Energy transfer: AMG’s new turbo-Four goals greater with extra horsepower
A smaller package deal simply obtained a much bigger bang.
On Friday, Mercedes-Benz AMG unveiled its most power-dense engine but, a 416-horsepower turbo-Four destined for the automaker’s 45 Collection line someday quickly.
The two.Zero-liter turbo-Four is the substitute for the 381-hp engine discovered underhood the CLA45, GLA45. The brand new engine, which is available in two tunes together with a 382-hp base model and a 416-hp S model, makes use of a extra environment friendly turbocharger and upgraded cooling to enhance efficiency and will arrive in future AMG 45-Collection automobiles together with the GLA45, CLA45, and A45—maybe extra.
The brand new turbo-Four makes use of a brand new all-aluminum cylinder block with similar dimensions to the outgoing engine, and most of its parts are new. In comparison with the outgoing model, the brand new engine is flipped within the engine bay and locations the turbochargers and exhaust manifold nearer to the firewall with the consumption up entrance. It’s an evolution of the AMG principal, “Scorching stuff and chilly stuff don’t combine,” though it created very particular issues.
AMG M 139 Engine
Cold and warm
Specifically, cooling the brand new engine with turbos positioned thus far into the engine bay was a big problem, in line with engineers. The brand new engine options separate cooling programs for the block and the cylinder heads, 18% bigger exhaust valves, and a specifically designed engine cowl that redirects air towards the turbochargers for extra cooling. The air conditioner may additional cool the engine. The cylinder coating is slicker too, and the 0W-20 oil it makes use of in is a decrease viscosity for higher cooling. The digital wastegate, which is extra environment friendly this time round, was designed to deal with extra warmth.
At its coronary heart, new turbos force-feed the turbo-Four extra air for larger energy. The compression ratio was elevated from Eight.6:1 to 9.Zero:1, and though its 416 hp (in S variations) was rated with 95-octane gas, AMG mentioned when it arrives within the U.S. the brand new engine ought to charge nicely on 93-octane gasoline—even run on decrease octane gas if wanted. The brand new turbochargers spin as much as 169,000 rpm and create 30.5psi of enhance strain, in comparison with 26.1 psi for the outgoing turbocharger. That’s partially as a consequence of curler bearings used within the twin-scroll turbo that allow it spin extra freely, much like the AMG GT Four-Door Coupe’s twin-scroll turbos discovered within the twin-turbo Four.Zero-liter V-Eight.
When it was introduced, the outgoing engine’s 187.5 hp per liter of displacement within the GLA45 and CLA45 was probably the most energy dense manufacturing engine on the planet. The brand new engine unveiled Thursday takes over that prime spot and is probably the most highly effective manufacturing turbo-Four constructed from a mainstream automaker with 208 hp per liter
The brand new turbo-Four additionally debuts AMG’s latest manufacturing course of that also pairs one engine technician with one engine, however partially automates the manufacturing course of with carts and instruments that journey alongside the manufacturing line with engineers mechanically.
AMG’s Chief Working Officer Emmerich Shiller mentioned the brand new course of is 25-30 % extra environment friendly for the engine builders who take about two hours to hand-build every turbo-Four engine.
AMG M 139 Engine
Energy to the individuals
When the engines first seem in AMG 45 Collection automobiles later this yr, their energy supply may shock followers of the small automobiles. That’s as a result of the outgoing engine within the GLA45 and CLA45 had a flatter torque curve that arrived rapidly and stayed flat all through many of the rev vary.
The brand new turbo-Four has a extra linear torque curve this time, with an preliminary surge of torque arriving at roughly 2,000 rpm and constructing towards its peak of 369 pound-feet at round 5,200 rpm (354 lb-ft at Four,800 rpm within the base model). The outgoing engine’s 350 lb-ft arrived at 2,000 rpm and stayed flat till 5,000 rpm.
“We already set the benchmark within the section with the previous engine,” AMG boss Tobias Moers mentioned. “Not solely is the output per liter unrivalled for a turbocharged engine, the excessive stage of effectivity additionally demonstrates that the inner combustion engine nonetheless has additional potential.”
The brand new engine additionally revs extra freely, too. The engine revs as much as 7,200 rpm, greater than the outgoing mannequin, and it makes as much as 416 hp at 6,750 rpm in S variations, 382 hp in base variations.
AMG didn’t say something in regards to the new turbo-Four’s future, however in comparison with the twin-turbo V-6 present in 43 Collection fashions, the brand new engine could make extra horsepower and almost the identical quantity of torque.
We’ll know extra when the engine hits the streets within the U.S., which ought to be later this yr.