FPT - 1.8 in Alluminio, Turbo ID, doppio Variatore, fino a 300 CV

[Scott]

stavo per partire con un what's GEMA? poi san google e santa wikipedia han fatto il miracolo ed ora so... quindi con Chrysler è stato 'incorporato' anche il progetto GEMA? il 2.4 che devono montare su Dart di cui tutti dicono sia assolutamente necessario è il GEMA, quindi (mi rispondo da solo, ni, è il tigershark evoluzione GEMA con tecnologia MAir 2-da wikipedia)?

"Chrysler bought out the shares of Mitsubishi and Hyundai" ergo non ci sono in giro Mitsu e Hunday con il GEMA?

Chrysler, Mitsubishi e Hyundai hanno ciascuna una famiglia di motori derivante dal progetto comune sviluppato sotto la jv GEMA e denominato "World Engine". Ora che la jv è cessata, ognuna va per la sua strada (ad es: i Tigershark sono solo Fiat-Chrysler), però la radice comune rimane.

[lorenso]

una domanda, ma il motore che equipaggia la 4c è questo in oggetto oppure per ora monta il 1750 di giulietta con i vari aggiornamenti e modifiche?

[J-Gian]

una domanda, ma il motore che equipaggia la 4c è questo in oggetto

E' quello in oggetto

Verrò montato tra un po' di mesi anche su Giulietta, con tanto di cambio doppia frizione.

[max_pershin]

At first glance, you’d be forgiven for thinking that there’s a very familiar setup to the powertrain arrangement in Alfa Romeo’s new halo product – the stunning 4C. After all, here’s an Alfa with a very recognizable 1.7-liter, four-cylinder turbo engine, but take a closer look underneath the hood and one will find a raft of new engineering measures that are actually quite a bit different from anything the Italians have trotted out before.

Granted, the 1,742cc base shares plenty of hardware and architecture with the unit in the, but, says Alfa, the 4C heart is vastly reworked and more complex, to the point that it’s even been given its very own 939 B1000 code. For starters, the short-stroke engine is 22kg lighter than its stablemate’s similarly dimensioned four-cylinder design. The key reason for this is that Alfa now uses an aluminum block rather than the Giulietta’s cast-iron version, and fits it with diecast cylinder inserts. Alfa says this block, cast by a subsidiary of Fiat Powertrain (FPT), makes the

block both lighter and more rigid. It also eschews balancing shafts for reasons of weight, rotating mass and packaging. Instead, there are eight crankshaft counterweights to help keep it balanced, and keep the pistons, built by KS Kolbenschmidt in Neckarsulm, Germany, spinning nice and smoothly.

Another major change is that the engine in the 4C actually sits in an odd place by modern Alfa Romeo standards. It’s made Alfa’s engineering job demonstrably easier by essentially picking up the entire front end of the Giulietta Quadrifoglio Verde, turning it around and putting it behind the front seats of its carbon fiber baby sports car.

Okay, so that’s only a mild exaggeration, but there’s plenty to be said about possible crossover the two cars. While the front end uses a multilink suspension arrangement, there are inboard MacPherson Struts down the back and the untrained eye would regard it as a mirror image of a Giulietta architecture, minus steering rack.

But back to the powertrain. There are things that remain from the Giulietta’s strongest engine variant, the most obvious of which is the 83mm bore and the 80.5mm stroke. However, both the Bosch software tuning and the FPT hardware are different, as befits the 1.7’s new role as a mid-engined, featherweight sports car motor after its promotion from mid-sized, front-drive family hatchback worker.

The cylinder heads have been redesigned, specifically around the intake ducts, while there are modifications for the intake and exhaust manifolds. The use of dual continuous variable valve timing on the intake and the exhaust valves is retained, while its direct fuel injection system is capable of multiple injections per stroke.

Not quite hardcore Alfa hasn’t gone all the way into the hardcore world of sports cars with the development of the new engine, simply because it’s a wet-sump unit, but the team has worked hard on turbocharging arrangements. The single variable-vane BorgWarner charger delivers up to 21.75psi of boost pressure

Change of heart and Alfa claims to have all but eliminated turbo lag thanks to a new scavenging control system.

This setup, developed by FPT, uses the ECU to continuously adjust the timing and overlap of the intake and exhaust valves at low engine speeds so there is always enough air traveling across the blades of the turbocharger to keep it spinning. It also introduces a pulse converter exhaust manifold that uses natural pressure waves to boost torque at low revs. Both the manifold and the turbine are made from microcast steel to withstand temperatures of more than 1,000°C, and it all operates with a control logic wastegate adjustment system to vary the boost depending on the driving demands. It combines this with up to 200 bar of fuel-injection pressure to deliver

an engine with 245ps of power at 6,000rpm and 350Nm of torque from 2,100 to 4,000rpm.

That means the 4C’s engine sets new standards for specific output, including delivering an astonishing figure of more than 200Nm per liter and 165ps/liter. For a sub-900kg car, that’s enough energy to push deep into proper sports car territory, while still delivering a fuelconsumption figure of 6.8 liters/100km (41.5mpg) and 157g of CO2/km.

Yet for all the work that has gone into improving this motor, it may not be the last powerplant Alfa will use in the 4C. The company

confirmed the creation of a new, 1.8-liter, in-line, turbo four-cylinder engine to the Giulietta and, with a target output of 300ps, it’s difficult to see this being overlooked for sports car work.

Engine Technology International - Homepage

[Nostalgico88]

domanda: ma perchè non è stato progettato con distribuzione a catena?

[Beckervdo]

domanda: ma perchè non è stato progettato con distribuzione a catena?

Costi.

[_hainz]

Adattabilità alla linea di montaggio esistente. Tra l'altro Volkswagen è tornata indietro. È passata da cinghia a catena e poi è tornata alla cinghia per questioni di consumi, un risparmio per un'auto di circa 2 g di CO2 sul ciclo omologativo

[TonyH]

Vedendo poi la fine che fanno molte catene ( anche sul 1.3) meglio la cinghia.

[boygrunge]

Vedendo poi la fine che fanno molte catene ( anche sul 1.3) meglio la cinghia.

dai, dura 190000km anziché i 250000km preventivati "per un controllino" :§

sempre se hai il meccanico (o tu stesso) con un buon orecchio da accorgersi che è troppo rumorosa....

[Guest EC2277]

Queste sono soddisfazioni: quando ero l'unico (o quasi) a sostenerlo, mi beccavo del fesso. È bello vedere che altri mi danno ragione.