Next it was time to work on ignition delivery. I am using EFI with integrated ignition control. But I don't like the look of COP, coil packs or other spark delivery methods on a vintage car. It should be a 12 plug distributor for twin plug. I only use the body, rotor and cap since the ECU controls everything. But I took out the least reliable parts. Caps and rotors tend to last a while. So.. Here is the process to build my twin plug distributor.
First I strip the distributor down. This donor had bad bearings so I pulled the gear and shaft out as well.
The body is turned on a lathe to make the top concentric and reduce the diameter for my adapter cap. You can see the cut lines. The distributor bodies are not round. They are oval at the casting parting line. The top sections are not machined and don't have to be - unless you are adding a part on top.
the machined body is then placed in the freezer while the twin plug adapter cap goes in the oven at 200F. 15 min later they are mated. A few soft blows with a dead blow hammer and the body drops into the adapter cap. The result is a twin plug distributor body.
Next, It was time for new bushings. I bought these from a supplier in AZ (PK) since Pelican does not carry them. Again, Heat the distributor body, freeze the bushing and then press in. I used a 12" C clamp to press them in. They did not fit in the vise and my press didn't want to hit the inner bushing.
Lower bushing pressed in.
Once the bushings are pressed in you have to ream them to 12.5mm. I used a long drill bit to also make sure they were parallel and that the shaft spins freely.
If you have 12 spark plugs and 2 ignitions you need two coils as well. So, I wanted an adapter plate to mount them on the top of the fan. I just like the look. A section of flat stock was drilled with mounting holes and cut to length. Then it was painted black. This will all make sense in another post.
I bought two cheap coil brackets that were silver zinc in color. These were trimmed at the mounting holes and then I converted the clear to yellow zinc.
The two coils will mount side by side on top of the fan. The brackets were trimmed to get them to mount closer and reduce clearance. Have to keep it tidy.
Lastly, I Have to prep the twin plug rotor. I make an adapter pin that offsets the rotor to match the height of the cap adapter. I used to use a mounting screw but had issues with high rpms and the screws not being secure enough. Now I epoxy them into place.
I will show the completed assembly soon in another post.