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Drew Dowdell

Mercedez Benz News Mercedes-AMG Debuts Most Powerful Production 4-cylinder

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18 minutes ago, dwightlooi said:

I'll favor an approach using GREATER DISPLACEMENT and LOWER BOOST. As I have said before in previous threads, the GM 2.7T four potter is an ideal candidate. Keeping the same boost 1.4 bar (20.6 psi) in a properly sized turbo (Eg. G25-550) and a generous air-to-water intercooler -- instead of the undersized and almost falling off the map conch shell they have on it -- will produce about 420 lb-ft (up from 348 lb-ft). This engine won't be a revver with it's 102mm stroke. But, it doesn't have to be; 6,100~6,200 rpm is plenty when you have 420 lb-ft from 2,200~5,200 rpm and 420 hp @ ~5,300 rpm. Hitting the torque peak at 2,200 rpm, however, makes the car a lot easier and enjoyable to drive.

Totally agree, would take a bigger motor, less boost over smaller, high boost high reving.

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4 hours ago, dfelt said:

Totally agree, would take a bigger motor, less boost over smaller, high boost high reving.

I think GM should have two "Grades" of motors -- Standard and Premium.

Chevy and GMC uses the Standard Grade optimized for value and economy. Caddies and Buicks should only use the Premium Grade, optimized for performance and refinement.

The engines can be built on the same production line and share most parts. But the Premium Grade will have things you can never justify to the bean counters for a Malibu or a Silverado. Things like:-

  • Individual Throttle butterflies for a snappier response
  • Dual Injection with port injection for a quieter idle and cleaner intake valves
  • Titanium intake and Sodium filled exhaust valves
  • Titanium Aluminide turbine wheels and ball bearing cartridges for marginally better the turbo response and durability
  • Air-to-water intercoolers for greater efficiency and lower pressurized volume (better response)
  • Forged Steel or Titanium-Aluminide rods and crankshaft.
  • Additional acoustic jacket and coverings for a quieter power train
  • Magnetorologic Engine and Transmission mounts for better isolation without compromising torque capacity.

 

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4 hours ago, dfelt said:

Totally agree, would take a bigger motor, less boost over smaller, high boost high reving.

A bigger motor may not fit in a small car though so this is what you get.  You can't fit a V8 in an XT4 or a Chevy Sonic.

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12 minutes ago, smk4565 said:

A bigger motor may not fit in a small car though so this is what you get.  You can't fit a V8 in an XT4 or a Chevy Sonic.

The 2.7T fits where the 2.5 fitted. It'll fit just fine.

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4 hours ago, smk4565 said:

A bigger motor may not fit in a small car though so this is what you get.  You can't fit a V8 in an XT4 or a Chevy Sonic.

People thought a small block V8 would not fit in a Chevrolet Luv Truck and yet plenty of people swapped out the 4 banger for a V8.

 

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18 hours ago, dfelt said:

People thought a small block V8 would not fit in a Chevrolet Luv Truck and yet plenty of people swapped out the 4 banger for a V8.

 

Well, plenty of people believe in NONSENSE and that is not limited to automotive matters. As a general rule, a V8 will fit where an I4 will fit in a longitudinal engine bay. This is particularly so given the very compact -- very short and narrow -- nature of a push-rod V8.

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