RE: New AMG 2.0-litre is "most powerful ever

RE: New AMG 2.0-litre is "most powerful ever

Friday 7th June

Latest AMG four-pot is 'most powerful ever'

Incoming A45 will be powered by a brand new 2.0-litre engine, with up to 421hp...



As the drive towards efficiency forces engines to become smaller and smaller, manufacturers are having to find ever more ingenious ways of ensuring their powerplants continue to develop the kind of prodigious outputs to which buyers have become accustomed. The latest example comes from Mercedes-AMG, which has today unveiled the world's most powerful 2.0-litre four-cylinder production engine, set to find its way into the manufacturer's new '45' model line.

The completely new unit, dubbed the M139, produces 387hp in its standard configuration and 421hp in S guise, besting the previously most powerful M133 by 40hp. Maximum torque has also increased by 20lb ft to 370lb ft between 5,000-5,250 rpm. Best of all, Mercedes reckons that the M139's power delivery is comparable to that of a naturally aspirated engine. That's thanks to a dynamically increasing torque curve at lower rpm for improved agility and increased torque at higher rpm, making the engine more free-revving right up to its 7,200rpm redline.


"We already set the benchmark in the segment with the preceding engine. This fundamentally new four-cylinder presented us with the challenge of doing even better. And we succeeded with a number of sometimes revolutionary solutions. With the M139, we have once again impressively demonstrated the engine expertise of Mercedes-AMG. Not only is the output per litre [211hp] unrivalled for a turbocharged engine, the high level of efficiency also demonstrates that the internal combustion engine still has further potential," said Mercedes-AMG Chairman, Tobias Moers.

So how exactly have they done it? For starters the unit has been rotated by 180-degrees, allowing the turbocharger and exhaust manifold to be positioned at the rear, with the intake at the front. This not only makes for the flattest possible profile, benefitting aero, but crucially accommodates improved air ducting "with shorter distances and fewer diversions". A new twin-scroll turbocharger contains roller bearings for the first time, minimising mechanical friction, and also benefits from a divided turbine housing and exhaust manifold, allowing the exhaust flow to be fed to the turbine separately and preventing the individual cylinders from negatively influencing each other.


An electronically-controlled wastegate allows for more precise and flexible control of the charge pressure, which can reach a maximum of 2.1 bar. That's nothing compared to the 160 bar combustion pressures within the new alloy cylinder block, though, it's as sturdy as a diesel's apparently, and sits alongside a new 16-valve cylinder head, all-aluminium crankcase, lightweight forged steel crankshaft and forged aluminium pistons.

The cylinders themselves are lined with Mercedes-AMG's patented Nanoslide coating. Bestowing them with a "mirror-like surface for minimal friction" which is twice as hard as a conventional grey cast-iron liner, it's the same technology found in Merc's Formula 1 engines. Elsewhere there are larger exhaust valves with variable Camtronic valve control and two-stage fuel injection, while an independently operated electric water pump and additional radiator aid cooling.


Finally, a newly designed production line at AMG's Affalterbach factory also sees a return to its "One man, one engine" policy, with each unit entirely hand assembled from start to finish. This provides all the benefits of a bespoke engine build, with employees still "optimally assisted in their work by digital tools". Jolly good.

Quite a lot to take in then, but the end result will hopefully be an A45 which delivers on the promise of a full-fat AMG hatch, after the A35 left us wanting something more. With the car currently in the advanced stages of testing, we shouldn't have long to wait to find out.




Author
Discussion

sidesauce

Original Poster:

925 posts

160 months

Friday 7th June
quotequote all
Regardless of one's view's on 4-bangers, those specs are pretty impressive for a production spec engine. Yes, of course there are 4-cylinder engines in existence with higher outputs but are they designed for daily/long-term use like this one?

Craigybaby69

362 posts

73 months

Friday 7th June
quotequote all
You'd never lose your gloves in that place.....

Schmed

978 posts

14 months

Friday 7th June
quotequote all
The power of four is impressive indeed, and 421 bhp is just insane..

donkmeister

1,604 posts

42 months

Friday 7th June
quotequote all
The fact it's drivable and reliable enough for a warranty is what impresses me the most at that specific power output, in a mass production car!

