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Reply to "Twin plug"

It does look quite a bit different from any that I've seen, too.

All the Spyder engines I've seen in the Northeast (even at Al Alden's shop in the 60's) looked like this, with a disti on each cam mount.  That's what made them so cool to me.  This is what the Spyder Factory is running, too, AFAIK.  these guys suffered from spark bounce all over the place caused by wear in the cam drive gears - That's why the Spyder Factory went to hidden crank fire ignition and just use the distis to move the sparks to the right cylinder.

I saw one at Paul Russell's shop that had the type of disti setup below, but it wasn't installed in a car so I don't know if it went into a Spyder or Carerra.  I think this is more like what Ed's seen in the past:

And apparently there is yet another drive style, but if both distis are driven off of the same drive point I don't suppose it matters a lot whether they're 30º, 90º or 120º apart, other than clearance to other engine components.  Once they're timed they stay put (except for spark bounce from wear in the drives).

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