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GM provides technical details of the Gen 2 Voltec propulsion system used in the 2016 Volt

Green Car Congress

liter four-cylinder, naturally-aspirated direct-injection spark-ignition engine with sufficient power to continue normal driving after most of the battery energy has been depleted by EV driving or during conditions when available battery power is low because of extreme temperatures. Clutches are OWC1, C1 and B1.

Volt 150