Tony, don't forget to take the square root of that driven/test pressure.
That would put them at ~22.5# with a rail pressure of 50 psi.
Another data point: I currently run Design II Accel 24# injectors in my R/T.
Purposely changed the connectors out some months ago in anticipation of
eventually going to 36# FMS units. For those that don't know, you can't get
the newer Design III in larger sizes just yet, so it was the only option.
LTFT is right close to -25 with these 24 lb units. You do the math. Does
that suggest 19 or 21 lb injectors are a better fit?
BTW, that's with a 215/218 @.050 .521 lift cam, heavily ported 2.02 R/T
heads, 52x55mm TB, M1 intake, full exhaust, etc. Still think an injector
upsize is an absolute necessity for heavy mods????? Caveat: the truck
doesn't get alot of WOT work in it's present condition.
I've never seen a definitive for where the 21# figure came from. A book is
nice, but eventually you have to put it down and get in the real world. I've
seen Bernd's posting and once I wade through the confusion I see a spec for
the injector flow rate and I see a spec for the fuel pressure. Two different
specs, not two parts of the same spec. An injector is assumed to be rated at
43.5 psi or 3 bar(industry standard) unless otherwise stated.
Real world testing was done yesterday with a brand new injector for an '02
Ram 5.9L application. Take it for what it's worth.
All done.....now back to your regularly scheduled programming :-)
Bob
> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net
> [mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of Tony
> Cellana
> Sent: Thursday, August 21, 2003 7:18 PM
> To: dakota-truck@dakota-truck.net
> Subject: Re: DML: injectors
>
>
>
> Rough math (ballparking it) puts the 01/02 injector at 24.1
> in our trucks
> then.
>
> driven pressure/test pressure * rate at test pressure
> (50/43.5) * 21.0 = 24.1....
>
> TonyC
>
>
> -----Original Message-----
> From: Bernd D. Ratsch <bernd@texas.net>
> To: dakota-truck@dakota-truck.net <dakota-truck@dakota-truck.net>
> Date: Thursday, August 21, 2003 9:53 PM
> Subject: RE: DML: injectors
>
>
> >
> >Oops...that should state as follows:
> >
> >Engine Years Flow rate in lb/hr
> >5.9 Magnum 93-95 24.5 - Factory Fuel Pressure (40psi average
> - spec is
> >35-45 psi)
> >5.9 Magnum 96-00 23.2 - Factory Fuel Pressure (50psi average
> - spec is
> >49psi +/-5)
> >5.9 Magnum 01-02 21.0 - Tested @ 43.5psi (Outside source)
> >
> >Sorry for the typo - pasted in the wrong spot.
> >
> >- Bernd
> >
> >
> >
>
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