Hyundai Theta engine – Wikipedia, the free encyclopedia

29 Aug 2014 | Author: | Comments Off on Hyundai Theta engine – Wikipedia, the free encyclopedia
Hyundai NF

Hyundai Theta engine

The Hyundai Theta (G4KC) is a gasoline 4-cylinder automobile engine family. The third all-aluminum engine of Hyundai Motor Company debuted in the fourth-generation Hyundai Sonata sedan (codenamed NF), which was unveiled in August 2004 [ citation needed ] in South Korea. Hyundai Motor Manufacturing Alabama (HMMA) is currently building a Theta II engine shop on the grounds of their Montgomery, Alabama automobile factory.

The shop will build only the Theta II engine for both the Hyundai plant and the new Kia Plant in West Point, GA. It was completed in August 2008.

Contents

Global Engine Alliance [ edit ]

The Global Engine Alliance was a joint venture between Chrysler. Mitsubishi Motors. and the Hyundai Motor Company for developing a line of shared engines 4-cylinder engines. The initial design of the engine block and cylinder head was handled by Hyundai. However, each manufacturer configured their variants of the initial design differently based on their needs.

In 2009, Chrysler bought out Mitsubishi and Hyundai’s stake in the joint-venture, however each company retained rights to build the engines.

Technical details [ edit ]

Theta [ edit ]

The first version of the Theta Engine had two variants, the 2.0L and the 2.4L. The 2.0L version (G4KD) is an Inline 4-cylinder engine that carries a bore and stroke of 86#160;mm and a 10.5:1 compression ratio; the engine makes 143#160;hp (107#160;kW; 145#160;PS) at 6,000 rpm and 140#160;lb·ft (190#160;N·m) of torque at 4,000 rpm. It uses a timing chain instead of belt, and the engine dry weight is 134#160;kg (295#160;lb).

The 2.4L version (G4KC) is an Inline 4-cylinder engine that carries a bore of 88#160;mm, stroke of 97#160;mm and a 10.5:1 compression ratio; the engine makes 163#160;hp (122#160;kW; 165#160;PS) at 5,800 rpm and 166#160;lb·ft (225#160;N·m) of torque at 4,000 rpm. It uses a timing chain instead of belt, and the engine dry weight is 146#160;kg (322#160;lb).

Theta II [ edit ]

2.0L – G4KA

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.

Hyundai NF

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#160;hp (148#160;kW; 201#160;PS)-200#160;hp (149#160;kW; 203#160;PS) and 184#160;lb·ft (249#160;N·m) -186#160;lb·ft (252#160;N·m) of torque.

The MPI version of the 2.0L Theta engine has a 10.5:1 compression ratio, and it produces 163#160;hp (122#160;kW; 165#160;PS) at 6,200 rpm and 146#160;lb·ft (198#160;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#160;hp (131#160;kW; 178#160;PS) at 6,000 rpm and 168#160;lb·ft (228#160;N·m) of torque at 4,000 rpm and is available in the Middle East .

Applications [ edit ]

Theta/Theta-II Engine – 2.0L (1998cc) [ edit ]

Hyundai NF
Hyundai NF
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