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Rover K Series cylinder head rebuild part 2.
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Rover 200 - Used Car Overview & Buying Advice
Rover 200 - Used Car Overview & Buying Advice
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This article is about the Rover engine. For the Honda engine series of the same name, see Honda K engine.
A 1.8T DOHC K-Series engine in a MG 7

The K-Series engine is a series of engines built by Powertrain Ltd, a sister company of MG Rover. The engine was built in two forms: a straight-four cylinder, available with SOHC and DOHC, ranging from 1.1 litre 1.8 litre; and the KV6 V6 variation.

Design history[edit]

The cylinder block of a United Kingdom Rover K-series 16-valve DOHC engine with damp liner cylinders

The K-Series was introduced in 1988 by Rover Group as a powerplant for the Rover 200 car. It was revolutionary being the second volume production implementation of the low pressure sand casting technique in a new plant sited between East Works and Cofton Hacket (the first volume application of the L.P.S. casting process had been for the M-16 cylinder head, produced in South Works, adjacent to the former forge). This works by pumping liquid aluminium into a chemically bonded sand mould from below. This process gave advantages in limiting the occurrence of oxide inclusions and giving a casting yield of around 90% (c.f. 60% for more conventional gravity casting processes. This production technology overcame many of the inherent problems of casting aluminium components and consequently permitted lower casting wall thickness and higher strength to weight ratios. However, the process required the use of heat treated LM25 material which gave the engines a reputation for being fragile. An engine overheat would often result in the material becoming annealed and rendering the components scrap. The aluminium engine blocks were fitted with spun cast iron cylinder liners that were initially manufactured by GKN's Sheepbridge Stokes of Chesterfield, but replaced by spun cast iron liners made by Goetze after some seminal research conducted by Charles Bernstein at Longbridge,[citation needed] which proved influential even to Ducati for their race engines. Unfortunately a large number of aftermarket engines, the so-called "VHPD"s" were built with the old substandard GKNs by Minister, Lotus and PTP well after the Goetze liner's introduction to the production line in 2000.

The engine was introduced initially in 1.1 litre single overhead cam and 1.4 litre dual overhead cam versions. As Honda stopped providing Rover with engines after the end of their relationship, but well before the BMW takeover, an enlargement of the K Series design to 1.6 and 1.8 litres was carried out. This was done by using larger diameter cylinder liners and also increasing the stroke. The change required a block redesign with the removal of the cylinder block's top deck and a change from "wet" liners to "damp" liners.[1] The plastic throttle body fitted to the engine until 2001 was manufactured by the SU Carburettor company. They also included aluminium and larger sized bodies.

The engines were held together as a sandwich of components by long through-bolts which held the engine under compression, though this construction is not unknown in early lightweight fighter engines from the First World War. It had also been used in motorcycle engines and Triumph Car's "Sabrina" race engine. The V6 engines are more conventional engines that do not make use of the through bolts to hold the head to the block.

The two types of head that were bolted to the common four-cylinder block were designated K8 (8 valves) and K16 (16 valves). A later head design also incorporated a Rover-designed Variable Valve Control (VVC) unit (derived from an expired AP patent). This allowed more power to be developed without compromising low-speed torque and flexibility. The VVC system constantly alters the inlet cam period, resulting in a remarkably flexible drive—the torque curve of a VVC K-series engine is virtually flat throughout the rev range and power climbs steadily with no fall-off whatsoever until the rev limiter kicks in at 7,200 rpm.

Following the collapse of MG Rover in 2005, the Chinese automaker Nanjing Automobile acquired the Longbridge plant, this included the intellectual property rights to many designs, including those of the K series engine. The Chinese owner, now SAIC Motor, went on to further develop the K series engine, renaming it "N series" and using it to power it's current range of MG cars the MG 6. The revisions included a different design of cylinder head gasket, higher tensile strength through-bolts and a stronger oil-rail fitted in the bottom end of the engine that the through bolts screw into. These revisions are sold by the British company XPart to solve the issues that some K series engines had of cylinder head gasket failure.[2]

Engine management[edit]

K8 engine[edit]

Early K8 engines used a single SU KIF carburetter with a manual choke and a breaker-less distributor mounted on the end of the camshaft. MEMS Single point injection became standard with the launch of the Rover 100 in 1994.

