Just a theoretical question about valves
  • Register
  • Help
Results 1 to 5 of 5
  1. #1
    Fellow Frogger! two-oh-philic's Avatar
    Join Date
    Feb 2003
    Location
    Glen Waverley, Melbourne
    Posts
    419

    Just a theoretical question about valves

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

    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?

    Advertisement
    205 GTi (S2 ) rolled

    '96 306XR "Sex" Black

  2. #2
    1000+ Posts Haakon's Avatar
    Join Date
    May 2002
    Location
    canberra...
    Posts
    8,651
    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.....
    I tried to drown my sorrows in alcohol, but the bastards learnt how to swim

  3. #3
    1000+ Posts
    Join Date
    Jul 2001
    Location
    Perth, Western Australia
    Posts
    6,248
    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.


    2003 PEUGEOT 206 GTi

  4. #4
    1000+ Posts Haakon's Avatar
    Join Date
    May 2002
    Location
    canberra...
    Posts
    8,651
    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>
    I tried to drown my sorrows in alcohol, but the bastards learnt how to swim

  5. #5
    Budding Architect ???? pugrambo's Avatar
    Join Date
    Jul 2000
    Location
    Parkes - N.S.W - Australia - Earth
    Posts
    12,256
    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
    3 x '78 604 SL

    1 x '98 306 GTi6

    1 x secret project

    1 x '98 406 STDT troop carrier and i don't care if it stinks, i don't sniff it's arse Death by wank tank

    1 x '99 406SV 5spd wagon, time to burn more fuel

    1 x 1994 605 SV3.0


    WTD long range fuel tank for 605

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •