Lucas TAC Ignition System NOS Very Rare
Extremely rare original new old stock Lucas T.A.C. Ignition, Transistor Assisted Contacts
The initials T.A.C. stand for Transistor-Assisted Contacts, and the system is designed to reduce the work done by the distributor contacts to a level giving maximum contact life and improvements in engine performance. A special high-voltage transistor has been developed by Lucas to meet the requirements of automobile ignition systems, and in the T.A.C. system the transistor makes and breaks the coil primary circuit. This means that the contacts carry only a small current and, consequently wear is substantially reduced—it is claimed that after bedding-in of the fiber heel, no contact adjustment will be needed for 25,000 miles.
Due to the absence of arcing at the contacts, performance at low engine speeds is improved and starting is easier particularly in low ambient temperatures. Because the transistor can handle a higher ignition coil primary current than contacts in a conventional system, a coil having a reduced primary inductance is employed. The system retains all the components of a conventional coil-and-distributor arrangement and includes, also, a “transistor ignition unit” and a ballast resistance. The contact breaker capacitor is unnecessary.
All positive ground British cars prior to 1968, including but not limited to Austin Healey 100-4, 100-6, 3000, Sprite, MGA, MGB, MGC, Midget, Triumph TR2, TR3, TR4, TR6, etc.
Part Number: Factory – 54041044