Man , Frank !
You are like the knowingest guy I know about all the technical details of
the stuff !
I certainly appreciate all the effort and knowledge you bring to the DML ,
as I am sure everyone else does too !
Thanks !
At 03:48 PM 10/9/98 -0700, you wrote:
>Below are some facts about fuel injectors that I thought everyone might be
>interested in.
>Currently fuel injectors fall into two general classifications, low
>impedance (1 - 2 ohms) and high impedance (12 -16 ohms). Within these two
>classifications, there
>are two general types, pintle and plate. Each manufacture claims advantages
>to their respective types. Generally, all injectors have pretty much the
>same physical
>and electrical connections. Dodge uses a Seimens injector on the Magnum
>engine ( I checked the 1998 5.9L Magnum). The Dodge P/N for the 98 injector
>is
>53030778 and that is the same Seimens P/N. The injector saturates at 232
>cc's (approx. 82% cycle duty) and it is the high impedance type. The flow
>rating
>translates into approx. 22 Lbs/Hr. Little know fact, Chrysler owns Seimens.
>Currently Seimens, Bosch, Lucas, Rochester, and Bendix make high impedance
>injectors with this flow rating (232 cc's). The next step up from all of the
>above manufactures is a flow rating of approx. 245 cc's and the step above
>that is approx.
>270 cc's. The 270cc flow rating translates in approx. 25 Lbs/Hr. All of the
>above manufactures (with the exception of Lucas) manufacture the pintle
>style injector
>with production tolerances ranging from 5% to 10%. The exception on
>tolerances comes from Lucas which advertises flow ratings within 1%
>additionally the plate
>injectors (identified by multiple holes in the nozzle) saturate at approx.
>87% cycle duty. I just purchased a set of the 270 cc injectors to try with
>the big bore TB.
>Calculations show that these injectors should be good for about 330
>horsepower. The only question surrounding these injectors will be whether or
>not the O2
>sensor can reduce the pulse width enough to not be rich at an idle. If it is
>rich at an idle, then the only option will be to drop down to the 245 cc
>injectors. Again all
>of the above manufactures have these flow ratings as off the shelf items, it
>is just a matter of knowing where to get them. I ended up purchasing a set
>of Lucas
>injectors this time and I watched them being flowed, high was 271.1 cc's and
>the low was 269.6 cc's. We did flow the above Dodge injector. Once we know
>what
>injector works best, we might be able to get a group buy going, but
>currently for a set of eight, my price for the balanced set was $400.00 or
>$50.00 each. One
>last thought, all of the above manufactures flow the above injectors at 43.5
>PSI and should be safe all the way up to 70 PSI (sometimes a little higher).
>I hope this
>information helps......
>
> Frank
>
>
W . Jack Hilton III
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