blackblizzard82 ha scritto:
saturno_v ha scritto:
in poche parole, non mi sognerei mai di paragonare un duemila turbodiesel BMW ad uno Coreano, mentre per quanto riguarda l'ultimo 2 litri turbo Hyundai...provare per credere!!!
provato, e creduto. che i coreani devono fare ancora tanta strada. sai qual è l'origine di quel motore? se ti dico qual è la base di partenza, non ci credi nemmeno tu.
Quel motore e' di origine Mitsubishi e nelle iterazioni successive e' subentrata la collaborazione tecnica con Hyundai (vengono prodotti in uno stabilimento in joint venture) che ha portato agli step evolutivi denominati Theta (il nome del motore appunto) e Theta II.
Ci ha investito anche Chrysler nel progetto.
La versione modificata del Theta (e nel caso di Chrysler semplificata) montata sulle Mitsubishi e Chrysler viene definita "Wold Engine"
Mi pare che il 2 litri turbo Hyundai e quello Mitsubishi montato sulla Evo abbiano la stessa cubatura pur non essendo identici nella struttura del blocco.
http://en.wikipedia.org/wiki/Hyundai_theta_engine
Se lo hai provato avrai notato che e' un'ottimo propulsore....oltre al fatto di avere consumi irrisori (sui modelli provati da me)
Alcuni dettagli tecnici
Theta II
It features hollow stainless-steel DOHC with powder-metal cam lobes, pent-roof combustion chambers and shimless bucket tappets in the cylinder head.
BorgWarner Morse TEC supplies the complete timing system which uses the company's proprietary silent timing chains. Continuously variable valve timing (CVVT) works on the intake side.
The aluminum alloy engine block, which is formed using a high-pressure die-cast method, has a unique Metaldyne-supplied cassette-type balance shaft module with a two-stage oil pump built-in. In the lower-end, the block is reinforced by a ladder frame. Other notable features include fracture-split sinter-forged connecting rods and a stainless-steelexhaust manifold.
Theta's EMS (engine management system) software is EMS-II from Siemens VDO and the 32-bit PCM (Powertrain Control Module) calculates the amount of intake air by utilizing a contamination-proof hot-film type MAF (mass air flow) sensor.
In the 2011 Hyundai Sonata and Kia Optima, this engine has Gasoline Direct Injection and produces between 198 hp (148 kW; 201 PS)-200 hp (149 kW; 203 PS) and 184 lb·ft (249 N·m) -186 lb·ft (252 N·m) of torque.
MPI version of the 2.0L Theta engine has a 10.5:1 compression ratio, and it produces 163 hp (122 kW; 165 PS) at 6,200 rpm and 146 lb·ft (198 N·m) of torque at 4,600 rpm and is available in the Middle East.
MPI version of the 2.4L Theta engine has a 10.5:1 compression ratio, and it produces 176 hp (131 kW; 178 PS) at 6,000 rpm and 168 lb·ft (228 N·m) of torque at 4,000 rpm and is available in the Middle East.
2.0T GDI turbo
The Theta engine is turbocharged for use in the Genesis Coupe. In this form it produces 210 hp (213 PS) @ 6,000 rpm on 87 octane (AKI) gasoline, and 223 hp (226 PS) on 93 AKI. Torque remains the same at 223 lb·ft (302 N·m) @ 2000 rpm. The Theta block used is very similar to the Mitsubishi Evolution X 4B11T, as core components like pistons and rods are said should move freely between them[1], however, the two engines are not identical.
The turbo used is a Mitsubishi TD04 model. In stock trim this unit pushes a peak of approx. 16-18psi with a sustained 14psi. This value can be changed with a boost controller and tuning.
The 2.0L GDI turbo in 2011 Sonata develops 274 hp (278 PS) and 269 lb·ft (365 N·m) of torque. The fuel economy is rated at 22mpg (10.7L / 100KM) in the city and 34mpg (6.92L / 100KM) on the highway. It comes exclusively with a 6-speed automatic transmission. The engine has a maximum boost of 17psi and features twin-scroll turbocharger.
