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An igniter system for a reciprocating piston internal combustion engine having one or more cylinders including at least one igniter per cylinder is disclosed. The igniter system can comprise: a combustion chamber connected to a main cylinder of the engine by a restricted diameter bore, wherein a lea

An igniter system for a reciprocating piston internal combustion engine having one or more cylinders including at least one igniter per cylinder is disclosed. The igniter system can comprise: a combustion chamber connected to a main cylinder of the engine by a restricted diameter bore, wherein a lean burn fuel mixture is introduced into the combustion chamber by the normal compression stroke of the engine; a hydrogen valve that injects a hydrogen rich gas into the combustion chamber forming a mixture of hydrogen and air having a hydrogen concentration above the stoichiometric ratio for hydrogen and air in the combustion chamber; and a spark ignition source that injects hot unburned hydrogen into the main cylinder, thereby initiating ignition.

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1. An igniter system for a reciprocating piston internal combustion engine having one or more cylinders including at least one igniter per cylinder, the igniter system comprising: a combustion chamber connected to a main cylinder of the engine by an igniter tube having a restricted diameter bore, wh

1. An igniter system for a reciprocating piston internal combustion engine having one or more cylinders including at least one igniter per cylinder, the igniter system comprising: a combustion chamber connected to a main cylinder of the engine by an igniter tube having a restricted diameter bore, wherein a lean burn fuel mixture is introduced into the combustion chamber by the normal compression stroke of the engine;a hydrogen valve that injects a hydrogen rich gas at high pressure near top dead center into the combustion chamber forming a mixture of hydrogen and air having a hydrogen concentration above the stoichiometric ratio for hydrogen and air in the combustion chamber; anda spark ignition source that injects hot burning hydrogen into the main cylinder, wherein hot unburned hydrogen is delivered into the main cylinder as a result of the injection and combustion of said hydrogen rich gas,wherein an internal bore of the combustion chamber and the restricted diameter bore of the igniter tube are configured such that a detonation event in the combustion chamber results in hydrogen injection into the main cylinder at supersonic velocities relative to a local speed of sound in the main cylinder. 2. The igniter system of claim 1, wherein the hydrogen valve injects the hydrogen rich gas into the combustion chamber before Top Dead Center. 3. The igniter system of claim 1, wherein the spark ignition source fires the mixture either before, on or after Top Dead Center. 4. The igniter system of claim 1, wherein a resulting combustion event expels an excess of hot, burning hydrogen into the main cylinder, thereby initiating cylinder ignition. 5. The igniter system of claim 1, wherein the restricted diameter bore includes a reduced diameter relative to an effective diameter of an internal bore of the combustion chamber. 6. The igniter system of claim 1, wherein the restricted diameter bore includes a dual taper. 7. The igniter system of claim 1, wherein the hydrogen valve is closed during firing of the spark ignition source. 8. An igniter system for a reciprocating piston internal combustion engine having one or more cylinders including at least one igniter per cylinder, the igniter system comprising: an igniter tube having a restricted diameter bore;a combustion chamber connected to a main cylinder of the engine by the igniter tube, wherein air is introduced into the combustion chamber by a normal compression stroke of the engine;a hydrogen valve that injects a hydrogen rich gas at high pressure into the combustion chamber forming a mixture of hydrogen and air; anda spark ignition source that fires the mixture either before, on or after Top Dead Center,wherein an internal bore of the combustion chamber and the restricted diameter bore of the igniter tube are configured such that a detonation event in the combustion chamber results in hydrogen injection into the main cylinder at supersonic velocities relative to a local speed of sound in the main cylinder. 9. The igniter system of claim 8, wherein the igniter tube includes a reduced diameter bore relative to an effective diameter of the combustion chamber. 10. The igniter system of claim 8, wherein a lean burn fuel mixture is also introduced into the combustion chamber by the normal compression stroke of the engine. 11. The igniter system of claim 9, wherein the hydrogen valve injects the hydrogen rich gas into the combustion chamber before Top Dead Center. 12. The igniter system of claim 10, wherein a hydrogen/air ratio in the combustion chamber is above a stoichiometric hydrogen/air ratio for local conditions of pressure and temperature. 13. The igniter system of claim 8, wherein the spark ignition source fires the mixture either before, on or after Top Dead Center. 14. The igniter system of claim 12, wherein a resulting combustion event expels an excess of hot, burning hydrogen into the main cylinder, thereby initiating cylinder ignition. 15. The igniter system of claim 8, wherein the restricted diameter bore includes a reduced diameter relative to an effective diameter of an internal bore of the combustion chamber. 16. The igniter system of claim 8, wherein the restricted diameter bore includes a dual taper. 17. The igniter of claim 8, wherein the hydrogen valve is closed during firing of the spark ignition source.