4.3 multi-port fuel injection

[William Sarkozy]

At 10:25 AM 3/26/96 PST, you wrote:
>>>>>> "Jim" == Jim Steck <72614.557 at compuserve.com> writes:
>
>Jim> P.S.  I want to add water injection to one of the turbos
>Jim> . . . anyone have any experience with nozzles and solenoids that
>Jim> will stand up to 50/50 water methanol mix?
>
>The old and crude way was a windshield washer setup, and you change
>the voltage, to change flow. In "Turbocharging" by Hugh McGinas he
>describes some diff setup and making your own jets for it.
>
>
>			Jerry Wills 
>I'll have enough POWER when I can spin the tires at the end of the straight!
>89 FJ DERSLYR,           DoD#500 KotF(Flag)       Mark Donahue, about 917's
>USC/Information Sciences Institute  (USC/ISI)  SoCal (310) 822-1511 x 236
>
>
>
My new boat motor will be using this same technique for detonation control.
I'll be running on gasoline under low power, and then iinject M85 or
water/methanol solution under boost conditions.  My plan is to salvave a
roller-vane fuel pump from a port fuel-injected junker.  These units usually
put about 80-90 PSI.  Normally the pump won't run.  At about 0" manifold
absolute pressure, I'll start the pump, the pressure being regulated by an
adjustable orfice (needle valve) in the return line.  My DFI system has an
additional output to interface to a nitrous oxide system.  When a programmed
combination of throttle position and boost conditions are met, the output
goes high.  I'll set it for about 10 PSIG and use this output to open a
solenoid valve to the supply jet(s).  Here's where I'm lost.  My turbo man
says to build a plate to sandwich behind the throttle body on my GM TPI
system and inject there.  I can only imagine the rear cylinders getting most
of the juice and melting pistions in the front.  The alcohol will not be
totally vaporized and will therefore have some inertia, no?  It would be
relatively easy for me to add individual jets in the runners below the
plenum.  I think this would be a superior setup.   Another concern is the
water/methanol mix.  I'd like to use M85 (15% gasoline, 85% methanol) and
adjust my fuel map to cut back on the gasoline at WOT while I add the juice.
Several people have expressed concerns  about the different flame
propogation rates of methanol versus gasoline.  Incidently, the DFI unit
also adjusts the ignition lead (plus or minus, programmable) when the
nitrous-oxide interface output is high.  I suppose using a water/methanol
mix really doesn't add fuel, but only acts as a detonation deterrant?  If
anybody has any ideas on this or has done something similar, I'd like to
hear from  them.

                                                                Bill