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Discussion Starter #1 (Edited)
The engineering that AMG has put into the new 416 hp 2.0L 4 cylinder turbo (M139) engine is very impressive. They've really raised the bar for other manufacturers. The specific output (HP/L) is something that I would have expected from a Honda 4 cylinder (if they still manufactured engines like they did in the '90s/early 2000s). It'll be interesting to see how far the aftermarket can push this engine, especially with E85.

  • Turbocharged 2.0L inline 4 - handbuilt at AMG
  • 416 hp @ 6750 rpm, 369 lb-ft @ 5000 RPM
  • Redline: 7200 rpm
  • Peak Boost: 30.5 psi
  • Displacement: 1991cc (83.0mm bore x 92.0mm stroke)
  • Compression: 9.0:1
  • Specific output: 208.9 HP/L
  • Engine weight: only 353.8 lbs
  • Twin scroll, roller bearing turbocharger w/ electronic wastegate actuator
  • Forged crankshaft, rods & pistons
  • Aluminum closed deck block
  • Nanoslide cylinder coating
  • Larger & baffled oil sump
  • DOHC 16 valve aluminum cylinder head
  • Adjustable intake and exhaust camshafts w/ roller cam followers
  • Camtronic valve timing on the exhaust side (2 camshaft profiles)
  • Larger, hollow-bored, sodium-filled exhaust valves
  • Dual injection - Direct & Port Injection
  • Electric water pump w/ 2 radiators
  • Air/water intercooler w/ additional cooling from the A/C
  • 8 speed dual-clutch auto
  • "Advanced" 4MATIC AWD system with a "Drift" mode
  • 0-60 < 3.8 sec, 1/4 mile < 12.3 sec depending on the "45" chassis
A few articles w/ pictures for those interested:
Mercedes Press Release - The world's most powerful four-cylinder engine in production
MotorTrend - AMG Has a 416-HP Four-Cylinder. Here’s What You Need to Know
Car and Driver - 416-HP Mercedes-AMG Four-Cylinder Engine – Full Specs, Details
Road & Track - How Mercedes-AMG Made the Most Powerful Production Four-Cylinder Ever
How Mercedes-AMG made the most powerful turbo four-cylinder engine in the world

A video of the "One Man, One Engine" assembly cart:
https://www.youtube.com/watch?v=MdMQ4OjbYng

While not really in the same class as the STI, the AMG GLA 45 will be comparable in price to the S209 ($60-65k). Too bad it doesn't come with a manual transmission.
 
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