Singer Sm Roadster Series 4ad (1951)

Singer Sm Roadster Series 4ad (1951)

The Car

Coming soon

The Specs

Below are the technical specifications and any performance numbers we could get.


Bore & Stroke 73mm x 89.4mm
Displacement 1497cc
Firing order 1,3,4,2
Oil pressure (hot)
30 – 35 lb./sq. in. at 30 mph in top gear

Fuel Supply

Carburetor Solex FAI D/D
Choke 24
Main 125
Air Correction 230
Pilot 45
Starter Petrol 115
Starter Air 4


Intake tappet clearance 0.004″ (hot)
Exhaust tappet clearance 0.006″ (hot)
Valve-timing indication ¼ on flywheel rim
Intake valve opens 10° BTDC


Breaker gap 0.012″
Plug gap 0.025″
Ignition timing indication ¼ on flywheel rim
Ignition timing 4° – 5° BTDC


Clutch type Borg & Beck Single Dry Plate 8A6G
Clutch linings


Brake type Girling Hydraulic Front; Mechanical Rear
Brake linings

Wheel Alignment

Toe-In 1⁄8” unladen
Camber 1° laden
Caster angle 2° laden
King pin angle 7° laden