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To explain this in simple terms, when the spark plug fires, it burns the gas/air mixture. This causes an explosion. The explosion forces the piston down. This forcing the piston down causes the crankshaft, which the piston is connected to, to turn. The turning of the crankshaft creates a turning force. This force or energy is sent to the transmission by way of the torque converter. This torque converter takes this turning power and turns into energy the tranmission can use. In turn the tranmission does its job and it turns the axis. This is what causes the wheels to turn.

So the torque itself is created by the downward force of the pistons.

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Q: What applies torque in an automobile engine?
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