Identifying Features:
Long wheelbase GP, with wide rear spring base. Starting handle inside front cross tube; cast alloy wheels, unusually large brake drums. Square blower relief hole.

Years Made
(approx): 1932-4

Number Made:
4 or 5

Engine:
No of cylinders: 8
Bore x stroke: 86 x 107mm
Capacity: 4972cc
BHP (approx): 300
RPM Limit (prudent): 4500
Camshafts: dohc
Valves (per cylinder): 2
Camshaft drive: Front, spur train
Crankshaft bearings: 9 plain, plain rods
Supercharger: Bevel driven Roots
Carburettor: 2 Zenith
Ignition: Magneto
Plugs per cylinder: 1
Firing Order: 1, 6, 2, 5, 8, 3, 7, 4

Clutch:
Type: Dry, multi-plate

Gearbox:
Location: Separate, central, 3-speed and reverse
Gear change lever: external

Rear Axle:
Normal Ratio. 12/46 = 3.83*

Dimensions:
Wheelbase: 108.3in (2.75m)
Track: 53.1in (1.35m)
Weight (approx): 2100lb (950kg)

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

Wheels:
Type: Cast alloy, fixed rim
Tyre size: Original 28 x 4.75;* modern fitment 5.00 x 19

Crossbreeding with Other Types:
T50 engine; similar engine to T53. Chassis similar to T55 and T47

* This tyre size and gearing is as originally listed. At least 1 car has 13/45 gears and 6.00 x 20 tyres on 20in GP wheels. The 1932 British catalogue quoted 13/45 and 29 x 5.00 tyres