At what point does a hot hatch become a pint-sized sports car? The Mercedes A45 AMG was already blurring the line, but the engineers over at AMG's Affalterbach headquarters decided that the pint-sized turbo terrier needed more power. Thanks to an extra 15 kW (20 hp) from its 2.0-liter motor, the updated A45 AMG will now hit 100 km/h (62 mph) in just 4.2 seconds.
Finnish engine manufacturer Wärtsilä must be a fascinating place to visit. The company manufactures some of the most mind-bendingly enormous marine diesel engines in the world, like the record-breaking, 89-foot high, 44-foot long, 110,000 horsepower RTA96-C we wrote about more than 10 years ago. Now, Wärtsilä has another entry in the Guinness Book of Records ... for the world's most efficient 4-stroke diesel engine.