1948 Road Test
2 1/2 LITRE RILEY SPORTS THREE-SEATER,  
as described in The Autocar, March 19, 1948.

PRICE, with open three-seater body, not quoted in Great Britain. Export only at present.
RATING : 16 h.p., four cylinders, overhead valves, 80. X 120 mm, 2443 c.c.
BRAKE HORSE-POWER: 100 at 4,500 r.p.m. COMPRESSION RATIO: 6.85 to I.
WEIGHT, without passengers : 27 cwt 2 qr. LB per C.C. : 1.26.
TYRE SIZE : 6.oo x 16in on bolt-on steel disc wheels.
LIGHTING SET : 12-volt. Automatic voltage control.
TANK CAPACITY: 20 gallons : approximate fuel consumption range, 20-24 m.p.g.
TURNING CIRCLE: (R) 36ft; (L) 37ft.
MINIMUM GROUND CLEARANCE: 7in.
MAIN DIMENSIONS : Wheelbase, 9ft 11in. Track, 4ft 4 1/4in (front and rear). Overall length, 15ft 6in width, height 4 ft 7in.

ACCELERATION Overall
From rest through gears to: sec.
30 m.p.h. .. .. 5.9
50 m.p.h. .. .. 14.0
60 m.p.h. .. .. 19.0 
70 m.p.h. .. .. 28.0 
80 m.p.h. .. .. 38.3  Steering wheel movement from lock to lock : 3 turns. 

(The later Two Seater versions were the same as the saloons, at 2.5 turns)
Speedometer correction by Electric Speedometer Car Speedometer Electric Speedometer 10 = 10
20 = 20
30 = 29.75
40 = 39
50 = 48
60 = 58
70 = 66.25
80 = 76
90 = 85.75

Speeds attainable on gears
1^st 21-26
2^nd 40-44
3^rd 60-65
Top 98

WEATHER: Dry, warm; fresh wind. Acceleration figures are the means of several runs in opposite directions.

The Autocar went on to say...“This open model on the 21/2-litre Riley chassis represents a return to an open car in the modern style by a firm which through the years has usually offered open sports cars in addition to closed models. The current three-seater was designed with a view particularly to the American market and under present conditions it is unfortunately purely an export model. to the extent that no home market price is quoted for it. The price overseas varies, of course, on different markets but it is understood that it is closely comparable with that of the 21/2-litre saloon.No attempt has been made to provide a car with a very much higher maximum speed than that of the fleet saloon, and the same gear ratios are used.

Characteristically, the body is solidly built and there is thus no very great saving of weight over the saloon. With the latest engine, developing 100 brake horse power. the test results show that the acceleration performance is in some respects better than that of the saloon previously tested by The Autocar. An impression is certainly gained of the all-round performance being brisker than the saloon’s.It is intended purely as a two-three-seater of sporting character and additional seats are not provided in the tail of the body, which is devoted to a luggage locker of truly vast capacity. By the use for the first time on a Riley of a steering-column gear change the full benefit of a one-piece type of seat is gained as regards useful width available and ease of getting in and out by either door.

This open model feels every bit as “solid ‘ on the road as the closed car in spite of the absence of the stiffening effect of a steel roof, a fact which emphasizes the rigidity of the box-section frame which forms its foundation. The export nature of this model was stressed by the fact of the car undergoing test being fitted with left-hand drive.So well-known is the behaviour of the 21/2 litre Riley saloon, which has proved so successful in the post-war period, that it was no surprise to find that the natural cruising speed is in the region of 75 m.p.h., and this is a thoroughly comfortable rate on a top gear of 4.11 to 1.

The genuine maximum available closely approaches 100 m.p.h., with a fine surge of acceleration available on second and third gears. But it can be treated a good deal as a top gear car, for the engine proves decidedly more flexible at low speed than earlier examples, and picks up strongly the pinking that occurs under such conditions on the petrol at present available in Great Britain would probably be absent on fuels of higher octane value obtainable else-where.

This car’s averaging capabilities on a journey are al altogether exceptional. and it puts its 45 miles or so into an hour with consummate ease even over the usual English roads that constantly provide handicaps in the shape of bends and speed limits."

How many were made?

