Ignition with MegaSquirt and a dizzy

[MrBill]

Okay, the thread kinda "fizzled out" in maintence, primarily because I didn't underststand what I was saying. I've read up on the MsnS and have a couple of questions:

I have an 82 242 with a b21ft. Since it had CIS (its MIA) I think it has a mechanically advancing distributor. This is not what I want, I want a "locked one"
I have an 86 240 wagon with a b230f in it. Its bone stock, and no longer runs due to me f00baring the ECU. It is rusty and such and is now a parts car.

That ecu I assume is LH 2.2, which is a locked distributor? I am not near it so I cant look, but I need to plan out what I need to do to the 242 to get her running. Does the dizzy just swap over? And if it does, should there be the 3 pins w/wires and such running from it? One being signal, and the other 2 being power/ground? With what I have stated, I can advance/retard my timing and such?

Also, how accurate is it? Im sure EDIS is MORE accurate, but how good is this method?

[18yr240t]

You want the dizzy out of the 86. 2.2. Just put the engine at #1, the rotor will rotate when you pull it out and put it in so make sure the rotor ends up pointing at the mark in the dizzy housing. The 86 is a three wire t - and signal. You also need a module prefferebly a bosch 139.

[MrBill]

You want the dizzy out of the 86. 2.2. Just put the engine at #1, the rotor will rotate when you pull it out and put it in so make sure the rotor ends up pointing at the mark in the dizzy housing. The 86 is a three wire t - and signal. You also need a module prefferebly a bosch 139.

My car still sparked when I killed it, so I assume I still have A module, any idea if it is a 139, or did they come on another vehicle?
And so the signal is going to hook up to the bosch, which then sends a signal to MS? Then MS fires the coil, or does the bosch have a 2 way communication? All the bosch is doing is interpreting the signal, yes?
So it goes: Hall sensor to bosch, bosch to MS. MS reads, and fires coil at correct time?

[18yr240t]

The signal from the dizzy goes to ms, the pwr comes from switched 12v with a 10 ohm resistor. One wire from the module goes to ms, the other wires you use go to the coil. I used the coil that was in the car I took the dizzy from. I think the 139 module is from a saab.

[MrBill]

The signal from the dizzy goes to ms, the pwr comes from switched 12v with a 10 ohm resistor. One wire from the module goes to ms, the other wires you use go to the coil. I used the coil that was in the car I took the dizzy from. I think the 139 module is from a saab.

So what controls the advance/retard if MS sends no signals? 12v is switched on with the car I assume, so how do I advance/retard the timing?

Edit: If I understand, each contact point on the dizzy has like 30+ degrees of possible time to fire, and its up to the coil to fire when it needs to, right? So, how do I tell the bosch when to fire her?

[18yr240t]

ms triggers the module..

[Lord_Athlon]

the sensor in the distro tells ms where the crank is at. Ms takes the signal from the distro, and fires the coil depending on the map.

[MrBill]

the sensor in the distro tells ms where the crank is at. Ms takes the signal from the distro, and fires the coil depending on the map.

Oh, so the wire from the bosch to the MS is the MS telling the Bosch what to do. Bosch fires coil at MS's command.
Yeah?

[swedefiend]

Distributor >> MSnS (on tach in wire) >> Ignition module (139, MSD, whatever) >> Distributor cap (ignition primary) >> Plugs (ignition secondary)

[MrBill]

Distributor >> MSnS (on tach in wire) >> Ignition module (139, MSD, whatever) >> Distributor cap (ignition primary) >> Plugs (ignition secondary)

oh snap, the 139~like a msd 6AL?

Electronically conrolled ignition is finally making sense!
Thanks everyone, I always thought megasquirt was "magical" but now I understand.