Key facts

1925 Bayliss-Thomas 12/27 information summary

What body style?
roadster with 2 seats
How long?
3962 mm
How heavy?
914 kg
What size engine?
1.5 litre, 1496 cm3
How many cylinders?
4, Straight
How much power?
How much torque?


Manufacturer data not found

Excelsior Motor Company Limited

1925 Bayliss-Thomas 12/27 technical specifications


This vehicle has a 1 door roadster body style with a front located engine powering the rear wheels.
The power is produced by a naturally aspirated engine of 1.5 litre capacity. This powerplant features overhead valve valve gear, 4 cylinder layout, and 2 valves per cylinder.
The engine drives the wheels by means of a 3 speed manual 'box.
Its quoted kerb weight is 914 kg.
1925 Bayliss-Thomas 12/27 data
1925 Bayliss-Thomas 12/27 data
Body type2 seater roadster
Number of doors1
dimensions & weights
Wheelbase 2743 108
Track/tread (front) 1321 52
Track/tread (rear) 1321 52
Length 3962 156
Width 1575 62
Ground clearance
length:wheelbase ratio 1.44
Kerb weight 914 kg 2015 lb
Weight distribution
fuel tank capacity
Drag coefficient
Frontal area
engine type naturally aspirated petrol
Engine manufacturer
Engine code
Cylinders Straight 4
Capacity 1.5 litre
1496 cc
(91.292 cu in)
Bore × Stroke 69 × 100 mm
2.72 × 3.94 in
Bore/stroke ratio 0.69
overhead valve (OHV)
2 valves per cylinder
8 valves in total
maximum power output
Specific output
maximum torque
Specific torque
Engine construction
compression ratio
Fuel system 1 Cox-Atmos carburettor
bmep (brake mean effective pressure)
Maximum RPM
crankshaft bearings
Engine coolant Water
Unitary capacity 374 cc
Aspiration Normal
Compressor N/A
Intercooler None
Catalytic converter N
Acceleration 0-80km/h (50mph)
Acceleration 0-60mph
Acceleration 0-100km/h
Acceleration 0-160km/h (100mph)
Standing quarter-mile
Standing kilometre
Maximum speed
Power-to-weight ratio
Weight-to-power ratio
fuel consumption
Fuel consumption
universal consumption (calculated from the above)
litres per 100km
km per litre
Carbon dioxide emissions
Carfolio Calculated CO2 ?
VED band (UK)
CO2 Effizienz (DE)
Engine position front
Engine layout longitudinal
Drive wheels rear wheel drive  
Torque split N/A
turns lock-to-lock
Turning circle
Front suspension
Rear suspension
Wheel size front
Wheel size rear
Tyres front 720 x 120
Tyres rear 720 x 120
Brakes F/R
Front brake diameter
Rear brake diameter
Gearbox 3 speed manual
Top gear ratio 1
Final drive ratio 4.50
general ID296186
Production total
Model code
Model family
RAC rating 11.8
Insurance classification No information available
Tax band No information available
1925 Bayliss-Thomas 12/27 added 2012-11-28.
Last modified 2013-02-28.

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1925 Bayliss-Thomas 12/27

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