Holley/Duraspark Distributor conversion Part Due(2)

[Bill usn-1]

OK I had 1 last Holley distributor and decided to do a little different conversion.
The basics are all the same so the text will be brief.

[Bill usn-1]

[Bill usn-1]

[Bill usn-1]

Already bench tested!!!
Proved that the EST only needs 12v and a ground to produce spark. No computer connection needed!!!
This means you can actually peform the distr conversion, install it in the motor and still run your carb while you complete the rest.
It won't be perfect but it will run.
To do it, you will need to set the base timing to about 10°. then at 2000rpm the EST will add 20 more.(no timing curve) This won't be good under a load but cruising under light loads will work. If it pings back off the base timing.





Note: When setting the timing for the first time you must ensure the wiring is correct on the ignition module. The 2 wires from the pickup in the distr must be connected to the proper terminal, P and N on the module. To verify they are correct:
A. Set engine to TDC compression stroke. For IH use #8 for V8s and #1 for 4 cyls. For all other makes use the correct plug.
B. Remove the cap and verify the rotor phasing is correct IAW the distr conversion thread. Rotor should be just past center of the cap terminal in the direction of rotation(clockwise for IH) and the reluctor should be lined up.
C. Connect timing light and disconnect the timing bypass connector.
D. Crank engine to check timing. If the wires are connected properly then the timing will be within 5* of 0*. Just set timing to 0 and your good. If the timing is 20-30* away then swap the P and N wires and check again.

[EagleMark]

Nice work Bill, very clean installation of external EST.

[Bill usn-1]

Thanks,
Here it is all cleaned up and ready for install.

[Bill usn-1]

Now what about the guys that aren't fuel inj yet but want a distr like the $400 HEI?

Well how about this?
Add the same epoxy core coil and you have all the same parts for a lot less money.

[thehud]

Just curious as to what wire went to what post on the EST.

The Duraspark pick-up has 3 wires:

RED = top of pick-up

PURPLE = bottom of pick-up

BLACK / GREEN = ground

I will assume that the ground wire is pulled out and is mounted with the machine screw through the hole of the EST.

Now is the Red wire hooked to P or N of the the EST?

Thanks

[Bill usn-1]

Take a look at the ignition FAQ. All the different wiring diagrams are posted there.

purple to P
orange to N
Blk to ground

[Bill usn-1]

Originally Posted by Bill usn-1

Thanks,
Here it is all cleaned up and ready for install.

UPDATE:

After installing the distr in the dual fuel 304, I found you get more room to set the timing if you turn the module the other direction!!

Put the connectors up.