Dual Sync Distributors

I am preparing for a new build (V8 Ford FE with injection) and contemplating the use of a dual sync distributor. I understand how the cam signal works on a Hall Effect style unit, but curious how they get the crank signal. I know it is another Hall Effect sensor, but is the crank signal then done electronically, by mechanical means to get the multiplier effect, by VooDoo, maybe a little guy in the bottom of the distributor pushing a button?

My friend Google and his friend Siri can't come with a clear description on how it works, just a bunch of ads to buy one and a few more sites of how to install it - always with their proprietary brand of ECU's.

Can anyone provide a description of how they generate the second signal

Thanks

Paul

I know its not answering your question exactly - But on my Dodge V8 i used an modified MSD billet dizzy as a cam sync and mounted a 60-2 toothed wheel on the damper for the crank signal -Both use VR pickups . All works perfectly through a Link ECU . The dual sync dizzy was hard to get for a Dodge big block at the time .

I have to buy a distributor, the dual sync is about $50 more. To add a tooth wheel and pickup behind the damper would run about $250. For a mild street/track motor, seems like a no-brainer since they are available for the Ford FE

Still hoping someone will chime in on how the work.

Paul

The dual sync distributors have two sets of pickups in the distributor. The outer design has more teeth and is used for crankshaft speed. The inner one has a fewer teeth or a slot to indicate TDC of one of the cylinders. I attached an image I found on Google image search. You can see an inner slot and outer teeth. My 2nd gen (86-91) Rx-7 actually has a dual sync style crank angle sensor with outer teeth to determine crank speed and two inner teeth to determine whether it is the front or rear rotor at TDC.

A trigger wheel by the crank is going to be more accurate but for your needs it's likely not necessary. Distributor is also going to drop in and not require some kind of bracket. Often there are kits available to mount a crank trigger wheel, but if there isn't you've got a whole project on your hands just trying to get that to work right.