fuel rail

[Walter Sherwin]

The desired I.D. of the injector rails is as much a function of the gross
recirculating flow rate (ie: the max bypassed flow rate, when the injectors
are at low BPW's) of the entire pumping circuit, as it is the peak draw of X
number of injectors for a given rail.  Surges and pulsations are best
emeliorated with rail mounted snubbers or dampners (Bosch have some nice
ones).  As long as your rail I.D. is about 30-50% larger than the I.D. of
the lines feeding it, then you should be golden.  The necessity of excess
hydraulic rail volume is only an issue when feeding a very long rail, that
in turnfeeds a number of synchronously batch fired injectors.  IMO

Walt.




> Like someone else mentioned here earlier, there is no sure fire way to
know
> the correct inside diameter,,,lot's of variables.... if you are making
your
> own use as large as you can and you might even think about a fuel dampener
> as well.  Datalogging the pressure in the rail under conditions is the
only
> way to know if you have a harmonic problem. hth's
> -Carl
>
> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Seth
> Sent: Thursday, March 08, 2001 8:31 PM
> To: diy_efi at diy-efi.org
> Subject: Re: fuel rail
>
>
> http://www.rossmachine.com/racing/
>
> these guys make custom 16v VW fuel rails from billet. you might want to
> see what they have done.
>
> -Seth
>
> Nigel Heron wrote:
> >
> > hi,
> >
> > i'm going to be making a custom fuel rail for my 16v vw out of billet
> > aluminum.
> > What is the appropriate internal volume of a fuel rail? is there a basic
> > guidline based on injector size, fuel pressure, max rpm, etc.?
> >
> > thanks,
> > -nigel.
> >
>
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