Electronic valve control

[Clare Snyder]

Gary Derian wrote:
> 
> Its always fun to be creative but these
> ideas for rotary valves, etc have all
> been thought up more than 80 years ago.
> The Darwinian evolution of the internal
> combustion engine has let to what we
> have today.  Spring return poppet valves
> are the best mechanical answer.  Rotary,
> desmodromic, etc have all been tried and
> abandoned.  New technology in
> electronics may lead to a better answer
> but not yet.  Hybrid powertrains are
> reducing the speed and load range an
> engine is required to operate in so
> variable valve timing is less important
> now than before.
> 
> IMO, the best engines of the 80 years
> ago era used sleeve valves.  They had a
> moving steel sleeve between the cylinder
> and piston.  The sleeve had ports cut
> into it for intake and exhaust like a
> two stroke but they ran as 4 strokes.  A
> point on the sleeve moved in a circular
> manner. The holes in the sleeve would
> line up with ports in the cylinder wall
> to create the intake, compression,
> expansion, exhaust.  The sleeve extended
> into the head.  This gave a
> hemispherical combustion chamber with a
> central spark plug.  Another advantage
> was that at no point did the piston stop
> relative to the sleeve.  This improved
> lubrication and these engines lasted a
> very long time.  Even so, the cost and
> complexity of driving the sleeves
> obsoleted these engines.
> 
> Gary Derian <gderian at cybergate.net>
> 
> Fred Breitwieser wrote:
> > So, the next brainy off the cuff idea
> would be to have two holes at the top
> > of the chamber, and the cylinder mates
> with either hole during the
> > intake/exhaust strokes, and in between
> the chamber is sealed as the holes
> > don't line up.
> >
> > Would have to radius all the edges to
> prevent detonation, and the material
> > thickness of the top of the head where
> the cylinder rests would have to be
> > awfly thin, otherwise as you said, it
> would add to the clearance volume.
> >
The Knight system, as in Willies Knight. Beatiful design, but expensive
and noisy.
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