Patent ID: 7182077

Claim:
An inductive ignition system for an internal combustion engine operating at a voltage Vc substantially above the standard 12 volt automotive battery with one or more ignition coils T 1 and associated power switches Swi, where i=1, 2, . . . n, with each coil having a primary winding of turns Np and inductance Lp, and a secondary high voltage winding for producing high voltage sparks of turns Ns and inductance Ls, the primary and secondary winding defining a turns ratio Nt equal to Ns/Np, the coils being of moderate inductance with two large air gaps within their magnetic core at the end of the open-E core and containing two biasing magnets at the open end of the open-E core which produce magnetic bias of around 2 Tesla or slightly less, and the coil producing an energy approximately 150 mj and spark of peak current Is of approximately 330 ma, and a secondary winding bobbin with segmented bobbin with 9 to 11 bays and producing a high voltage of 36 kV to 44 kV, the improvement comprising coil structure means which have the following: a) the coil primary turns Np is between 68 and 88 turns making up two layers of flattened round or bifilar wire and having inductance of between 700 uH and 1,100 uH, b) the coils turns ratio Nt is between 50 and 67, c) a special ratio R is between 1.15 and 1.45, and d) a secondary turns of 3500 to 5500.