Home-brewing an ignition advance control

[cudabob at workmail.com]

Al, 

I just picked up (purchased) a "programmable EI system" from an 
outfit in Australia. (KitZ). It is based on a PIC 16C84 and features 
multi cylinder choices, dual programmable advance curves and 
other nice features. But I digress....Tony Nixon who wrote the 
program, willing shares his concepts and even a copy of the 
original code is/was on his home page....something or other 
"picknpoke". 

The basic idea is to lock both the advances (mech  & Vac) at full 
advance, set the distributor at 45 deg BTDC and delay firing the 
coil by a calculated time, based by rpm. Simple eh?

CudaBob

>From: ARoss10661 at aol.com 
>Date: Mon, 26 Oct 1998 22:03:34 EST 
>Subject: Home-brewing an ignition advance control  

>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
>
>http://members.aol.com/aross10661/projects.html 

Bob Cuda-65 - Angels Camp, Calif.
cudabob at workmail.com
http://www.goldrush.com/~rhuish/