Rover KV6 engine
From Wikipedia, the free encyclopedia
The KV6 automotive engine is a techologically-advanced 24 valve, quad cam V6 engine, available in 2.5 litre or 2.0 litre, built by Powertrain Ltd which is a sister company to MG Rover. It is derived from their four-cylinder K-Series engine.
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[edit] History
First introduced into the Rover 800 series with the 1996 facelift, including the flagship Rover Sterling Saloon and Coupe models, it has since also powered the Rover 75 and its sister car, the MG ZT, as well as the Rover 45 and the MG ZS.
The engine was designed and developed by Rover at Longbridge to replace the Honda 2.7l V6 engine which was about to become non-compliant with tightening emissions legislation.The original unit was designed for low volume production but was later redesigned to fit into the smaller Rover 75's bonnet, although performance remained similar.
In 1994 the engine was licenced to Kia Motors who invested in a new plant at the Assan Bay complex to build the engine. This engine was used in several KIA vehicles. Its introduction in Korea shortly followed its use by Rover in the Sterling.
[edit] Other customers
Land Rover Freelanders (first generation), also used the KV6 engine.
Kia Sedona (first generation), otherwise known as Kia Carnival outside the UK and North America, was offered with the KV6 engine in some markets.
Gibbs Aquada, a high speed amphibious vehicle.
[edit] Technology
At introduction, the engine enjoyed considerable technological advancement compared with its competition, most notably being the lightest and shortest v6 in its class. Fully automatically tensioned drive belts and adaptive MEMS engine management, which alters firing in response to the style of the past two hundred miles of driving, also improve refinement. The engine boasts Variable Geometry Induction, whereby air induction pipe lengths vary to optimise engine torque in response to different engine and road speeds, aiding refinement and efficiency.
In its Rover setup, the unit delivers peak engine power of 175 PS (129 kW) at 6,500 rpm, and maximum torque of 240 N·m (177 ft·lbf) at 4000 rpm, prompting the late 1990s 'most powerful in its class' sales tag used to sell Rover 800 V6 models. Units in the Rover 800 are notable for their ability to change function from standard V6 firing to two straight-3 engines in response to heavy loads, such as towing. The automatic gearbox in V6 800s is also able to communicate with the engine, briefly easing torque to allow smoother changes.
One of the most immediately noticeable features of the first V6 engine to be designed by Rover for decades is its distinctive, quietly growling engine note .
[edit] Problems
A number of early units were seen off by head gasket failure brought about by poorly maintained production tolerances. This caused the height of the cylinder liners to vary resulting in over compression or under compression of the head gaskets. However, the redesign of the engine and its production facility, prior to the introduction of the Rover 75, cured this problem and it became one of the companies most reliable units. Problems remaining through until the end of production were largely confined to the inlet manifold mechanism (particularly the VIS valve motors) and leaking thermostat housings. A Kia manufactured variant of the engine was also fitted to the Kia Carnival (people mover) with disastrous results. Over 40% of Kia Carnivals sold in Australia required a new engine—some multiple engines—causing much stress to the owners.
