Bugatti Type 51 51A

Bugatti Type 51 51AGrand Prix

Identifying Features:
GP chassis, larger radiator than earlier T35, fixed rim alloy wheels; supercharger blow-off valve hole in bonnet is low down in vertical louvres. Parallel radiator section. Magneto on LHS of dash

Years Made
(approx): 1931-35

Number Made:

No of cylinders: 8
Bore x stroke: T51: 60 x 88mm or 100mm; T51A: 60 x 66mm
Capacity: T51: 1991 or 2262cc, T51A: 1493cc
BHP (approx): T51: 160-180; T51A: 130
RPM Limit (prudent): T51: 5000; T51A: 5500
Camshafts: dohc
Valves (per cylinder): 2
Camshaft drive: Front, spur train and bevels
Crankshaft bearings: 3 + 1 Ball, 2 roller, roller rods
Supercharger: Roots
Carburettor: Zenith
Ignition: Dash-mounted magneto
Plugs per cylinder: 1
Firing Order: 1, 5, 2, 6, 3, 7, 4, 8

Type: Wet, multi-plate

Location: Central, separate, 4-speed and reverse
Gear change lever: Outside, Top forward

Rear Axle:
Normal Ratio: 14/54 = 3.86 to 16/54 = 3.38

Wheelbase: 94.5in (2.4m)
Track: 47.25in (1.2m)
Weight (approx): 1650lb (750kg)

Location and Type: 4-wheel, cable operated
Brake drum diameter: 330mm

Type: Cast alloy, integral rim
Tyre size: Original 28 x 5; modern fitment 5.00 x 19

Crossbreeding with Other Types:
Standard T35 GP chassis and body used. T51 engine used in T55. Engine apart from block and camshafts is basically T35

* 2-litre version often known as T51C


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