Energon convertor

An energon convertor is an aspect of Transformer anatomy that is comparable to a human heart.

Fiction

Generation 1 cartoon

After destroying the robotic insecticide, which was the only way of destroying the Insecticon Army, Megatron cynically said that the act broke his energon convertor which caused Starscream and Soundwave to laugh. Quest for Survival

IDW comics continuity

When an Arachnosaur attacked Wheelie on LV-117, it bit into his energon convertor. The creature was shocked by a jolt of energon and ran off, while Wheelie was forced to repair his convertor. Spotlight: Wheelie