The Leyland PE166 (often referred to as the ''Rover-Triumph Straight Six'') is a

single overhead camshaft An overhead camshaft (OHC) engine is a piston engine where the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion cha ...

(SOHC)

Straight-six engine The straight-six engine (also referred to as an inline-six engine; abbreviated I6 or L6) is a piston engine with six cylinders arranged in a straight line along the crankshaft. A straight-six engine has perfect primary and secondary engine bala ...

developed by the Rover-Triumph division of

British Leyland British Leyland was an automotive engineering and manufacturing conglomerate formed in the United Kingdom in 1968 as British Leyland Motor Corporation Ltd (BLMC), following the merger of Leyland Motors and British Motor Holdings. It was partl ...

, and was exclusively used in the

Rover SD1 The Rover SD1 is both the code name and eventual production name given to a series of executive cars built by the Specialist Division (later the ''Jaguar-Rover-Triumph'' division) of British Leyland (BL), under the Rover marque. It was produced ...

(Rover 2300/Rover 2600) series of vehicles between 1977 and 1986.

Technical detail

The engine was loosely based on the older

Triumph I6 The Triumph Six Cylinder or Triumph I6 engine is a cast-iron overhead valve straight-six engine produced by Standard Triumph. It is an evolution of the Standard Motor Company's inline-4 Standard Eight, with the addition of two cylinders and a ...

(which it was intended to replace), and shares some internal components with that and the

Dolomite Sprint The Triumph Dolomite small saloon car was produced by the Triumph Motor Company division of the British Leyland Corporation in Canley, Coventry between October 1972 and August 1980. Background The Dolomite was the final addition to Triumph's ...

engines. Both the capacity variants use an bore, with a or stroke giving capacity respectively.

Background

Following

Leyland Motors Leyland Motors Limited (later known as the Leyland Motor Corporation) was a British vehicle manufacturer of lorries, buses and trolleybuses. The company diversified into car manufacturing with its acquisitions of Triumph and Rover in 1960 and 1 ...

' acquisition of both

Standard-Triumph The Standard Motor Company Limited was a motor vehicle manufacturer, founded in Coventry, England, in 1903 by Reginald Walter Maudslay. For many years, it manufactured Ferguson TE20 tractors powered by its Vanguard engine. All Standard's tracto ...

and the

Rover Company The Rover Company Limited was a British car manufacturing company that operated from its base in Solihull in Warwickshire. Its lasting reputation for quality and performance was such that its first postwar model reviewed by '' Road & Track'' i ...

in 1960 and 1967 (and the subsequent merger with the

British Motor Corporation The British Motor Corporation Limited (BMC) was a UK-based vehicle manufacturer, formed in early 1952 to give effect to an agreed merger of the Morris and Austin businesses.Morris-Austin Merger Company Named. ''The Times'', Friday, 29 February ...

to create British Leyland a year later), a unified model policy was developed, with Rover and Triumph reorganized into the Specialist Division. Proposals were developed for replacing both the

Triumph 2000 The Triumph 2000 is a mid-sized, rear wheel drive automobile which was produced in Coventry by the Triumph Motor Company between 1963 and 1977. It was introduced on 15 October 1963. It was styled by Giovanni Michelotti. It competed with the c ...

and the

Rover P6 The Rover P6 series (named as the 2000, 2200, or 3500, depending on engine displacement) was a saloon car produced by Rover and subsequently British Leyland from 1963 to 1977 in Solihull, Warwickshire, England, UK. The P6 was the first winner o ...

with a single product, codenamed SD1 (Specialist Division 1).

References

{{Reflist British Leyland engines Straight-six engines