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Bentley 4 Litre (1931)


In a valiant attempt to break new ground the Bentley 4 Litre was introduced in 1931 and broke with many traditions of the company. The F-head engine (inlet over exhaust) designed by Ricardo and developed by Bentley neither met the demands of the typical Bentley clientele nor did it attract buyers from the area of prospective Rolls-Royce purchasers. It is not entirely fair though to dismiss the Bentley 4 Litre as being mainly responsible for Bentley having been in such a sad state that they were forced to call in the receiver in 1931. The company's financial situation had been a rather weak one even prior to this final Bentley from Cricklewood appearing on the market. 50 cars were produced.

Wheelbase 3404 mm 134 in  
Track front 1422 mm 56 in  
rear 1422 mm 56 in  
Length 4851 mm 191 in  
Width 1740 mm 68.5 in  
Kerb weight 1981 kg 4367 lb  
Type S-6
12 valves total
2 valves per cylinder
Bore stroke 85.00mm 115.00mm
3.35 in 4.53 in
Bore/Stroke ratio 0.74
Displacement 3915 cc
(238.908 cu in)
Unitary capacity 652.5 cc/cylinder
Compression ratio 5.50:1
Fuel system 2 SU carbs
Aspiration Normal
Compressor type N/A
Max. output 121.7 PS (120.0 bhp) (89.5 kW)
@4000 rpm
Coolant Water
Specific output 30.7 bhp/litre
0.5 bhp/cu in
Power-to-weight 60.58 bhp/ton
Engine location Front
Engine alignment Longitudinal
Drive RWD
Top gear ratio 1.00