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Bugatti type 37 37A


4 Cylinder Grand Prix

The successor to the Type 35A was an easy-to-maintain, 1.5-liter, four- cylinder touring model, the Type 37. It was one of Bugatti’s most successful models, selling for an affordable £550. It featured a solid rather than hollow front axle and wire wheels instead of the expensive cast aluminium ones. A starter was optional.

Identifying Features:
GP body, wire wheels, small radiator; detachable alloy wheels usual on T37A. Front engine mounting bolts well back

Years Made
(approx): 1926-30

Number Made:
290 (67 supercharged)

Engine:
No of cylinders: 4
Bore x stroke: 69 x 100mm
Capacity: 1496cc
BHP (approx): T37: 60; T37A: 80-90
RPM Limit (prudent): T37: 4500; T37A: 5000
Camshaft: sohc
Valves (per cylinder): 3
Camshaft drive: Front, bevel
Crankshaft bearings, No. and Type: 5 plain, plain rods
Supercharger (Roots): T37A only
Carburettor: 1 Zenith, or Solex
Ignition: Coil (Magneto on T37A)
Plugs per cylinder: 1
Firing Order: 1, 2, 4, 3

Clutch:
Type: Wet, multi-plate

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

Rear Axle:
Normal Ratio: 14/54 = 3.86

Dimensions:
Wheelbase: 94.5in (2.4m)
Track: 47.25in (1.2m)
Weight (approx): 1600lb (720kg)

Brakes:
Location and Type: 4-wheel cable operated
Brake drums: T37 small, T37A, large, shrouded

Wheels:
Type: Wire, alloy on T37A
Tyre size: original 27 x 4.40; modern fitment 4.50 x 19

Crossbreeding with Other Types:
Chassis and body used on T35, 39 and 51; engine basically T40