guys
sorry i also forgot to mention to input your values in as decimals eg
input flow rate of 4L/min in as 4.0 not 4, as I have found it
sometimes doesnt like it.
oh - and also realise the numbers in there are just ones i made up
to ensure it calculated correctly. i would be interested to hear what
you guys in the know calculate when inputting 'real' pressures etc
etc
andrew
> craig pete errol etc
>
> attached is some C code which solves the fluid dynamics relations
> for diameter of fuel hose required to deliver a user supplied fuel flow
> rate, over a user supplied fuel hose length, with a user defined
> tolerable pressure drop.
>
> flow rate, length and pressure drop allowable are inputted by
> changing the #define values near the top. just change your values,
> save then compile and run.
>
> I hope everyone/anyone who is interested has a C compiler - sorry
> but its easier to do such iterative calcs with C.
>
> the calcs assume no bends or height changes, but these shouldnt
> have too much affect seeing as such flow theory is only about +/-
> 10% accurate anyway (i could include their effects if anyone really
> cares).
>
> if anyone has problems/queries with the program or cant compile C
> just email me and I can always input their desired variables in and
> email the results back..........
>
> andrew
>
> From: "Pete & Kath Liebig" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Date sent: Mon, 1 Jan 2001 21:11:01 +1030
> Send reply to: [EMAIL PROTECTED]
> Subject: RE: FJ Fuel line advice needed
>
> > Craig,
> >
> > Sounds fair. Next time I'm fiddling with the fuel system I'll do some
> > experimenting.
> >
> > I still reckon 1/4" lines would be OK though - at 6.35mm that's still 1.35mm
> > larger than the pump outlet, so hopefully that would allow enough for
> > frictional losses. Only one way to find out though....
> >
> > By the way, I did some testing when I installed the new pump and came to the
> > conclusion that one of the most important things to watch out for is voltage
> > drop. Make sure the pump is getting close to it's full 12 volts or flow
> > drops off markedly... I have the figures if you're interested.
> >
> >
> > PL
> >
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]] On Behalf Of Craig Overend
> > Sent: Monday, 1 January 2001 17:28
> > To: [EMAIL PROTECTED]
> > Subject: Re: FJ Fuel line advice needed
> >
> > Pete,
> > one thing to remember is depending on how long the fuel line is, you
> > will see a pressure loss at the outlet end of the line. Just try blowing
> > through a short and long piece of same ID hose and you'll definately
> > notice the difference. So just because the pump will flow 250kW through
> > its outlet doesnt necessarily mean a line X metres long with the same
> > internal diameter or slightly bigger will flow the same. Using a line
> > that is small may flow enough for the engine but is more likely to
> > overload the fuel pump and overheat/wear it out causing failures.
> >
> > To do it properly you would do all the fluid mechanics maths, however
> > alternativly try the following, I have not tested this method as I just
> > came up with it, I havn't allowed for pump efficiency but the following
> > might work.
> >
> > Measure the pump current using an ammetre when loading the pump up to
> > the required pressure using the pressure regulator directly at its
> > outlet. Then install the pump on the fuel line and regulator at the fuel
> > line output and measure the current using the regulated pressure. You
> > should then be able to tell if the pump is being overloaded from the
> > current difference and calculate what % bigger flow rate of line you
> > need.
> > Say at 12V the pump consumes 7.5A at 60psi with no fuel line.
> > Say at 12V the pump consumes 10.0A at 60psi with 5mm fuel line 3 metres
> > long.
> > Ratio difference = 10.0A/7.5A = 1.333
> > The flow area of 5mm diam line = 5mm X 5mm / 4 * 3.142 = 19.637mm�
> > 19.637mm� * 1.333 = 26.177mm�
> > Square_root(26.177mm� / 3.142 * 4) = 5.773mm
> > So Using a 5.773mm diameter line the pump will be much happier with more
> > flow potential and last longer at 60psi.
> > You could alternativly use the fuel pressure difference from the pump
> > outlet to the fuel line outlet to calculate the % bigger flow rate
> > required.
> > Any comments welcome.
> >
> > With any EFI conversion you should test it using a fuel pressure gauge
> > at the outlet of the line after you install it.
> >
> > Craig.
> >
> >
> > Pete & Kath Liebig wrote:
> > >
> > > Bruce,
> > >
> > > The outlet on a Bosch EFI pump from the VL turbo is only 5mm in dia. And
> > > these pumps will support up to 250Kw, so unless he intended getting more
> > > than this from his engine then 1/4" lines should be fine. I know it seems
> > a
> > > bit small, but I really can't see any reason to go bigger than the pump
> > > outlet. Pump inlet dia is another story...
> > >
> > > PL
> > >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED]] On Behalf Of Bruce Ferguson
> > > Sent: Friday, 29 December 2000 20:35
> > > To: [EMAIL PROTECTED]
> > > Subject: FJ Fuel line advice needed
> > >
> > > List,
> > >
> > > A young bloke I saw at the wreckers today wanted a
> > > 1600 fuel line for his FJ conversion. (I was securing
> > > a set of ventilated rotors and twin spots)
> > >
> > > I advised him that it was not big enough and 5/16" was
> > > more on the mark. Was my advise correct and what about
> > > the return line dia ?? the same ????
> > >
> > > Cheers
> > >
> > > Bruce
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Yahoo! Photos - Share your holiday photos online!
> > > http://photos.yahoo.com/
> > >
> >
> >
> >
>
>
>
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