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 manufactured by sinteron and a stainless-steel exhaust 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.
The 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.
The 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.[WIKI]
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