which controls the timing of the ignition system the circuit is characterized by an electro optical coupling device such as a photosensitive transistor controlled by a light emitting diode to provide a variable light output in response to a variable output signal from the computer analyzing the operation of the engine application_number US 34103082 A description fig1 is a block diagram of the ignition system shown in fig2 fig2 is a schematic diagram of an ignition system embodying the principles of this invention referring now to the drawings fig1 illustrates a block diagram of an ignition system that includes an energy storage section 10 a spark plug 11 for receiving the stored energy and for igniting fuel in an internal combustion engine 40 a trigger circuit 50 for generating trigger pulses and suppling them to the energy storage section 10 to release electrical energy to the spark plug 11 in timed relation to the operating cycle of the engine 40 and a timing circuit 100 for advancing the time that the trigger circuit releases the electrical energy from the storage 10 to the spark plug 11 where there is more than one spark plug the energy storage section 10 includes a distributor to distribute the energy released to each spark plug in the proper sequence in the operating cycle of the engine 40 fig2 illustrates an ignition system constructed according to the invention for supplying timed spark discharges from spark plug 11 to an internal combustion engine 40 any number of spark plugs 11 may be used and electrical energy may be distributed to the spark plugs in timed relation to the engine through.