Mercedes A-Class Sedan USA Forum - View Single Post - 382 HP In A45 or 415 HP In A45 S?
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post #1 of (permalink) Old 06-06-2019, 05:25 PM Thread Starter
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382 HP In A45 or 415 HP In A45 S?

A45 numbers are out and there's enough of a divide to give them serious thought, which will it be?

Mercedes-AMG introduced the CLA 35 Shooting Brake yesterday, but now we can confirm performance specifications for the highly anticipated A45 and its siblings.

Set to be powered by an all-new turbocharged 2.0-liter four-cylinder engine, known as the M 139, the high-performance hatchback will have a base output of 382 hp (285 kW / 387 PS) and 354 lb-ft (480 Nm) of torque. There will also be an S variant which has 415 hp (310 kW / 421 PS) and 369 lb-ft (500 Nm) of torque.

Those are some truly impressive numbers for a four-cylinder engine and they mean the mill develops up to 208 hp (155 kW / 211 PS) per liter. That’s even more powerful than the A 200 which has a turbocharged 1.4-liter engine developing 161 hp (120 kW / 163 PS).

Besides the mind blogging performance specs, the engine revs up to 7200 rpm and has a torque curve which is said to deliver power in a fashion similar to a naturally aspirated engine.

Compared to the turbocharged 2.0-liter four-cylinder in the A35, the new engine is rotated 180 degrees and this allows the turbo and exhaust manifold to be positioned at the rear. This might not sound too important, but it enables the engine to be equipped with a front-mounted intake and improved ducting.

Besides that switch, the engine has a new twin-scroll turbocharger that features a turbine housing with two different flow passages that run parallel to one another. This, along with divided ducts in the exhaust manifold, helps to prevent individual cylinders from negatively influencing one another during load cycles.

Speaking of the turbo, it also adopts roller bearings for the first time. This helps to reduce friction and improve responsiveness.

Also Read: 2020 Mercedes-AMG A45 Tackles The Nürburgring Virtually Undisguised

As for the engine itself, it has an all-aluminum crankcase, a forged steel crankshaft and forged aluminum pistons which reside in Nanoslide-coated cylinder liners. Other highlights include a new two-stage fuel injection system as well as repositioned injector nozzles and spark plugs that allow for larger exhaust valves.

Given the engine’s high-performance, cooling was an important consideration. To cope with the issue, the A45 will have an electric water pump that operates independently of the engine. The car will also be equipped with an additional radiator that supports the main radiator up front.
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