Riley 15/6 Adelphi. (1935-38)

The Adelphi body was a natural choice for the 15/6 chassis, when it was introduced in 1936, and survived until the end. It had proved to be a popular model with other engines, so adapting it to fit the slightly different 15/6 chassis was not difficult. It subsequently became the second best seller, behind the ever-popular Kestrel.
The body was a large and spacious 5 seater, 6 light saloon with a sumptuous interior as befitted the larger engine and higher price. As with the other 15/6 models, there were few obvious points to identify the 6 cylinder car beside a V8 or Big 4 model. However, the smoother engine retained some fans, and it is thought that Riley still built a few special order 15/6 Adelphis after the receivers had been called in in February 1938.

Chassis Types: 46A, 47A, 48A


6cyl ohv
RAC rating 14.3hp
Bore 62 Stroke 95.2
Firing order 1, 5, 3, 6, 2, 4.
Capacity 1726cc
51bhp at 4500rpm
Carburation Zenith


4-speed Armstrong Siddeley Preselector gearbox.
Top gear ratio 5.5:1
3rd g/r 7.84:1
2nd g/r 11.64:1
1st g/r 20.09:1
Reverse 25.19:1




Girling Mechanical rod with Wedge operated shoes.
13" Drums.


0-50mph 13.5 secs
Standing Quarter Mile 21.4secs
Max speed 85mph
Fuel Consumption 18mpg


Wheelbase 9'4.5" (aprx 2850mm)
Track 4'3" (aprx 1280mm)
Length 14'5" (aprx 4360mm)
Width 5'1" (aprx 1530mm)
Fuel Tank 11½ galls
Wheels Dunlop Centre lock wire 3.0x18"
Tyres 4.75x18
Weight 24.5cwt


46A £380
47A £385
48A £405
Special Series = £48 more.