Identifying Features:
T40, short bonnet length. T40A small roadster, 8 plug block, ball gearchange

Years Made
(approx): 40, Mid 1926-30; 40A, 1930

Number Made:
830 (40 Type A)

Engine:
No of cylinders: 4
Bore x stroke: T40: 69 x 100mm; T40A: 72 x 100mm
Capacity: 1496cc, 1627cc
BHP (approx): T40: 45; T40A: 50
RPM Limit (prudent): 4500
Camshaft: sohc
Valves (per cylinder): 3
Camshaft drive: Front, bevel
Crankshaft bearings, No. and Type: 5 plain, plain rods
Carburettor: 1 Zenith, 36mm choke
Ignition: Coil
Plugs per cylinder: 1 (40A: 2)
Firing Order: 1, 2, 4, 3

Clutch:
Type: Wet, multi-plate

Gearbox:
Location: Central, Separate, 4-speed and reverse
Gear change lever: Central, Top back (not 40A)

Rear Axle:
Normal Ratio: 12/56 = 4.67 (spiral)

Dimensions:
Wheelbase: 101, 107in (2.564, 2.714m)
Track: 47.25in (1.2m)
Weight (approx): 2200lb (1000kg) (Roadster)

Brakes:
Location and Type: 4-wheel cable-operated

Wheels:
Type: Wire
Tyre size: original 27 x 4.40; modern fitment, 5.00 x 19

Crossbreeding with Other Types:
Gearbox, axles, brakes etc, as T38; T40 engine virtually identical with T37 except for crankcase arms. T40A engines use T49 block

NOTE: Engines from No. 616 have pressure feed lubrication