Home-brewing an ignition advance control

[am018]

Depends on the design of the cap and rotor arm but 45 (crankshaft)
degrees
sounds too much to me --- might cause starting and crusing problems --
25
to 35 would be sound about right. Most cars with fixed distributers use
rotor arms with wider contact tips.
Andy MacF

Bill the arcstarter wrote:

> Cudabob wrote:
>
> >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".
>
> Sounds like great fun!  Does anyone have a url/email address for this?
>
> I'm contemplating something along these lines myself.  Where can I get
> the fittings which connect to the back of injectors?  Seems like all
> injectors are designed to plug into a special fuel rail, etc...  Hints?
>
> Oh, I checked out that National LM1949 driver someone mentioned
> recently.  Looks like a winner.  Another fun chip is the Linear Tech
> LTC1294.  This is a 12-bit 8-channel (4 channels differential) A to D
> converter which operates across a 3-wire interface...  You could (and I
> do) read all sorts of MAPs, TPS, air/coolant sensors etc with just one
> of those guys...
>
> >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?
>
> Wouldn't there be a phasing problem between the rotor and the
> appropriate distrib post if it is set for 45 degrees?
>
> Thanks for a great list!
> -Bill the arcstarter
> Starting arcs in Cinci, OH
> http://www.geocities.com/CapeCanaveral/Hangar/6160
>
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