[Diy_efi] EGR and Valve phasing/lift

[Brian Michalk]

If you could make the rotating valve out of carbon fiber, then it would be
self lubricating.  The contact forces wouldn't seem to be too high.

> -----Original Message-----
> From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org]On
> Behalf Of Alexei Pavlov
> Sent: Tuesday, December 17, 2002 3:39 AM
> To: diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] EGR and Valve phasing/lift
>
>
> pedward at apsoft.com wrote:
> >
> > Ok, so admit I didn't know the full reasons for EGR.  The
> predominant reason
> > I heard was the unburnt HC in the exhaust being used to
> supplement the fuel
> > injected in the first place.  The inert gas explanation sounds
> like the rest
> > of the picture.  Mind you my explanation came from some early 80's 5.0l
> > literature (carbed), a little blurb in a repair manual I think.
>  In any case
> > the EGR is a beneficial tool for fuel efficiency.
> >
> > On variable valve lift, etc.  The problem is that valves are
> old and cause
> > problems.  What I was thinking was making a custom head with 2 cylinders
> > in the exhaust and intake tracts that rotate to allow gases
> through.  You
> > essentially have a cylinder big enough to flow the full
> intake/exhaust flow
> > when turned to 90 degrees, but blocks off the flow and seals
> the combustion
> > chamber when at 0 degrees.  You could crudely control these
> with a camshaft
> > and follower mechanism to initiate a positive locking (kinda
> how desmo works).
> >
> > Ultimately I'd want either a stepper control or a cylinder that
> can be moved
> > in and out ala Mikuni slide carb with solenoid control.
> >
> > You could eliminate the intake tract restrictions using this
> type of mechanism
> > and it is easily expandable to full airflow control.
> >
> > I may pursue this approach for a B&S motor or some other small
> 4 stroke motor
> > (maybe a motorcycle single).
> >
> > Also, if you made the rotating cylinder large enough and
> located it correctly,
> > you could just directly spin the cylinder with a timing
> chain/belt.  Since
> > the camshaft moves half the speed of the crank, you could cut
> passages into
> > the cylinder to pass/nopass gases when you wanted.  The other
> benefit I see
> > is that the combustion chamber could be make smaller using this
> technology
> > and you'd see a higher CR.  Perhaps it would also lend itself
> to lower deto
> > because of smooth contours.  There are lots of ideas to be
> tried with this
> > method of valving gases.
>
> It seems to me that all these systems were used in the beginning of the
> 20th century :-) Also VW have used them on SI engines.
>
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