single or dual distributors

No difference in points bounce single to dual dist. Each distributor in a US spec car has one set of points per bank for idle and another off idle and up. The euro has one set of points per bank period. The second set on the US car is for idle to set base timing retarded through a micro switch on the carb for smog reasons. So, same with either setup regarding the points bouncing its just you set the base timing for one distributor, have half as many points to deal with and the timing for both banks as well as the mechanical advance is identical since its only one distributor for the engine.

 

right on a domestic muscle car, wrong on a 308 since the distributor doesnt use both points to increase dwell, it uses one or the other depending on throttle position.

 

Best of both worlds:

-For the look, keep the twin dizzys, then...

-Step into the 21st century, ditch the points, run electronic (either hall-effect or InfraRed) triggers installed in only one of the dizzys.

You got one advance mechanism working for both banks. Always sync'd. Old-school look intact (hell, I still have the condensors sitting on the dizzy bodies!). Solid-state reliability. All mods can be reversed back to original.

I fab'd a special bracket to mount two Crane Cams XR700 sensors and are neatly installed in the forward bank dizzy.
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Pete,
We'nt you thinking about making more of those? (Is that a hint?)
Tom

 

I'm with Birdman, and I say none, but keep the originals in a box.

My car has two and an upper RPM ignition problem. Instead of rebuilding the dizzy's, I'm going electromotive.

 

hey, where do you guys get the single dizzy cap? rotor?

is there another car to x reference it from? i have a friend here with a euro dry sump 76 that may need a cap, and the single cap is a bazillion dollars from the usual places.

 

Oh Pulleeeeeeease!!

 

I got tired of the rubbing blocks wearing and the timing drifting, so went with Norwoods single distributor conversion.

Ship both distributors to them, they take the best parts to make one good unit, recurve the advance, slightly reconfigure the cap mount to take a $16.00 chevrolet cap.

The points get tossed, along with the stock rotor and a chrysler magnetic pick up gets installed along with a modified ford rotor.

The magnetic pick up works well with MSD-6AL unit, which has an adjustable soft rev limit chip.

They ship your tach out for recalibration to 8 cylinder firing, (not the stock 4).

Cost: about $1300.

Looks like a single distributor set up.

Parts are available at any auto parts store across the us of a for about $100.

It is not the ultra tech super whammo set up like electramotive but it works well.

best,
chris

Old parts go in the box, in case the next owner wants to go retro .

 

Doesn't the Ferrari use both R1 and R2 points as a "dual point" at idle? I don't see where the R1's are taken out of the circuit, the R2 are added in.