1938 Velocette KTT Mk VIII Technical Analysis & Specification Breakdown
At the heart of the 1938 Velocette KTT Mk VIII sport motorcycle, Velocette utilizes a 348.4 cc (21.3 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 35 HP (25.5 kW) at 5,800 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 100.5 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the KTT Mk VIII measures 125 kg (276 lbs) dry, translating to a power-to-weight ratio of 0.28 HP/kg (3.57 kg per horsepower). The 11.4-liter (3 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 185 km/h (115 mph).
Within MotoLibrary's Velocette archive, this model family spans 13 indexed model years from 1938 to 1950, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
100.5 HP/L
Power-to-Weight
0.28 HP/kg (3.57 kg/HP)
Engine
Displacement348.4 ccm (21.26 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power35.0 HP (25.5 kW)) @ 5800 RPM
Compression7.8:1
Bore x Stroke74.0 x 81.0 mm (2.9 x 3.2 inches)
Fuel SystemCarburettor. Amal
Fuel ControlOverhead Valves (OHV)
IgnitionBobine
LubricationDry sump
CoolingAir
Transmission
Final DriveChain (final drive)
ClutchWet multiplate
Performance
Top Speed185.0 km/h (115.0 mph)
ExhaustSingle -Chrome
Chassis
Frame TypeSingle cradle
Wheels & Brakes
Front BrakesExpanding brake (drum brake)
Front Brake Ø178 mm (7.0 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø178 mm (7.0 inches)
WheelsSpoked
Dimensions & Weight
Dry Weight125.0 kg (275.6 pounds)
Power/Weight0.2800 HP/kg
Fuel Capacity11.40 litres (3.01 US gallons)
Other
StarterKick
Color OptionsMulticolored. Black with gold pin striping
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
