An ignition system for producing high voltage pulses to initiate arcs across spark plug gaps of an internal combustion engine comprising:
- a reluctor having as many arms as there are cylinders in the associated engine and driven thereby,
- a pickup coil wound on a magnetic core mounted adjacent said reluctor for producing a sequence of alternating voltage pulses, one pulse with the rotation of each reluctor arm past the end of said core,
- a pulse modifying circuit for shaping and displacing the alternating voltage received from said pickup coil and producing a positive voltage that reaches a threshold level, said threshold level occurring linearly earlier, with increased engine speed, as each reluctor arm approaches said pickup coil core,
- a run amplifier connected to receive the output from said pulse modifying circuit and initiating a first pulse at the instant said voltage threshold level from said pulse modifying circuit is reached, the instant of initiation of said first pulse occurring at a linearly increasing angle prior to lineup of a reluctor arm with the end of said core as a function of increased reluctor rotative speed,
- a timer connected to receive said first pulse from the run amplifier initiating simultaneously a second pulse upon initiation of said first pulse by said run amplifier,
- said timer output being terminated after an exact constant timed interval,
- said timed interval being equal to the time required for said reluctor arm to traverse said linearly increasing angle as the rotative speed increases so that the termination of the exact constant timed interval always occurs at the same position of a reluctor arm prior to its lining up with the end of said core at all engine speeds,
- a switching means connected to said timer for actuation thereof during the duration of said constant timed interval,
- an ignition coil comprising a magnetic core having a primary and secondary winding wound thereon,
- said primary winding comprising a few turns of flat strip conductive material and said secondary winding comprising a multiple of layers with each layer having a multiple of turns with the beginning turn of each layer always starting from the same end of the layer that the preceding layer started from and the ending turn of each layer being returned between layers with a few large spiral turns to the beginning of the preceding layer, and
- the high voltage output end of said secondary winding being connected in series with a diode which prevents current flow through the secondary winding when current is flowing in the primary winding,
- said switching means being connected in series with said primary winding across a source of voltage thereby initiating current flow through said primary winding at the instant the output of the pulse modifying circuit reaches the said threshold level and terminating said current flow at the same position of a reluctor arm prior to its lineup with said core at all engine speeds,
- said current flow through said primary winding being continuous during said constant timed interval and resulting in an averaged current magnitude having zero value at zero RPM then increasing linearly with increased speed.