engine/turbo theory question

[Ameer Antar]

All in favor of killing this thread!!!!

enough already...i could say a lot more things, but I won't. ;>


At 06:04 PM 10/17/00, you wrote:
>Thanks for the reply Simon,
>   Thats interesting about the spiral groove, I didn't know that.
>What I've noticed though with turbo's is even with High
>compression 10vt's, higher than my old NA 4kq,  they still have
>no power till the turbo spools up.  More than the Early MC's but
>not as much as a 4kq.
>l8r
>  Todd
>
>--- SIMON HOLTBY <sholtby at yahoo.co.uk> wrote:
> >
> > --- Todd Phenneger <tquattroguy at yahoo.com> wrote: > No,
> > >   The turbo does hamper flow and cause a power loss.  It
> > just
> > > makes WAY more power than it loses.   If you could have no
> > > restriction at all, you'd get even more power.  Hence the
> > > development by Garret of that Hydraulicly driven turbo they
> > want
> > > to make.  No restriction at all makes for FAST spool up, and
> > > instant full boost at low RPM.
> >
> > Todd,
> >
> > I remember talking to a guy who was a diesel engine designer
> > for Cummins
> > and he told me that the exhaust system is carefully designed
> > so  that the
> > turbo uses a very small amount of power. You know how exhausts
> > are tuned
> > to scavenge from cylinders as the exhaust valve opens well the
> > same can be
> > done with a turbo, some how pulling the gasses through.
> > He told me how some people who had failed turbos were removing
> > them and
> > running N/A but this was destroying the engine as the exhaust
> > was totally
> > out of tune.
> > He also said that it is not the exhaust gas pressure but the
> > heat of the
> > exhaust gas that turns the turbine. I cannot remember his
> > explenation as I
> > was confused by it.
> > Something else he said was that the turbo shaft has a spiral
> > groove in it.
> > This prevents oil from getting past the oil seals, as the oil
> > is 'wound'
> > back in.
> > His latest project was designing a JET engine that can run on
> > coal dust
> > for countries without oil. Its use being for electricity
> > generation (not
> > aircraft!)
> > Biggest problem with turbo engines is their lower compression
> > which means
> > that they are inefficient when the turbo is off boost. I read
> > an article
> > about a new Saab engine with variable compression allowing
> > very high boost
> > pressures without detonation and efficient running at low
> > boost. It does
> > this by raising and lowering the cylinder head, wow!
> >
> > Regards
> >
> > Simon Holtby
> >
> >
> >
> > ____________________________________________________________
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>
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