Transmission
Clutch	"Borg and Beck" single dry plate
Gearbox	"Moss" 4 speed manual. Synchromesh on 2nd, 3rd and 4th. Ratios: 3.39, 1.98, 1.37, 1.00
Propeller shaft	"Hardy Spicer"
Rear axle	"Moss" 4.625:1 ratio, later "ENV" 4.55:1. Hypoid bevel gears. Semi-floating axle.

Suspension
Front	Beam axle, "Woodhead" leaf-springs, "Woodhead-Monroe" tubular dampers.
Rear	Fully floating (Moss) axle, change to semi-floating (ENV) axle. "Woodhead" leaf-springs. "Girling" lever-arm dampers, later "Woodhead-Monroe" tubular dampers

Brakes
Front	"Girling" Hydrastatic HSI (then leading shoe HLS from chassis 1240 onwards) 12" (30.48cm) x 1.656" (4.21cm) drums
Rear	"Girling" mechanical non-servo, 12" (30.48cm) x 1.656" (4.21cm) drums, then from chassis 1240 to 1806 drums were 12" (30.48cm) x 1.676" (4.26cm) then from chassis 1807 onwards, 12" (30.48cm) x 1.75" (4.45cm) drums

Chassis
Material	Mild steel (mostly 10swg)
Design	Mostly box section, plus tubular cross-members and a central crusiform of channel section. Underlsung at rear.

Bodywork
Construction	Traditional coach-built body bolted to chassis.
Materials	Aluminium-alloy panelling, 18swg for body-shell, 16swg for wings. Body frame of ash timber and birch plywood. Inner panels of mild steel and aluminium-alloy. Radiator cowl of brass. Most brightwork of chrome-plated brass.

Interior
Upholstery	Leather over Dunlopillo cushions.
Trim	Fine cloth, polished wood trim and dash, deep-pile carpeting.
Steering	Adjustable for reach and height
Dials/gauges	0-100mph speedometer, ammeter, water temperature, oil pressure, fuel gauge.

Dimensions
Length	15' 4" (467cm)
Width	5' 7" (170cm)
Height	5' 1" (155cm)
Wheelbase	9' 9" (297cm)
Front track	4' 7" (140cm)
Rear track	4' 7" (140cm) with Moss axle 4' 8" (142cm) with ENV axle
Ground clearance	7" (18cm)
Frontal area	24 sq. ft. (2.23 square metres)
Tyres	5.50 x 17, later 6.70 x 16

Ground clearance: The figure for 7" is as quoted in road tests and contemporary articles. I measured it to be 7.5" for the front axle, with the lowerest area of chassis/body 8.5" clear of the ground. The exhaust silencer (under the driver's seat) should be installed 'flat' to maintain ground clearance.

Other data
Kerb weight (with 5 gallons of fuel)	2912lbs / 26cwt / 1321kg
Weight distribution	48/52 front/rear
Fuel tank capacity	11.5 imperial gallons / 52 litres sometimes 10.5 gallons / 48 litres
Electrical system	12 volt "Lucas"
Tyre pressures	22psi (152kPa)

Note that original performance figures are likly to be improved upon today. "Pool" petrol of the 1940s helped to keep compression ratios low. In later years (1960s onwards), engines were often uprated, typically to 90bhp. For engine components to increase power and durability, see the AC Engine Project.

Performance (with 74bhp engine and Moss axle)
0-30mph (0-48km/h)	5.7 seconds
0-50mph (0-80km/h)	14.1 seconds
0-60mph (0-97km/h)	19.9 seconds
30-50mph (48-80km/h) in top gear	13.4 seconds
Max. speed	80mph (129km/h)

Performance (with 74bhp engine and ENV axle)
0-30mph (0-48km/h)	6.9 seconds
0-50mph (0-80km/h)	16.0 seconds
0-60mph (0-97km/h)	22.6 seconds
30-50mph (48-80km/h) in top gear	14.1 seconds
Max. speed	83mph (134km/h)

Performance (with 76bhp engine and ENV axle)
0-30mph (0-48km/h)	6.3 seconds
0-50mph (0-80km/h)	14.4 seconds
0-60mph (0-97km/h)	21.0 seconds
30-50mph (48-80km/h) in top gear	15.8 seconds
Max. speed	84mph (135km/h)