answer to cheep advance question

[Sandy]

Looks kinda cool, I will be doing some downloads when I get a chance this
weekend. Might be worth doing some PCB's if enough people are interested.
Will need some modifications of course, just need to figure out what they
are ;-).

Sandy

At 08:07 AM 10/28/98 -0600, you wrote:
>Look at http://www.picnpoke.com/projects/ignition.html 
>
>The kit looks like it will do all you ask for under $50 bucks US. Knock
>sensor input, programed avance with two options, and a tac output.
>
>MCA
>
>
>
>
>Danger  !!   you started my mind working again !
>
>Andy  :-)
>
>Bruce Plecan wrote:
>
>> -----Original Message-----
>> From: am018 <am018 at post.almac.co.uk>
>> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>> Date: Tuesday, October 27, 1998 4:15 PM
>> Subject: Re: Re : Home-brewing an ignition advance control
>>
>> >I missed the start of this thread  -- I am pretty interested as one of
>the
>> >ideas I am kicking around at the monent is a knock retard device for
>> classic
>> >50s & 60s cars designed to run on 101 octane fuel what we called 5 star
>in
>> the
>> >UK    --- basically idea just to put  few degrees spark delay in when
>knock
>> is
>> >detected. The first part is a simple stand alone knock detector module.
>I
>> know
>> >things like this have already been done but as far as I know none is on
>the
>> >market at the moment.
>>
>> MSD, and J+S sell them.  Also could use a gm knock sensor/esc to
>> trigger a MSD multi step retard.
>> Bruce
>>
>> >Andy Macfadyen
>> >
>> >Donovan_Dibble at ittauto.com wrote:
>> >
>> >> Al,
>> >>
>> >> I've been thinking of making a similar system.  I want (am) going to
>use
>> a
>> >> PIC 1674 uP for the 'brains'.  This micro has built in A/D for MAP,
>TPS,
>> >> etc.
>> >> This will hopefully make the system more compact.  Although I haven't
>> >> worked
>> >> on it in a while, I planned on starting by collecting data from a
>> 'regular'
>> >> HEI distributor with vacuum/mechanical advance and simply implementing
>> that
>> >> strategy into the micro.  Later, the knock sensor input and associated
>> >> retard
>> >> logic would be added.  I think the easiest (or most straightforward)
>way
>> of
>> >> detecting knock will be with external op-amp filters rather than
>> >> calculating
>> >> Fourier Transforms within the micro.  Any signal conditioning would
>also
>> be
>> >> taken care of with the op-amps.  I got as far as getting the vacuum
>vs.
>> >> advance data for the HEI but haven't taken it any further.  If you or
>the
>> >> list
>> >> have any other ideas, I'd like to hear them.  Any motivational ideas
>> would
>> >> be
>> >> welcomed too :)
>> >>
>> >> Don
>> >>
>> >> >I have been pouring over the HEI 4-pin and 7-pin diagrams and info on
>> this
>> >> >page.  The amount of info that is to be found on this page is
>FANTASTIC!
>> >> I
>> >> >am trying to figure out how to make an ignition advance control for a
>GM
>> >> HEI.
>> >> >I know MSD sells one but I would like to make my own if possible. 
>It's
>> a
>> >> lot
>> >> >more satisfying that way and I learn alot more.  Is this done with an
>> >> >adjustable timer IC or is it some other kind of signal conditioning.
>> >> >
>> >> >Any Ideas???
>> >> >
>> >> >Thanks for listening
>> >> >Al Ross
>> >
>> >
>	
>