Bentley R Type

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Bentley R Type
1953 Bentley R-Type standard steel saloon.jpg
Standard steel sports saloon 1953
Overview
Manufacturer Bentley Motors
Also called Bentley Mark VII
Production 1952–1955
2323 built
Assembly Crewe, United Kingdom
Body and chassis
Class Luxury car
Body style Standard 4-door saloon; otherwise as arranged with coachbuilder by customer
Layout FR
Related Rolls-Royce Silver Dawn
Powertrain
Engine 4.6 L IOE straight-6
130 hp (97 kW)(estimate)[1]
Transmission 4-speed manual
4-speed automatic (optional)
Dimensions
Wheelbase 120 in (3,048 mm) [2]
Length 200 in (5,080 mm) [2]
Width 69 in (1,753 mm) [2]
Height 64.5 in (1,638 mm) [2]
Chronology
Predecessor Mark VI
Successor S1
The big boot

The R Type is the second series of post-war Bentley automobiles, replacing the Mark VI. Essentially a larger-boot version of the Mk VI, the R type is regarded by some as a stop-gap before the introduction of the S series cars in 1955. As with its predecessor, a standard body was available as well as coachbuilt versions by firms including H. J. Mulliner & Co., Park Ward, Harold Radford, Freestone and Webb and others.

Other than the radiator grilles and the carburation there was little difference between the standard Bentley R Type and the Rolls-Royce Silver Dawn. The R Type was the more popular marque, with some 2,500 units manufactured during its run to the Silver Dawn's 760.

Design[edit]

During development it was referred to as the Bentley Mark VII; the chassis cards for these cars describe them as Bentley 7. The R Type name which is now usually applied stems from chassis series RT. The front of the saloon model was identical to the Mark VI, but the boot (trunk) was almost doubled in capacity.[citation needed] The engine displacement was approximately 4½ litres, as fitted to later versions of the Mark VI.[3] An automatic choke was fitted to the R-type's carburettor. The attachment of the rear springs to the chassis was altered in detail between the Mark VI and the R Type.[4]

For buyers looking for a more distinctive car, a decreasing number had custom coachwork available from the dwindling number of UK coachbuilders. These ranged from the grand flowing lines of Freestone and Webb's conservative, almost prewar shapes, to the practical conversions of Harold Radford which including a clamshell style tailgate and folding rear seats.[peacock term]

Running gear[edit]

All R Type models use an iron-block/aluminium-head straight-6 engine fed by twin SU Type H6 carburettors.[citation needed] The basic engine displaced 4,566 cc (278.6 cu in) with a 92 mm (3.62 in) bore and 114.3 mm (4.50 in) stroke.[3] A 4-speed manual transmission was standard with a 4-speed automatic option becoming standard on later cars.

Brakes and suspension[edit]

The suspension was independent at the front using coil springs with semi elliptic leaf springs at the rear.[3] The brakes used 12.25 in (311 mm) drums all round and were operated hydraulically at the front and mechanically at the rear via a gearbox driven servo.[citation needed]

Performance[edit]

A four door saloon with automatic transmission tested by the British magazine The Motor in 1953 had a top speed of 101.7 mph (163.7 km/h) and could accelerate from 0-60 mph (97 km/h) in 13.25 seconds. A fuel consumption of 15.5 miles per imperial gallon (18.2 L/100 km; 12.9 mpg-US) was recorded. The test car cost £4481 including taxes.[2]

Coachbuilders' bodies[edit]

R-Type Continental[edit]

Continental coupé by H. J. Mulliner
Continental coupé by H. J. Mulliner

The R-Type Continental was a high-performance version of the R-Type. It was the fastest four-seat car in production at the time.[5]

The prototype was developed by a team of designers and engineers from Rolls-Royce Ltd. and H. J. Mulliner & Co. led by Rolls-Royce's Chief Project Engineer, Ivan Evernden.[6] Rolls-Royce worked with H. J. Mulliner instead of their own coachbuilding subsidiary Park Ward because the former had developed a lightweight body construction system using metal throughout instead of the traditional ash-framed bodies.[7]

The styling, finalised by Stanley Watts of H. J. Mulliner,[8] was influenced by aerodynamic testing conducted at Rolls-Royce's wind tunnel by Evernden's assistant, Milford Read. The rear fins stabilised the car at speed and made it resistant to changes in direction due to crosswinds.[9]

A maximum kerb weight of 34 long hundredweight (1,700 kg) was specified to keep the tyres within a safe load limit at a top speed of 120 mph (190 km/h).[10]

The prototype, with chassis number 9-B-VI[10] and registration number OLG-490, which earned it the nickname "Olga",[4] was on the road by August 1951.[10] Olga and the first series of production Continentals were based on the Mark VI chassis, and used a manual mixture control on the steering wheel boss, as these versions did not have an automatic choke.[4]

The early R Type Continental has essentially the same engine as the standard R Type, but with modified carburation, induction and exhaust manifolds along with higher gear ratios.[11] The compression ratio was raised to 7.25:1 from the standard 6.75:1,[3] while the final gear ratio was raised (lowered numerically) from 3.41 to 3.07.[12]

Continental coupé by H. J. Mulliner
Continental coupé by Park Ward

Despite its name, the two-door Continental was produced principally for the domestic home market, most of the 207 cars produced were right-hand drive, with 43 left-hand drive examples produced for use abroad. The chassis was produced at the Rolls-Royce Crewe factory and shared many components with the standard R type. R-Type Continentals were delivered as rolling chassis to the coachbuilder of choice. Coachwork for most of these cars was completed by H. J. Mulliner & Co. who mainly built them in fastback coupe form. Other coachwork came from Park Ward (London) who built six, later including a drophead coupe version. Franay (Paris) built five, Graber (Wichtrach, Switzerland) built three, one of them later altered by Köng (Basel, Switzerland), and Pininfarina made one. James Young (London) built in 1954 a Sports Saloon for the owner of the company, James Barclay.

Continental drophead coupé by Park Ward

After July 1954 the car was fitted with an engine with a larger bore of 94.62 mm (3.7 in), giving a total displacement of 4.9 L (4887 cc/298 in³).[citation needed]

Production numbers[edit]

  • R Type: 2323 (295 with coachbuilt bodies)[13]
  • R Type Continental: 208[5] (including the prototype)

Notes[edit]

  1. ^ by the Auto Editors of Consumer Guide (2007-07-18). "HowStuffWorks "1952-1955 Bentley R-Type"". Auto.howstuffworks.com. Retrieved 2011-12-18. 
  2. ^ a b c d e "The B7 Bentley with automatic transmission". The Motor. October 14, 1953. 
  3. ^ a b c d Culshaw & Horrobin 2013, p. 83.
  4. ^ a b c Bennett 2009, p. 17.
  5. ^ a b Egan 1990, p. 120.
  6. ^ Bennett 2009, pp. 13–14.
  7. ^ Bennett 2009, pp. 11, 14.
  8. ^ Bennett 2009, pp. 14–15.
  9. ^ Bennett 2009, p. 15.
  10. ^ a b c Bennett 2009, p. 16.
  11. ^ "Used Car test: Bentley Continental". Autocar 130 (3824): 47–48. 29 May 1969. 
  12. ^ Egan 1990, p. 121.
  13. ^ King 2006, p. [page needed]

References[edit]

External links[edit]