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A study on the effect of induction manifold angles in tumble induced turbulence on detonation and pre-ignition in spark-ignition engines was conducted on a Ricardo E6 variable compression engine. A new cylinder head was designed and manufactured with four induction manifold inserts with angles of 30°, 40°, 50° and 60° in addition to the original angle of 90°. The onset of pre-ignition and detonation were defined by a piezo-electric pressure transducer. Knock was characterized by the “knock-limited compression ratio” concept. However pre-ignition was characterized by the input electrical power consumed by a pre-igniter acting as an artificial hot spot. A set of experiments were carried out on each induction manifold to cover the effect of the design and operating parameters of the engine on detonation and pre-ignition.