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Bentley 3 litre (1921 - 1929)


 

W.O. Bentley realised his ambition to built the first true all-English sports car with the first prototype Bentley 3 Litre in 1919, though careful testing prior to start of production caused considerable delay and not before 1921 the first car was delivered to customer. The four cylinder engine with four valves per cylinder became renowned for its sturdiness and Bentley fielded works entries in the most severe competitions like the Tourist Trophy and the 24 Hours at Le Mans with considerable success. This boosted sales at the factory and provided the information for constant improvement. In addition to the basic version TT models and Speed models were offered. The Super Sports, of which only 18 were built, was capable of exceeding the magic figure of 100 mph.

3 Bentley 3 Litre Experimental
1088 Bentley 3 Litre
513 Bentley 3 Litre Speed Model
18 Bentley 3 Litre Super Sports
1622 Bentley 3 Litre altogether

 

Wheelbase 3048 mm 120 in  
Track front 1422 mm 56 in  
rear 1422 mm 56 in  
Length 4343 mm 171 in  
Width 1740 mm 68.5 in  
Kerb weight 1778 kg 3920 lb  
Type S-4
SOHC
16 valves total
4 valves per cylinder
Bore stroke 80.00mm 149.00mm
3.15 in 5.87 in
Bore/Stroke ratio 0.54
Displacement 2996 cc
(182.827 cu in)
Unitary capacity 749 cc/cylinder
Compression ratio 4.30:1
Fuel system 2 SU carbs
Aspiration Normal
Max. output 71 PS (70.0 bhp) (52.2 kW)
@3500 rpm
Coolant Water
Specific output 23.4 bhp/litre
0.38 bhp/cu in
Specific torque  
Note: A value of -1 means that
the car cannot attain that speed.
0-100mph -1.00s
Top speed 129 km/h
Power-to-weight 39.37 bhp/ton
chassis
Engine location Front
Engine alignment Longitudinal
Drive RWD
Top gear ratio 1.00
Final drive ratio 3.78