve still seals as it wears because of its design, so it lasts a long time.


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  4. #4
    Banned Haakon's Avatar
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    some links on the subject

    <a href="http://www.halfbakery.com/idea/Rotary_20Valve_20Engine" target="_blank">http://www.halfbakery.com/idea/Rotary_20Valve_20Engine</a>

  5. #5
    Budding Architect ???? pugrambo's Avatar
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    there were a few rotary valve heads made back in the late 50's and early 60's

    i did a bit of work to one that bolted onto a holden grey motor quite a few years ago

    the bloke was using the motor only for drag racing

    sealing was a problem for them
    dunstan was one of the heads that were made

    i'd still like to work out a solenoid operated valve head for a pug as i think the options are endless for what ever output you are after

    i brought this up a while ago one here
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