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which has an 18° offset crankshaft resulting in an uneven firing interval. Later, the Honda C engine used 30° offset crank pins, resulting in an even firing interval. A newer example, the Alfa Romeo 690T engine, uses three crankpins 120 degrees apart, and has an uneven firing interval with a harmonic order of 1.5. As per V6 engines with 60° V angles, these engines have primary reciprocating plane and rotating plane imbalances,

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