Re: [VintageLambo] 400GT Ignition

Hi Gary, Thanks for the final clarification. I was assuming firing order but didn"t specify. Aaron had a problem with no fire on cylinders 4, 5, and 6, so as he pointed out, the "B" set was messed up. I think we"re all saying the same thing, but your explanation is the most clear. Thanks again, Jack Gary wrote: Let"s settle this once and for all. The distributors points set up is designed to fire every other cylinder. As an example, the firing order on front engined V-12 Lambo"s is 1,5,3,6,2,4, for the right hand distributor.Let"s refer to the two sets of points as A and B. As the distributor turns , and starts from cyl # 1 position, here"s what happens: 1. points set A fires cyl #1 2. points set B fires cyl # 5 ( next in the above mentioned firing order) 3. points set A fires cyl # 3" 4. points set B fires cyl # 6" 5. points set A fires cyl # 2" 6. points set B fires cyl # 4" now, a full revolution of the distributor has happened, and the above process starts all over. Gary Bobileff, of Bobileff Motorcar Co. in San Diego ----- Original Message ----- From: Jack Riddell To: VintageLambo@yahoogroups.com Sent: Wednesday, February 12, 2003 8:03 PM Subject: [VintageLambo] 400GT Ignition I had always thought the two sets of points in the 400"s Marelli distributor were designed for overlap and extended dwell. Since I switched over to a single distributor years ago, I forgot about it. But Aaron got me wondering, so I broke out one of my spare Marellis and hooked up the ohmmeter (see attached).I rotated the shaft and watched the needle on the meter go open and closed and checked the corresponding point on the cap to see what cylinder was served in each case. Turns out Aaron is correct, each set of points handles three cylinders and there is no overlap for increasing dwell. And if you have a dirty or open set of points, you will see degraded performance in the three cylinders served by that set. So I learned something new (after all these years). Gotta love this list. Jack _____