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Gary
It is not an optical trigger like pertronics etc. The whole idea behind the 123 Ignitions was to create an advance management system that did away with all the springs and weights, while delivering the accuracy of electronic management to older classic cars. It has a feature called Spark balancing as used in Indy Car Racing that phases each pass of the rotor to fire exactly when it should as it passes the posts in the cap. A magnetic pick up drives the electronic pc board for superior timing w/o all the springs and weights that normally either fatigue or wear out in time. Pertronics still relies on the centrifugal advance mechanism as well as many others. This does not. All advance is managed electronically. The best thing is their lasted product that came out June last year. Fully programmable distributor by you the end user. Capable of storing two curves in the distributor that can be changed on the fly. Some plot a curve for power and one for economy. It is absolutely top of the line. Billet construction, Readily available caps and rotors from local parts houses. Smoothes out the running of any old classic.
Hope this helps Ed 123ignitionusa.com
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Regards Ed Supplier of 123 Ignitions for all sorts of Classic Autos from Volvo to MG and anywhere in between. The latest in ignition management.
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