K16[edit]

K16 models used MEMS With a 1.6 ECU on 1990 to 1994 or a 1.9 ECU On 1995 onwards electronic engine management in either Single Point or Multi Point forms, with a single coil on the back of the engine block and a distributor cap and rotor arm on the end of the inlet camshaft. MEMS 2J was used on the VVC engine, to control the Variable Valve Control and also the distributorless ignition system, which was necessary thanks to having camshaft drive belts at both ends of the engine. With the launch of the Rover 25 and Rover 45 in 1999, MEMS 3 was introduced, with twin coils and sequential injection.

KV6[edit]

Early KV6 as used in the Rover 800 used MEMS 2J, which controlled the three wasted spark coil packs and variable intake manifold geometry. The later KV6 used Siemens EMS 2000.

Model range[edit]

1100[edit]

All 1100 engines displace 1.1 L (1,120 cc/68 cu in). Four variations were created:

  • SOHC K8 8-valve, Carburettor, 60 hp (44 kW)
  • SOHC K8 8-valve, SPI, 60 hp (44 kW)
  • SOHC K8 8-valve, MPI, 60 hp (44 kW)
  • DOHC K16 16-valve, MPI, 75 hp (55 kW)

Cars that came with the 1100:

1400[edit]

1.4-litre DOHC K-Series engine in a MG ZR

Engine Codes: 14K2F (8V), 14K4F (16V), 14K16 (16V)?

All 1400 engines displace 1.4 L (1,396 cc/85 cu in). Six variations were created:

  • SOHC K8 8-valve, Carburettor, 75 hp (55 kW)
  • SOHC K8 8-valve, SPI, 75 hp (55 kW)
  • SOHC K8 8-valve, MPI, 75 hp (55 kW)
  • DOHC K16 16-valve, SPI, 90 hp (66 kW)
  • DOHC K16 16-valve, MPI, 82 hp (61 kW)
  • DOHC K16 16-valve, MPI, 103 hp (76 kW)

The K16 82 hp variant is exactly the same as the 103 hp (77 kW) version, apart from a restrictive throttle body designed to lower the car's insurance group; the 90 hp (67 kW) Spi features single-point fuel injection rather than the multi-point of the later engine.

Cars that came with the 1400:

1600[edit]

Engine Code: 16K4F

All 1600 engines displace 1.6 L (1,588 cc/96 cu in). Two variations were created:

Cars that came with the 1600:

1800[edit]

Engine Codes: 18K4F, 18K4K (VVC variants)

All 1800 engines displace 1.8 L (1,795 cc/109 cu in). Six variations were created:

  • DOHC K16 16-valve, MPI, 117 to 120 hp (86 to 88 kW)
  • DOHC K16 16-valve, MPI, 136 hp (100 kW)
  • DOHC K16 16-valve, MPI, VVC, 145 hp (107 kW)
  • DOHC K16 16-valve, MPI, VVC, 160 hp (118 kW)
  • DOHC K16 16-valve, MPI, turbocharged, 150 to 160 hp (110 to 118 kW)
  • DOHC K16 VHPD - Very High Performance Derivative 16-valve, MPI, 177 hp (130 kW) or 192 hp (142 kW) (Lotus version) (Uses VVC unique cylinder head casting (similar to VVC casting), has big valves, but with fixed cam timing - No development input was requested from Rover)

Cars that came with the 1800:

References[edit]

  1. ^ Adcock, Ian (1996). Project Phoenix: the birth of the MGF. Bloomsbury. p. 175. ISBN 0-7475-2695-8. 
  2. ^ "XPart provides Caterham owners with ‘ultimate fix’ for K-series engine". Motorsport Industry Association. 2 December 2009. Retrieved 1 March 2014. 

Further reading[edit]

  • Engine Overhaul Manual. Rover K-Series. MG Rover Group. 
  • Hammill, Des (2008). The Rover K-series 16V Engine. 1989-2005. CP Press. ISBN 1-84155-688-2. 
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