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Lagonda 3 litre 6 cylinder
 

In 1925 Lagonda introduced a six cylinder car called the 16/65 which was 2692cc (69 x 120mm) and with push rod operated overhead valves. Although designed by Davidson and Masters who were responsible for the 2 litre and produced, legend says, at the direct insistence of Brigadier General Metcalfe who was the Director, it didn't prove very popular; in 1928 it was bored out to 2931 cc to become the three Litre. Although never as popular as the two litre, it had a long model run, finishing in 1934 and being succeeded by the 31/2 litre which used yet another variant of the same engine in a different chassis. Outwardly, the 2 litre and 3 litres of the Vintage period look remarkably alike but the latter has a longer bonnet and a distinctive sump shape which enables them to be distinguished

One variant of the 3 litre sometimes encountered is the "Selector Special" of 1932 which has a Maybach gearbox with eight forward ratios. Not many were made. Both 16/65 and 3 litres used a 10'9" wheelbase but there are two kinds of chassis. The earlier Z chassis bears a distinct family resemblance to the 2 litre and a few early high chassis cars exist. Later and coinciding with the introduction of the Selector Special a heavier chassis with straighter (in plan) side members, tubular cross members and different axles was adopted and it was this ZMB chassis which was developed into the 41/2 litre M45. The 3 litre was also bored out during its life but the engine size change does not coincide with the chassis change. The earlier cars are 72 x 120 mm (2931 cc) and later ones 75 x 120 mm (3181 cc). Both versions have seven-bearing crankshafts. On the 1932 cars a new radiator badge featuring stylized wings was introduced and this became a feature of all subsequent Lagondas.

Lagonda have always been a sporting concern and a programme of long-distance events were entered with 2 litres and later 3 litres. In 1928 D'Erlanger & Hawkes came 11th at Le Mans after running with a cracked frame and no front brakes for the bulk of the event and, in 1929, another team was entered but with no success.
 

Wheelbase 3048 mm 120 in  
Track front      
rear      
Length 4318 mm 170 in  
Width 1676 mm 66 in  
Kerb weight      
engine
Manufacturer Lagonda
Type S-6
OHV
12 valves total
2 valves per cylinder
Bore stroke 65.00mm 100.00mm
2.56 in 3.94 in
Bore/Stroke ratio 0.65
Displacement 1991 cc
(121.498 cu in)
Unitary capacity 331.83 cc/cylinder
Compression ratio 6.50:1
Fuel system 2 SU carbs
Aspiration Normal
Max. output 68.9 PS (68.0 bhp) (50.7 kW)
@4500 rpm
Coolant Water
Specific output 34.2 bhp/litre
0.56 bhp/cu in
Top speed 129 km/h
chassis
Engine location Front
Engine alignment Longitudinal
Suspension Front LA.SE.
Rear LA.SE.
Transmission 4M
Drive RWD
Top gear ratio 1.00
Final drive ratio 4.60