Aston Martin DB2 group S (1949)
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Chassis numbers

Specifications

1949: 4 units built (116 HP)
1950: 5 units built (125 HP)
1950: 402 units built (105 HP customer cars)

Click here
Click here for 1949 prototype with 115 HP
Click here for 1950 works cars with 125 HP
Click here and here and here for 1950-1952 customer cars

Lagonda VB6E, straight 6 cyl, 4 stroke, petrol engine. Click here
Designed by Willie Watson under the guidance of W.O.Bentley
78.0 x 90.0 mm (3.07 x 3.543 in)
2580 cc (157ci)
Standard LB6B/, compression ratio 6.5:1; 105 bhp @ 5,000 rpm, 125 lbs/ft @ 3000 rpm
'Vantage' LB6V/, 8.16:1 compression ratio 125 bhp @ 5,000 rpm, 140 lbs/FT @ 2400 RPM
LB6E/ engine (fitted to a few cars), 7.5:1 116 bhp @ 5,000 rpm

LB6B/ engines 2 x SU H4 (1½" bore) carburetors, GB needles.
LB6V/ had HV6 (1¾") carburetors.
VB6B/ had larger induction manifolds and 2 x SU HV6 (1¾") carburetors, RJ needles.
LB6E/ engine, 2 x SU H6 (1¾" bore) carburetors larger induction manifolds, RJ needles

BS1452 Grade 220 cast iron block, cast iron head with Hemispherical combustion chambers
he crankcase was of a cast iron 'barrel' type, wet liner design with 3 round cast light alloy 'cheeses' which bolted around a 4 main bearing crankshaft, the (rear 3) cheeses housed shell type main bearings, the crankshaft was a fairly advanced part counterbalanced design with a thin scroll seal & thrower ring at the rear of the engine, this crank was fitted in from the rear of the crankcase & passed through the crankcase to the 'intregral to the block' front main bearing housing, the big end journals (bearing) were originally white metal direct into the connecting rod, soon changed to shell bearings fitted into the rods, pistons were a light alloy 6.5:1 compression ratio 4 ring design. The pressed tin sump was filled with 14 or so pints of oil which was then circulated by a twin 'vane' gear type pump
The inlet manifolds were of cast light alloy & water heated, the exhaust manifolds cast iron with cup type fittings to the exhaust downpipe
steel crankshaft with 4 main bearings
chain driven (104 links) SOHC, 1950: (84 links) DOHC. 2 valve / cyl - 12 valves total, 38.5mm inlet valve diameter, 34.7mm exhaust valve diameter, 38.1mm diameter cam follower, 8.8mm valves lift
12 volt system and dynamo, KLG 10mm L30 spark plugs (Vantage: KLG 10mm ProL80), Contact breaker gap 0.012"
water cooled

David Brown, 4 speed manual gearbox
1st: 2.92/1
2nd: 1.98/1
3rd: 1.33/1
4th: 1.00/1
R: 2.92/1
final drive, 3.77/1, rear differential
2 door coupe Aluminum bodyshell over Tubular Steel Spaceframe Chassis. The bonnet and wings were a single unit, hinged at the front, lifting to gain access to the engine
f suspension, Trailing Arms with Armstrong lever dampers, Coil Springs, Anti-roll Bar
r suspension, Live Salisbury Axle with trailing links, transverse Panhard rod and Coil Springs
Marles P3691 (2") cam and double roller steering, click here and here and here
Girling Hydrualic 12" diameter cast-iron drums all around. Total friction area, front and rear, 152 sq. in.
length, 4299 mm / 169.3 in (1949)
width, 1651 mm / 65.0 in
height, 1359 mm / 53.5 in
wheelbase, 2515 mm / 99.0 in
front track, 1372 mm / 54.0 in
rear track, 1372 mm / 54.0 in
wheels, wire 16"
tires, front 5.75×16", rear 6.00×16", or 600 x 16 Dunlop or Avon
1130kg (works), 1950: 1200kg (road version)
fuel tank, 86 lt
frontal area, 1.86 m2


Results in famous races (until 1952) and in WSCC (1953+)

Season
115 hp
Car entry, chassis number Car number/ result
Targa Florio Mille Miglia Le Mans Dolo miti Pescara
Date 20/3 24/4 26/6 17/7 15/8
Team 1080km 1600km 24h 500km
Aston Martin, LMA/49/3 #19, water loss
Arthur Jones/ Nick Haines, LMA/49/2 #27, 7th
Mrs R. P. Hichens, LMA/49/1 #28, fatal acci dent
Total points
4
4
Statistics
Works Starts/finishes 3/1 3/1
Drivers Team entries and car number
Aston Martin
Leslie Johnson 19
Charles Brackenbury 19
Mrs R. P. Hichens
Pierre Maréchal 28
T.A.S O. Mathieson 28

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Drawings

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