   Designed for an American export market that never came good (only 50 went there), just 507 were made. The early ones (121 only) were made in Coventry, and from 1949 to 1951 the balance came from Abingdon.

Numbers produced were:

1949.  259

1950.  241

1951.  7

Let’s put this in perspective. There were 72,507 E-Type Jaguars made, and around 40,000 survive today. Like all Rileys, these Roadsters are rare.

Variations from the saloons.

The car was not called a Roadster initially; this did not happen until late 1949. The correct name was a “Three Seater Tourer”

    Some changes.

1. The chassis had additional outriggers to suit the Roadster body mountings.

2. The front suspension cradle is from a 1 1/2 to lower the bodywork.

3. Front shock absorbers were different

4. Rear springs had 9 leaves (instead of 11 in the saloons)

5. A shorter radiator was used.

6. Different bumper brackets support the heavy bumpers (set at 18" from the ground for the American market)

7. The petrol tank holds 20 gallons (up from 12.5)

8. The steering column was offset to the driver’s side to provide more room for three people.

9. The steering wheel was 17" (instead of 18")

10. An additional steering box changed the steering to 3 turns lock to lock, instead of 2 1/4. This extra steering box was dropped for the later two seaters.

11. The dashboard and firewall is further back. This necessitates special pedals and assemblies, longer cables for the choke etc, longer pipe to the oil gauge, different brake pipes and exhaust pipes.

Every single panel on the car was unique. Even the similar front guards and running boards are different to saloons. The grill is 2" shorter, cut down from the sedan versions. The dashboard is wider, and the fuel gauge is different. A petrol gauge switch allows different reading between the two tank senders. This was called a ‘reserve level switch’, but in fact there was no actual reserve fuel...

12. The boot lid and doors of the Roadsters were individually "fitted" to their particular body and marked with the last three digits of the body No. in wax crayon on the inside face before being removed for separate spraying.

Some experimenting was done by the factory to make a four seater version, and about six or so examples were built. They never went into production. The car looked something like a Riley Lynx, with two more seats extending into the large boot area.

1950.

The ‘2 seater’ model was launched, doing away with the horrible steering column gear change and reduction steering box. These cars have 2S in their chassis numbers, rather than the SS of the earlier cars.

The Australian Riley Roadster Census.

We continue to update the list of Roadsters in Australia. This was prompted by Peter Hocking’s (WA) revelation that 134 of these came to Australia, out of 507 produced.

The starting point was a hand written list from 1977, covering various sightings around the East Coast. These were loaded into a database, and circulated to the various states. Fortunately, Western Australia (Peter Hocking) and QLD (Michael Branwell) were well organised; other states less so.

The only way to reduce the incidence of double counting was to use chassis numbers. Registration numbers change, and so do engine numbers. At this point the list includes 93 Australian Roadster chassis numbers. 51 cars are known to be currently complete and existing; the others have not been confirmed (that I know of) in the last 15 or 20 years.

Of the other 24 listed but without chassis numbers, some are records waiting on the owners or registrars in each state to advise the numbers, and others are described cars, often with registration numbers, but also are old records. Another 17 cars are thought to have been imported, but details are not known at all of these. I know of some cars that were wrecked.

 A couple of cars have been exported. But think about it. Around 70 or 80 Roadsters may be out there hidden in  chook sheds...

The list is purely a historical document, but will become increasingly useful for owners in the future. These cars are already 50 years old, and knowledge of their past adds value to them.

RM Rileys imported to Australia

  Colours and trim.

Hubcaps on Roadsters were generally chromed instead of painted .

Wheels were sometimes painted to match the hood and upholstery, which matched unless to special order.

Black wings were available with all paint colours.

Between September 1948 and April 1949 standard colours were:

• Ivory paint with red trim.
• Black paint with red trim
• Scarlet paint with beige trim
• Light green paint with beige trim.
• Ming blue paint with beige trim.

After April 1949 to January 1951, available colours were:

• Black paint with beige, red or green trim.
• Autumn red paint with beige trim.
• Clipper blue paint with beige trim.
• Red paint with beige or red trim.
• Ivory paint with beige or red trim.
• Almond green paint with beige trim.
• Sun bronze paint with beige trim.