1948 Atomo 250 B

The Atomo 250 B is a rear wheel drive vehicle, with the engine positioned in the rear, and a 2 door minicar body. It's powered courtesy of a naturally aspirated engine of 0.3 litre capacity. This unit features two stroke valve gear, 2 cylinder layout,. It produces 9.9 bhp (10 PS/7.4 kW) of power at 4800 rpm, and maximum torque of 18.8 N·m (13.9 lb·ft/1.9 kgm) at 1800 rpm. This power is transmitted to the wheels through a 3 speed manual gearbox. Quoted weight at the kerb is 210 kg. Maximum speed quoted is 76 km/h (47 mph).
Full specs

Body type
2 door minicar with 2 seats
Length
3070 mm
Weight
210 kg
Engine type
naturally aspirated petrol
Engine size
0.3 litre
Cylinders
2, Straight
Power
10 PS / 9.9 bhp / 7.4 kW @ 4800 rpm
Torque
18.8 Nm / 13.9 ft.lb / 1.9 kgm @ 1800 rpm
Top speed
76 km/h / 47 mph

1948 Atomo 250 B specifications

1948 Atomo 250 B data
bodywork
Français Deutsch Nederlands Italiano Español English
Body type	2 seater minicar
Number of doors	2
Designer
dimensions & weights
Wheelbase	2070 mm	81.5 inches
Track/tread (front)	1160 mm	45.7 inches
Track/tread (rear)
Length	3070 mm	120.9 inches
Width	1300 mm	51.2 inches
Height	1300 mm	51.2 inches
Ground clearance
length:wheelbase ratio	1.48
Kerb weight	210 kg	463 lb
Weight distribution
fuel tank capacity	15 litres	3.3 [4] UK [US] gal.
aerodynamics
Drag coefficient
Frontal area
CdA
Powertrain
engine type	naturally aspirated petrol
Engine manufacturer
Engine code
Cylinders	Straight 2
Capacity	0.3 litre 256 cc (15.622 cu in)
Bore × Stroke	53 × 58 mm 2.09 × 2.28 in
Bore/stroke ratio	0.91
Valve gear	two stroke (TS)
maximum power output	10 PS (9.9 bhp) (7.4 kW) at 4800 rpm
maximum torque	18.8 Nm (13.9 ft·lb) (1.9 kgm) at 1800 rpm
Specific output	28.8 kW/litre 39.2 ps/litre 38.7 bhp/litre 0.63 bhp/cu in
Specific torque	73.44 Nm/litre 0.89 ft·lb/cu³
Engine construction
Lubrication
compression ratio	6.5:1
Fuel system	1 Weber 22 OTS carburettor
bmep (brake mean effective pressure)	461.4 kPa (66.9 psi)
Maximum RPM
crankshaft bearings
Engine coolant	Air
Unitary capacity	128 cc
Aspiration	Normal
Compressor	N/A
Intercooler	None
Catalytic converter	N
performance
Acceleration 0-80km/h (50mph)
Acceleration 0-60mph
Acceleration 0-100km/h
Acceleration 0-160km/h (100mph)
Standing quarter-mile
Standing kilometre
Maximum speed	76 km/h (47 mph)
Power-to-weight ratio	Higher is better 47.8 PS/tonne (1000 kg) 0.05 PS/kg 35.15 kW/tonne (1000 kg) 0.04 kW/kg 47.14 bhp/tonne (1000 kg) 0.05 bhp/kg 0.02 bhp/lb
Weight-to-power ratio	Lower is better 28.45 kg/kW 47.52 lb/bhp
fuel consumption
Fuel consumption
universal fuel consumption (calculated from the above)
litres/100km
km/litre
UK MPG
US MPG
Carbon dioxide emissions
Carbon dioxide emissions
Carfolio Calculated CO₂ ^?
VED band (UK)
CO₂ Effizienz (DE)
chassis
Engine position	rear
Engine layout	longitudinal
Drive wheels	rear wheel drive
Torque split	N/A
Steering
turns lock-to-lock
Turning circle
Front suspension
Rear suspension
Wheel size front
Wheel size rear
Tyres front	4.00-15
Tyres rear	4.00-15
Brakes F/R
Front brake diameter
Rear brake diameter
Braked area
Gearbox	3 speed manual
Top gear ratio	1
Final drive ratio
general
Carfolio.com ID	305525
Production total
Model code
RAC rating	3.5
Insurance classification	No information available
Tax band	No information available
1948 Atomo 250 B added 2013-02-04. Last modified 2020-02-02.