We have been investigating the concept of running a spark ignited internal combustion engine on hydrogen (H2), oxygen (O2), and argon (Ar). Basic engine theory predicts such an engine will see a considerable improvement in engine efficiency (theoretically ≈75%, and in practice ≈50% including heat transfer and friction losses) over standard engines. These gains in thermal efficiency are due to argon's high specific heat ratio (γ= 1.67 compared toγ < 1.4 for air). Experimentally achieving such high efficiencies, however, has been difficult due to engine knock, which occurs at compression ratios as low as 4.5. The engine's spark timing must typically be retarded due to knock. This limitation reduces the maximum efficiency of the engine. In this paper, dual spark ignition is studied to delay the onset of knock in this novel hydrogen engine concept. In an effort to obtain the highest efficiency of this concept, experiments were conducted using a single cylinder CFR engine. Argon concentrations of 84%, 86%, and 88%, by volume, were studied using single and duel spark ignition at stoichiometric fuel-oxygen mixtures with compression ratios between 4.5 and 7.