MGB group 3 (1962)
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Preparation manual

Specifications

Production numbers
Year, Roadster, GT
1962 4518
1963 23308
1964 26542
1965 24179 524
1966 22675 10241
1967 15128 11396
1968 17355 8352
1969 18896 12134
1970 23866 12704
1971 22511 12169
1972 26222 13171
1973 19546 10208
1974 19713 9638
1975 19967 4609
1976 25860 3698
1977 24482 4198
1978 21703 5652
1980 10891 3424

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Homologation number: 72, 198, 508, 560 (GT), 3016 and 3017
Homologation start: 9/10/1962, 1/6/1965, 1/1/1966, 1/4/1967, 1/4/1970

BMC B series, 18G (3 main bearings), in February 1964 positive crank-case breathing was introduced and the engine prefix changed to 18GA, until October 1964, when a five-bearing crankshaft design was introduced, the engine prefix became 18GB, straight 4 cyl, 4 stroke, petrol engine
1798cc
80.26 x 89.0 mm
9.5:1
cast iron block, 252.4mm deck height
cast iron head
18G: 3 main bearings 54mm diameter, 18GA: five-bearing version appearing in 1964
connecting rod big end bearing tunnel 47.7mm diameter
aluminium alloy piston with 42.07 mm compression height
SOHC chain driven, 2 valves per cyl - 8 valves total, 39.8mm inlet valve diameter, 34.2mm exhaust valve diameter. 2 coil springs per inlet/exhaust valves
aspiration, natural with 2 x SU HS4 or 1 x Weber 45 DCOE carburetors
firing order 1-3-4-2, Lucas 25D4 ignition system with centrifugal and vacuum advance, 1 x Lucas HA12 coil, 12V battery, Lucas C40/1 dynamo, Lucas M418G starter motor
wet sump with 1 oil cooler ARH181
4 speed manual gearbox
1962 to 1967: non-synchromesh, straight-cut first gear
1968+: full synchromesh
3rd and 4th gears overdrive
final drive, 3.909/1 (43/11), 4.100/1 (41/10), 4.300/1 (43/10), 4.55/1 (41/9), 4.875/1 (39/8), 3.307/1 (43/13)
Borg & Beck DSG, dry single disc clutch, 203mm diameter
rack and pinion, 2.93 turns lock to lock
wheels, 4.5 x 13', 5.5J x 14'
tires, 5.60 x 14'
fuel tank, 55 lt, 1965: 109 lt


Results in WSCC

Season races for GT 1.0+

Group GT, under 2.0cc classification is noted in brackets
Car entry, chassis number Car number/ result
Dayt Sebring Targa Florio Spa Nurb Cons uma Ross feld Le Man Wies baden d' Auve rgne Freiburg Tourist Trophy Ollon Inter Europa TdF Bridgeh
Team 3h 12h 500km 1000km Hill climb Hill climb 24h rally Hill climb Hill climb 500km
BMC, CHN3/3699 #47, bear ings* #155, acci dent
Ecurie Safety Fast #48, bear ings
Alan Hutcherson/ Paddy Hopkirk, CHN3/3699 (Hardtop) #25, dnf #31, 12th (7th)
Patrick Godfrey #101, 64th
Patrick Vanson/ Roger Derolland #154, 11th
Al Pease #53, dns
Statistics
Works Starts/finishes 8/3 2/0 1/0 1/1 1/1 2/1 1/0
Drivers Team entries and car number
BMC
Andrew Hedges 155
John Sprinzel 155
Ecurie Safety Fast
Jim Parkinson 47
Jack Flaherty 47
Denise McCluggage 48
Christabel Carlisle 48

*Ecurie Safety Fast entry


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