atomization enhancement

[Matt S Bower]

Actually the Cummins system they are talking about is absolete
nowadays.  Cummins does use bosch fuel system quite a bit and those
presures ate in line for Cummins just the same.

Fredrik Skog wrote:
> 
> On Fri, 7 May 1999, Howard Wilkinson wrote:
> 
> First: I live in europe and we don't use the unlogical imperial
> measurements and I have double checked these figures and it says bar not
> psi. Second: I have the "Bosch Automotive Handbook" in my hand
> right now and it says that Bosch common rail uses pressures of up to 1600
> bar in their common-rail systems.
> Third: I have actually driven these vehicles and they work, and they work
> very good, you can't believe it is a diesel engine when you drive it.
> 
> This is not bad information, and just because Cummins don't have a way to
> achieve these pressures don't mean that others don't...please, we live in
> 1999 now and technology are still getting better. And remember that all of
> these engines where presented to the market last year or this year so they
> are very new.
> 
> > James:
> >     I'm firmly in your camp.......Statements recently made about
> > Cummins and other engines are absurd.  Either someone is mixing up
> > decimal points or mistaking bar for PSI.  I can speak from experience
> > with Cummins common rail systems when I say that they are nowhere
> > close to these numbers (I've guaged them).  Also The injector pop
> > pressures of most diesel engines I've worked with would make me think
> > that someone is mistaking bar and psi pressures.  1500 psi would be a
> > reasonable breaking pressure for a typical injector, and 4k-5k psi
> > would be a very high pressure injector.  I believe that Cummins B
> > series and C series engines (not common rail) operate in the latter
> > range.... don't quote me here as I have only hearsay numbers on these.
> > There is no way on God's earth that a CAV, Roosamaster, or Stanadyne
> > rotary pump can produce the pressures people have been throwing about,
> > and I have grave doubts that any of the piston pumps can do this
> > either.  There is no doubt that diesels develop more power with better
> > atomization, and run more efficiently.... as do gas engines...this has
> > long been known, but pressures of 20,000 psi are not only difficult to
> > achieve, but EXTREMELY DANGEROUS.  The only safe way to achieve these
> > kind of pressures safely would be to do it with an injector which did
> > the pumping so that there was no danger of line breakage.
> >     We are being deluged with bad information here, but unfortunately
> > I have no way of convincingly refuting it.  In my opinion it's utter
> > nonsense!!    H.W.
> >
> >
> >
> > >> I just looked this up. All the new german diesel engines use
> > >> common-rail
> > >> (BMW, Audi, Mercedes) and uses a pressures of approx 1350 bar.
> > >> VW has a new diesel at 1.9 liter that uses one separate diesel
> > >> pump/cyilinder and uses a pressure of 2050 bar. According to all
> > these
> > >> manufacturers the higher the pressure the better the combustion.
> > >
> > >1350 BAR!?!  2050 BAR?!?
> > >
> > >20,000psi and 30,000 psi?  Tell me there's a missing decimal
> > >point, or a units mistake here. 13.5 and 20.5 bar sound more
> > >believable.
> > >
> > >james montebello
> > >
> >
> >
> 
> ------------------------------------------------------------------------------
>         Student at the Department of Computing Science Umeå University
> 
> Fredrik Skog                        E-mail:   c95fsg at cs.umu.se
> Taffelstråket 51                    WWW:      http://www.acc.umu.se/~skog
> 903 53 Umeå                         Phone:    +46-(0)90-136365
>                                     Mobile:   +46-(0)70-3041729