555 EFI

[Don.F.Broadus at ucm.com]

I have the basic circuit ready to fax to you , I just need your fax number
 
Thanks Don

> -----Original Message-----
> From:	Clarence L.Snyder [SMTP:clare.snyder.on.ca at ibm.net]
> Sent:	Monday, January 18, 1999 7:57 PM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	Re: 555 EFI
> 
> Don.F.Broadus at ucm.com wrote:
> > 
> > When I was at a Research Lab we used a circuit to run the Dyno engines
> so I
> > know it works. I cant scan it but could fax it to
> > someone who could. The circuit triggers from dist pulses from the HEI
> module
> > REF lead to a cd4013 Flip/Flop and cd4538 Dual monostable. The Q output
> of
> > the 4013 goes to pin 2 of a 2 input And gate cd 4081. The Not Q goes to
> pin
> > 5 of the 4081. Pins 1 and 6 of the 4081 are tied together and go to the
> Q
> > output of the 4538. The pulse width is controlled by a 100K pot and .1
> mfd
> > cap on pin 2 of the 4538. Pins 4 and 3 of the 4081 go to power
> transistors
> > that fire the injectors. 10K resistors are in series with the base of
> the
> > transistors.  A Throttle position sensor can be used  in place of the
> 100K
> > pot and will vary the pulse width from  approx .5 to 10 Msec. If the TPS
> is
> > 10K add resistors on each end of the pot to get 100K total. Place a
> switch
> > on the Bypass line of the HEI, open to start, Ground to run.  Now to the
> > part I haven't tested yet. A FORD MAP sensor outpus a frequency in
> relation
> > to the Vac present. Connect the output of the FORD MAP  to the HEI
> module
> > EST input. After the engine starts flip the switch to RUN and the FORD
> MAP
> > will output about 160 Hz to the HEI mod. This should advance the timing.
> As
> > you Rev the engine the Freq. will go down and  retard the timing. If you
> > want to add a coolant sensor and rather use a Voltage output MAP. Use a
> > Summing amp config on the input of the monostable and a VCO to control
> the
> > timing. Just my .02$ for a circuit that will run a engine for testing at
> a
> > junk yard or on a stand.
> > 
> >                                                             Don
> > 
> > > -----Original Message-----
> > > From: AL8001 at aol.com [SMTP:AL8001 at aol.com]
> > > Sent: Friday, January 15, 1999 8:45 AM
> > > To:   diy_efi at efi332.eng.ohio-state.edu
> > > Subject:      Re: 555 EFI
> > >
> > > In a message dated 99-01-15 09:33:21 EST, nacelp at bright.net writes:
> > >
> > > > I'm looking to keep this as much as an entry level thing, meaning
> > > >nothing but 555s, op-amps, and a final drive.
> > >
> > > Something like this would be great for testing junk yard engines or
> > > moveing a
> > > car that's a "work in progress" when the ECM and related parts are
> gone.
> > >
> > > Harold
> I'm intersted, and I have a scanner if you want to fax it to me drop me
> a line off list and I'll give you my fax line #.