Swallow Doretti Mk I (1954) drophead coupé (convertible coupé) - technical specifications of 1954 Swallow Doretti Mk I

(1954 model)

Brief specs of 1954 Swallow Doretti Mk I

2-door 2-seater drophead coupé (convertible coupé), petrol (gasoline) 4-cylinder 8-valve straight (inline) engine, OHV (overhead valve, I-head), 1991 cm³ / 121.5 cu in / 121.5 cu in, 67.1 kW / 90.0 hp / 90.0 hp @ 4800 rpm / 4800 rpm / 4800 rpm, 159.0 N·m / 117.3 lb·ft / 117.3 lb·ft @ 3000 rpm / 3000 rpm / 3000 rpm, manual with overdrive 4-speed transmission, rear wheel drive, 169 km/h / 105 mph / 105 mph top speed

Marque (make)	Swallow Doretti	Issued from	1954
Model	Mk I	Issued until
Serie	Mk	Number made
Model family		Body construction
Model code		Body designation
Manufacturer	Swallow Doretti	Country	UK

Marque (make)

Swallow Doretti

Issued from

1954

Model

Mk I

Issued until

Serie

Number made

Model family

Body construction

Model code

Body designation

Manufacturer

Swallow Doretti

Country

Base platform		Number of doors	2
Bodywork type	drophead coupé (convertible coupé)	Number of seats	2
Bodywork designer		Cargo capacity (volume)
Passenger space (volume)		Max. cargo capacity (volume)

Base platform

Number of doors

Bodywork type

drophead coupé (convertible coupé)

Number of seats

Bodywork designer

Cargo capacity (volume)

Passenger space (volume)

Max. cargo capacity (volume)

Length	3962 mm / 156.0 in / 156.0 in	Total (curb) weight	864 kg / 1905 lb / 1905 lb
Width	1549 mm / 61.0 in / 61.0 in	Dry weight
Height	1295 mm / 51.0 in / 51.0 in	Load capacity
Wheelbase	2413 mm / 95.0 in / 95.0 in	Gross (max.) weight
Track front	1219 mm / 48.0 in / 48.0 in	Towing weight
Track rear	1254 mm / 49.4 in / 49.4 in	Weight distribution (front)	52.0 % / 52.0 % / 52.0 %
Ground clearance	152 mm / 6.0 in / 6.0 in	Fuel capacity	57 l / 12.5 UK gal / 15.0 US gal
Length/wheelbase ratio	1.64

Length

3962 mm / 156.0 in / 156.0 in

Total (curb) weight

864 kg / 1905 lb / 1905 lb

Width

1549 mm / 61.0 in / 61.0 in

Dry weight

Height

1295 mm / 51.0 in / 51.0 in

Load capacity

Wheelbase

2413 mm / 95.0 in / 95.0 in

Gross (max.) weight

Track front

1219 mm / 48.0 in / 48.0 in

Towing weight

Track rear

1254 mm / 49.4 in / 49.4 in

Weight distribution (front)

52.0 % / 52.0 % / 52.0 %

Ground clearance

152 mm / 6.0 in / 6.0 in

Fuel capacity

57 l / 12.5 UK gal / 15.0 US gal

Length/wheelbase ratio

1.64

Drag coefficient (Cd, Cx, Cw)		Frontal area (A)	1.71 m² / 18.4 sq ft / 18.4 sq ft (est.)
Aerodynamic coefficient (Cd×A)		Aerodynamic resistance (Aero horse power) at 100 km/h (62 mph)

Drag coefficient (Cd, Cx, Cw)

Frontal area (A)

1.71 m² / 18.4 sq ft / 18.4 sq ft (est.)

Aerodynamic coefficient (Cd×A)

Aerodynamic resistance (Aero horse power) at 100 km/h (62 mph)

Engine Code		Total number of cylinders	4
Engine Type	straight (inline)	Total number of valves	8
Engine Manufacturer	Triumph	Valves per cylinder	2
Engine construction		Bore	83.0 mm / 3.27 in / 3.27 in
Fuel	petrol (gasoline)	Stroke	92.0 mm / 3.62 in / 3.62 in
Fuel details		Bore/Stroke ratio	0.9
Fuel supply	2 SU H4 carbs	Engine displacement	1991 cm³ / 121.5 cu in / 121.5 cu in
Engine Main bearings		Unitary capacity	497.75 cm³/cylinder / 30.375 cu in/cylinder / 30.375 cu in/cylinder
Cam Design	OHV (overhead valve, I-head)	Compression ratio	8.5 : 1
Sump	wet	Max. output power	67.1 kW / 90.0 hp / 90.0 hp at 4800 rpm / 4800 rpm / 4800 rpm
Aspiration	natural	Max. torque	159.0 N·m / 117.3 lb·ft / 117.3 lb·ft at 3000 rpm / 3000 rpm / 3000 rpm
Compressor type	N/A	Maximum rpm
Intercooler	no	Max. net output (power at the wheels)	25.7 kW / 34.5 hp / 34.5 hp (est.)
Coolant	water	Specific output	33.7 kW/l / 0.741 bhp/cu in / 0.741 bhp/cu in
Catalytic converter	no	Specific torque	79.9 N·m/l / 0.70 lb·ft/cu in / 0.70 lb·ft/cu in

