Variable Compression, Variable Displacement you decide

[Clare Snyder]

Roger Heflin wrote:
> 
> >
> > >Again same as above.  The auto books I have read say the biggest problem
> > >with a supercharger is how much power the use at high rpms.  This they
> > >say is the only disadvantage of a supercharger over a turbo.
> >
> > This has been my perceptino as well.
> >
> > Turbos offer much better performance in the mid-high end of the RPM range,
> > simply because they have to spool up based on lower exhaust pressure at
> > lower RPMs.  Superchargers, being belt driven, and most of the time driven
> > by a 1:4 or a 1:8 gear-up system, right off idle are making boosted power.
> > The problem with superchargers, as you said, with a 1:8 planetary drive
> > (for example), your engine sitting at 6000 RPM, your blower is spinning at
> > 6000 * 8 = 48000 RPM.
> >
> > It comes down to application - for a street car with not so high RPMs (lets
> > say, around 5k or so), a supercharger is great.  Turbos tend to be better
> > for road racing and/or tracks of that sort.  Of course, there are millions
> > of exceptions.
> >
> 
> It occurs to me, that you could make an electric supercharger (big one not
> the little ones some have now) by putting a generator where you would
> normally put the supercharger, and then putting an electric motor
> with the blower part elsewhere.  With a bit of control in the electronics
> you would probably be able to boost the low end (over a supercharger,
> way over a turbo) and keep the high end from getting too excessive.  I
> figure that doing things this way would probably boost the cost of
> a blower kit somewhere around 1500 (big enough generator/motor pairs and
> the control stuff get expensive).  It may boost the cost more, but
> it would be alot more adjustable on the fly, even computer controllable,
> ie knock avoidance by reduction in boost.   It would give the computer
> to adjust both the boost and the advance to be optimal for power, or
> fuel efficency.   I know turbodyne makes small electric blowers, but
> as far as I can see they don't produce the necessary pressure at
> volume at wot at higher rpms, so only boost the lower curve, which
> with some engines (that have bad lower curves) would be a bit help,
> but not on larger engines for any kind of racing.
> 
>                         Roger Heflin
Why not hydraulic? Either way will be inefficient, but electric likely
moreso
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