Bugatti Type 45 1929-1930
The 16-cylinder Type 45 racing car and similar Type 47 "Grand Sport" were to become a new generation of cars from Bugatti.
The engine, a 3-valve SOHC design, was based on the 3-valve straight-8 from the Type 35. Two versions were made: A 3.0 L (2986 cc/182 in³) version fitted to a Type 47 prototype shared the Type 36's 60 by 66 mm dimensions, while the Type 45 prototype used a unique 84 mm stroke for 3.8 L (3801 cc/231 in³). Output would have been 200 to 250 hp (149 to 186 kW) with a Roots-type supercharger in play.
The entire vehicle was unique, including its chassis. The Type 45 used a 102.2 in (2596 mm) wheelbase, while the Type 47 was stretched to 108.3 in (2750 mm). Both had a 49.2 in (1250 mm) track.
Specifications
Bugatti Type 45 47
- Bugatti Type 45 47 16-cylinder Competition (45 Racing, 47 Grand Sport)
- Identifying Features: Engine, wide rear spring mounting, deep chassis frame
- Years Made (approx): 1929-30
- Number Made: 2
Engine:
- No of cylinders: 16
- Bore x stroke: T47 60 x 66mm; T45 60 x 84mm
- Capacity: 2986cc, 3801cc
- BHP (approx): 200, 250
- RPM Limit (prudent): 5000
- Camshafts: 2 x sohc
- Valves (per cylinder): 3
- Camshaft drive: Rear, spur train
- Crankshaft bearings: full roller mains, plain central, plain rods, cranks geared together
- Supercharger (Roots): Twin, rear mounted
- Carburettor: 2 Zenith
- Ignition: 2 Magnetos
- Plugs per cylinder: 1
Clutch:
- Type: Multi-disc
Gearbox:
- Location: Central, Separate, 4-speed and reverse
Rear Axle:
- Normal Ratio: T45: 15/42 = 2.8
- T47: 13/54 = 4.15
Dimensions:
- Wheelbase: T45: 102.2in (2.60m)
- T47: 108.3in (2.75m)
- Track: 49.2in (1.25m)
- Chassis Weight (approx): 2000lb (900kg)
Brakes:
- Location and Type: 4-wheel, cable operated
Wheels:
- Type: Cast alloy GP
- Tyre size: original 28 x 4.75; modern fitment 5.00 x 19
Crossbreeding with Other Types:
- Unique apart from axles and some engine parts