Riley RM
| Riley RM Series | |
|---|---|
| Overview | |
| Manufacturer | Riley |
| Production | 1945–55 |
| Body and chassis | |
| Class | Executive car (E) |
| Body style |
|
| Layout | FR layout |
| Dimensions | |
| Wheelbase | 1.5 L cars – 112 in (2,845 mm) 2.5 L cars – 119 in (3,023 mm) |
| Length | 1.5 L cars – 179 in (4,547 mm) 2.5 L cars – 186 in (4,724 mm) |
| Width | 63 in (1,600 mm) |
| Height | 59 in (1,499 mm) |
| Chronology | |
| Predecessor |
|
| Successor | Riley Pathfinder |
| Riley RMA | |
|---|---|
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manufactured 1952
|
|
| Overview | |
| Production | 1945–52 10,504 produced. |
| Body and chassis | |
| Body style | 4-door saloon |
| Powertrain | |
| Engine | 1.5 L Straight-4 as for 2½-litre Big Four but bore 69mm by stroke 100mm and bhp 60 @5,300 rpm |
| Chronology | |
| Predecessor | Riley 12/4 and Riley 12 |
| Successor | Riley RME |
| Riley RMB | |
|---|---|
 |
|
| Overview | |
| Production | 1946–52 6900 produced |
| Body and chassis | |
| Body style | 4-door saloon |
| Powertrain | |
| Engine | 2.5 L Straight-4 |
| Dimensions | |
| Wheelbase | 119 in (3,023 mm) |
| Length | 186 in (4,724 mm) |
| Width | 63.5 in (1,613 mm) |
| Height | 59 in (1,499 mm) |
| Chronology | |
| Successor | Riley RMF |
| Riley RMC | |
|---|---|
manufactured 1949
|
|
| Overview | |
| Production | 1948–51 507 produced |
| Body and chassis | |
| Body style | 2-door open 2/3-seater |
| Powertrain | |
| Engine | 2.5 L Straight-4 |
| Riley RMD | |
|---|---|
manufactured 1950
|
|
| Overview | |
| Production | 1949–51 502 produced |
| Body and chassis | |
| Body style | 2-door cabriolet |
| Powertrain | |
| Engine | 2.5 L Straight-4 |
| Riley RME | |
|---|---|
first registered July 1953
|
|
| Overview | |
| Production | 1952–55 3446 produced |
| Body and chassis | |
| Body style | 4-door saloon |
| Powertrain | |
| Engine | 1.5 L Straight-4 |
| Chronology | |
| Predecessor | Riley RMA |
| Successor | Riley One-Point-Five (1957) |
| Riley RMF | |
|---|---|
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first registered March 1953
|
|
| Overview | |
| Production | 1952–53 1050 produced |
| Body and chassis | |
| Body style | 4-door saloon |
| Powertrain | |
| Engine | 2.5 L Straight-4 |
| Chronology | |
| Predecessor | Riley RMB |
| Successor | Riley Pathfinder |
| Riley 2½-litre Big Four | |
|---|---|
| Overview | |
| Manufacturer | Riley Motors Limited |
| Also called | Riley 16 h.p. |
| Production | 1937 to 1957 |
| Combustion chamber | |
| 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) |
| Cylinder block alloy | cast iron, aluminium sump, alloy pistons |
| Cylinder head alloy | cast iron, hemispherical combustion chambers, spark plugs in centre between valve covers |
| Valvetrain | 90-degree angled overhead valves operated by twin high-lift camshafts moving rockers with short light stiff push-rods powered from the crankshaft by duplex roller chains |
| Compression ratio | 6.9 : 1 |
| Combustion | |
| Fuel system | Twin H4 SU carburettors mechanical petrol pump |
| Fuel type | petrol |
| Oil system | pressure fed from sump by submerged gear-type pump driven by skew gear from camshaft |
| Cooling system | water, thermostatically controlled flow, belt-driven water pump and radiator fan |
| Output | |
| Power output | 106 bhp @ 4,500 rpm Tax rating 16hp |
| Chronology | |
| Predecessor | none before 1937 |
| Successor | Riley RMH then BMC C-Series engine |
The Riley RM Series is an executive car which was produced by Riley from 1945 to 1955. It was the last model developed independently by Riley prior to the 1952 merger of Riley's still new owner Nuffield, with Austin to form BMC. The RM series was originally produced in Coventry, but in 1949 production moved to the MG works at Abingdon. The RM models were marketed as the Riley 1½ Litre and the Riley 2½ Litre.
There were three types of RM vehicles produced. The RMA was a large saloon, and was replaced by the RME. The RMB was a longer car to carry the larger engine and was replaced by the RMF. The RMC and RMD were limited-production cars, an open 2 or 3-seater and a 4-seater cabriolet. All of the RM vehicles featured the pre-war Riley race developed 1.5 L (1496 cc) 12 hp (RAC Rating) or the successful 1937 new 16 hp (RAC Rating) 2.5 L "Big Four" straight-4 engines with hemispherical combustion chambers and twin camshafts mounted high at the sides of the cylinder block.
The RM was a face-lift of their pre-war 1½ or 2½ Litre Kestrel.
The RMA was the first post-war Riley. It was announced in August 1945 with the news it would become available in the autumn. It used the 1.5 L engine and was equipped with hydro-mechanical brakes and an independent suspension using torsion bars in front. The body frame (not to be confused with the chassis) was made of wood in the English tradition, and the car featured traditional styling. The car was capable of reaching 75 mph (121 km/h). The RMA was produced from 1945 until 1952 when it was replaced by the RME.
Riley RMA 1½-Litre 4-Door Saloon 1949
Riley RMA 1½-Litre 4-Door Saloon 1952
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Wikipedia