Darren93

57 posts

47 months

Friday 7th June
quotequote all
That'll be pricey...
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ScoobyChris

718 posts

144 months

Friday 7th June
quotequote all
While I’m a big fan of AMG, doesn’t the Evo FQ-440 trump this?

Chris

Torquey

1,597 posts

170 months

Friday 7th June
quotequote all
I remember 200bhp was risky business for a 2.0 turbo!

However, Mitsubishi were producing 400bhp more than 15 years ago.

Ozone

2,777 posts

129 months

Friday 7th June
quotequote all
Wasn't the Mitsubishi Evo X giving out this sort of power a few years ago?

  • Beaten to it

Master Bean

1,290 posts

62 months

Friday 7th June
quotequote all
ScoobyChris said:
While I’m a big fan of AMG, doesn’t the Evo FQ-440 trump this?

Chris
Yes but it needed servicing much more often.

aeropilot

17,996 posts

169 months

Friday 7th June
quotequote all
donkmeister said:
The fact it's drivable and reliable enough for a warranty is what impresses me the most at that specific power output, in a mass production car!
Indeed.

Very impressive engineering in that regard.


Big GT

613 posts

34 months

Friday 7th June
quotequote all
I know Mercedes have a long tradition for making long lasting 4 cylinder engines. but I've always been a little sceptical of the reliability of small engines pushing big power. Hence regular maintenance needed on Impreza's and evo's of old.

so has anyone got first hand experience running high miles on 300-400bhp standard 4 pots like the VAG's, A45's and Jag's 300ps etc?








Jack4688

46 posts

95 months

Friday 7th June
quotequote all
Remember in 1998 when we were amazed at the 400ish horsepower from the E39 BMW M5’s 4.9 V8?

ScoobyChris

718 posts

144 months

Friday 7th June
quotequote all
Master Bean said:
Yes but it needed servicing much more often.
So the article should be:

Latest AMG four-pot is 'most powerful ever ... considering length of service intervals’ biggrin

Chris

Edward Robbins

15 posts

2 months

Friday 7th June
quotequote all
Very impressive figures for a four pot!

CedricN

430 posts

87 months

Friday 7th June
quotequote all
ScoobyChris said:
While I’m a big fan of AMG, doesn’t the Evo FQ-440 trump this?

Chris
I wouldnt call it a production car in the same sense as the merc, that was more of a small series special for a small market.

Very impressive by merc (especially impressive in the combination with the latest euro6 legislation), the car is not very interesting for me but this engine is really impressive from an engineering standpoint. 160bar Pmax on pump fuel indicates that they really have a great combustion concept, which results in 500Nm, pretty good for a petrol engine with full after treatment system.

pimpchez

882 posts

125 months

Friday 7th June
quotequote all
Had a look around the old one , pre facelift as the next shopping cart .
On paper it has everything and looks childish , sounded down right outrageous (in a good way to me but bad to any othe responsible adult ) .
However where it fell down (dash aside) was unbelievably to me the engine.

It felt light on torque (no big thump) , delivery was very flat and the rush to the redline was none existing . It didn't feel quick as the numbers say it should do , I actually thought it was broken. Research on draggy times confirmed they aint as fast i thought even when mapped.

This new engine is music to my ears , where do I place my pre order for 6yrs time 😂

MIP1983

189 posts

147 months

Friday 7th June
quotequote all
Shame they don't have a good looking car to put it in.

thelostboy

3,317 posts

167 months

Friday 7th June
quotequote all
Very impressive stuff!

People have cited the Mitsubishi before, but remember the Jap saloons - as impressive as they were - required servicing every 6,000 miles and had terrible fuel economy.

The 440 was basically an aftermarket tuner car (only 40 made) with a warranty.

I think when you also consider the emissions side of things, Mercedes have done a pretty amazing job, and it's good to see using clever technology being used for us petrolheads!

Reciprocating mass

5,392 posts

183 months

Friday 7th June
quotequote all
will it have a chocolate gearbox like the last a45
hehe

aeropilot

17,996 posts

169 months

Friday 7th June
quotequote all
MIP1983 said:
Shame they don't have a good looking car to put it in.
Harsh......

But true smile