[VintageLambo] Re: 400GT ignition problem found

Ok folks, I went out to the garage and took the cap off one of my Marellis and watched everything spin around as I hand cranked the motor. My conclusion is that my 400gt does have true dual-point distributors.ie: the second set of points is not like the "mallory" dual-point distributors which simply adjust (lengthen) the dwell to improve spark (is that right?). With the Marelli the second set opens right when the first set closes, and vise-versa -- there is no overlapping.Three lobes, so one full rotation of the distributor (and cam) equals each set of points opening/closing 3 times, equals 6 explosions, equals 2 turns of the crank (4 piston strokes). That is why Aaron"s 4,5,6 plugs weren"t firing, one set of points was fried.The firing order is 1-7-5-11-3-9-6-12-2-8-4-10.If you start with 4 and take every 4th number, you get 4, 5, 6. I think that"s what was going on, and if I"m wrong, I"ll eat my distributor cap.;^D Best to all, Fred PS: Also, the "mallory" distributors are most likely not meant for 8krpm motors like ours.I"m guessing we have dual-points to prevent point-bounce at high rpm.