Bentley 4½ Litre ‘Blower’ 

  • 1929-1931
  • 175 HP 4.4L
  • 130 mph
Later in the year more 4½ Litre Bentleys were fitted with Birkin's blower system and one placed second in the RAC Tourist Trophy, but they never won a race.
It was the vision and product of Sir Henry Ralph Stanley 'Tim' Birkin who persuaded Bentley to produce 50 examples of the model.

Road Tests Real world tests of the Bentley 4½ Litre ‘Blower’

Top speed

4½ Litre ‘Blower’
130 mph
Venom GT
270 mph
Agera R
260 mph

Data points Key details of the Bentley 4½ Litre ‘Blower’

Number built

4½ Litre ‘Blower’
55 cars
300 cars
4 cars


4½ Litre ‘Blower’
175 HP
Venom GT
1,200 HP
Agera R
1,115 HP

In The News From around the web


Bentley 4½ Litre ‘Blower’
With it's front mounted supercharger, the became one of Walter Owen Bentley's quintessential British sportscars.
Excessive weight of the car due to huge brakes, large chassis & a bulky rear axle put the car in a class of its own.

Specifications Full list of technical specs


Brand Bentley
Type of car Production car
Year 1929-1931
Number built 55 cars


Drivetrain RWD
Gearing Traditional
# of gears 4 gears

suspension, wheels & brakes

Front brakes Disc
Rear brakes Disc
Front wheels 533/? 152
Rear wheels 533/? 152

physical dimensions

Curb weight 4,250 lb
Width 68.5 in
Height 63 in
Length 172 in
Front track width 54.5 in
Wheelbase 130 in

road tests

Top speed 130 mph

power & handling

Power-to-weight ratio 24.29 lb/hp
Maximum hp 175 HP @ 3,500 RPM
Steering system Rack and pinion


Displacement 4,398 cc
Air compressor Supercharger
Fuels Gas
Bore/stroke 3.94 in / 5.51 in
Valvetrain Single overhead camshaft (SOHC)
Valves per cylinder 4 valves
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