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Riley 2½-litre Big Four
Riley 2½-litre Big Four
Overview
Manufacturer	Riley Motors Limited
Production	1937–57
Layout
Configuration	straight four
Displacement	2.443 L (149.1 cu in)
Cylinder bore	80.5 mm (3.17 in)
Piston stroke	120 mm (4.7 in)
Valvetrain	high-lift camshafts, push-rod operated 90 degree angled overhead valves
Compression ratio	6.9 : 1
Combustion
Fuel system	Twin H4 SU carburettors
Output
Power output	106 bhp (79 kW) @ 4,500 rpm; Tax rating 16hp

Riley Pathfinder
Riley Pathfinder
	Riley Pathfinder
Overview
Manufacturer	Riley Motors Limited
Production	1953–57; 5536
Designer	Gerald Palmer
Body and chassis
Class	Full-size car
Body style	4-door saloon
Powertrain
Engine	2.5-litre, twin-cam Straight-4
Transmission	4-speed manual, optional overdrive; 3-speed automatic (from 1956)
Dimensions
Wheelbase	113.5 in (2,883 mm)
Length	183 in (4,648 mm)
Width	67 in (1,702 mm)
Height	60 in (1,524 mm)
Chronology
Predecessor	Riley RMF
Successor	Riley Two-Point-Six

The Riley Pathfinder is an automobile which was produced by Riley Motors Limited in the United Kingdom from 1953 to 1957. It was first presented at the London Motor Show in October 1953 and replaced the RMF as Riley's top-line model.

Designed as the "RMH" just before the 1952 merger of Riley-parent, the Nuffield Organization, with Austin to form BMC, the Pathfinder is seen as the last proper Riley car. It used Riley's 110 bhp (82 kW), 2.5-litre — 2,443 cc (149.1 cu in) — twin-cam, "Big Four" straight-4 engine fitted with twin SU carburettors and had a separate all-steel chassis with coil spring rear (this was changed to leaf springs towards the end of production) and front torsion bar independent suspension. From 1956, an overdrive gearbox became optional. The 12 in (305 mm) Girling drum brakes had a Clayton Dewandre Vac Hydro Servo fitted as standard.

In the front, buyers could choose between two single seats and the optional full width bench seat, with the front corner of the seat squab contoured so as to accommodate the gear lever and allow seating for three. The rear seat had a fold down centre armrest and leather covers were used. A heater was fitted as standard.^[3] The car was available in black, maroon, green, blue or grey finish. The gear lever was floor mounted by the driver's door, so drivers in right hand drive markets had to change gear with their right hand.^[5] The handbrake was operated by a lever under the dashboard in both bench and individual front seat versions.

The body was similar in appearance to the Wolseley 6/90, although there were detail differences such as the Riley's opening bonnet including the radiator grille, whereas the Wolseley's grille was fixed. The Riley was launched in 1953 and the Wolseley in 1954, and both were designed by Morris' Gerald Palmer for the Nuffield Organization before the merger. All Pathfinders featured the front independent suspension developed from the RMF, but the sophisticated Riley rear suspension was replaced by a conventional leaf spring type in the last few examples. An essential part of the location of the rear axle was a Panhard rod which on some early examples sheared on hard cornering resulting in the unfortunate 'Ditchfinder' nickname.^[2]

A car tested by The Motor magazine in 1955 had a top speed of 99.5 mph (160.1 km/h) and could accelerate from 0-60 mph (97 km/h) in 16.8 seconds. A fuel consumption of 19.5 miles per imperial gallon (14.5 L/100 km; 16.2 mpg_‑US) was recorded. The test car cost £1240 including taxes.^[3]

The Pathfinder was replaced by the short-lived Wolseley 6/90-derived Riley Two-Point-Six in 1957.

Die-cast models

Corgi No. 205 (production 1956–61), Riley Pathfinder, approximately O scale (1:44).^[6]
Corgi No. 205M (production 1956–59) Riley Pathfinder, approximately O-scale (1:44) with friction drive.^[6]
Corgi No. 209 (production 1958–61), Riley Pathfinder Police car, approximately O-scale (1:44).^[7]
Base Toys produced a 00 scale model of the Riley Pathfinder^[8]

References

^ The Observer's Book of Automobiles, 1956, pages 227–228
^ ^a ^b Robson, G. (2006). A-Z of British Cars 1945-1980. Herridge Books. ISBN 0-9541063-9-3.
^ ^a ^b ^c ^d ^e ^f "The Riley Pathfinder". The Motor. 8 December 1955.
^ ^a ^b ^c ^d ^e ^f ^g ^h Rileyrob. "Healey Silverstone (1949-51)". Retrieved 31 January 2014.
^ Gloor, Roger (2007). Alle Autos der 50er Jahre 1945 - 1960. Stuttgart: Motorbuch Verlag. ISBN 978-3-613-02808-1.
^ ^a ^b Ramsey, John (1984). The Swapmeet and Toyfair Catalogue of British Diecast Model Toys. Swapmeet Toys and Models. p. 138. ISBN 095093190X.
^ Ramsey, John (1984). The Swapmeet and Toyfair Catalogue of British Diecast Model Toys. Swapmeet Toys and Models. p. 163. ISBN 095093190X.
^ Base C500 Series - Riley Pathfinder, toysnz.com Retrieved 21 November 2015