1. Autos
Send to a Friend via Email

Your suggestion is on its way!

An email with a link to:


was emailed to:

Thanks for sharing About.com with others!

An Internal combustion engine and a motor/alternator


2007 Saturn Aura Green Line engine bay

On the left is the efficient ECOTEC engine. Right is the power inverter for electric power control. This system employs a high-tension belt driven starter/alternator to start the engine and give mild assist. GM calls it BAS (Belt Alternator Starter).

photo © Adrian Gable

©2014 About.com. All rights reserved.