Engine Code

Total number of cylinders

Engine Type

straight (inline)

Total number of valves

Engine Manufacturer

Triumph

Valves per cylinder

Engine construction

Bore

83.0 mm / 3.27 in / 3.27 in

Fuel

petrol (gasoline)

Stroke

92.0 mm / 3.62 in / 3.62 in

Fuel details

Bore/Stroke ratio

0.9

Fuel supply

2 SU H4 carbs

Engine displacement

1991 cm³ / 121.5 cu in / 121.5 cu in

Engine Main bearings

Unitary capacity

497.75 cm³/cylinder / 30.375 cu in/cylinder / 30.375 cu in/cylinder

Cam Design

OHV (overhead valve, I-head)

Compression ratio

8.5 : 1

Sump

wet

Max. output power

67.1 kW / 90.0 hp / 90.0 hp at 4800 rpm / 4800 rpm / 4800 rpm

Aspiration

natural

Max. torque

159.0 N·m / 117.3 lb·ft / 117.3 lb·ft at 3000 rpm / 3000 rpm / 3000 rpm

Compressor type

N/A

Maximum rpm

Intercooler

Max. net output (power at the wheels)

25.7 kW / 34.5 hp / 34.5 hp (est.)

Coolant

water

Specific output

33.7 kW/l / 0.741 bhp/cu in / 0.741 bhp/cu in

Catalytic converter

Specific torque

79.9 N·m/l / 0.70 lb·ft/cu in / 0.70 lb·ft/cu in

Transmission type	manual with overdrive	Number of gears	4
Wheel drive	rear wheel drive	Top gear (drive) ratio	0.82
		Final gear (drive) ratio	3.7

Transmission type

manual with overdrive

Number of gears

Wheel drive

rear wheel drive

Top gear (drive) ratio

0.82

Final gear (drive) ratio

3.7

Acceleration 0-50 mph (80 km/h)	7.80 s / 7.80 s / 7.80 s	Top (maximal) speed	169 km/h / 105 mph / 105 mph
Acceleration 0-60 mph (97 km/h)	11.60 s / 11.60 s / 11.60 s	Power-to-weight ratio	104.2 kW/ton / 78.9 bhp/ton / 78.9 bhp/ton
Acceleration 0-100 km/h		Fuel consumption, City (urban)
Acceleration 0-100 mph (160 km/h)		Fuel consumption, Road (extra-urban)
Acceleration 80-120 km/h (50-70 mph) in top		Fuel consumption, Mixed (combined)
Standing ¼mile time		Fuel consumption, Euro
Standing kilometer time		CO₂ emissions
		Range

Acceleration 0-50 mph (80 km/h)

7.80 s / 7.80 s / 7.80 s

Top (maximal) speed

169 km/h / 105 mph / 105 mph

Acceleration 0-60 mph (97 km/h)

11.60 s / 11.60 s / 11.60 s

Power-to-weight ratio

104.2 kW/ton / 78.9 bhp/ton / 78.9 bhp/ton

Acceleration 0-100 km/h

Fuel consumption, City (urban)

Acceleration 0-100 mph (160 km/h)

Fuel consumption, Road (extra-urban)

Acceleration 80-120 km/h (50-70 mph) in top

Fuel consumption, Mixed (combined)

Standing ¼mile time

Fuel consumption, Euro

Standing kilometer time

CO₂ emissions

Range

Engine location	front	Engine alignment	longitudinal
Steering		Steering details
Turns lock-to-lock		Turning circle	11.1 m / 36.4 ft / 36.4 ft
Suspension front	Independent, Coil springs, Wishbone (A-arm, control arm)	Suspension rear	Live axle, Semi-elliptic leaf springs
Wheels front		Wheels rear
Tyres front	5.50 x 15	Tyres rear	5.50 x 15
Brakes front	drum	Brakes rear	drum
Brake diameter front	254 mm / 10.0 in / 10.0 in	Brake diameter rear	229 mm / 9.0 in / 9.0 in
Brakes details		Braked area

Engine location

front

Engine alignment

longitudinal

Steering

Steering details

Turns lock-to-lock

Turning circle

11.1 m / 36.4 ft / 36.4 ft

Suspension front

Independent, Coil springs, Wishbone (A-arm, control arm)

Suspension rear

Live axle, Semi-elliptic leaf springs

Wheels front

Wheels rear

Tyres front

5.50 x 15

Tyres rear

5.50 x 15

Brakes front

drum

Brakes rear

drum

Brake diameter front

254 mm / 10.0 in / 10.0 in

Brake diameter rear

229 mm / 9.0 in / 9.0 in

Brakes details

Braked area

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