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Brescia Bugatti type 13, 22, 23

Brescia, or Brescia Modifiť

Ten years after its introduction, Bugatti's three car line-up was ready for it second major revision. Where the 1913 revisions concentrated on the chassis and bodywork, the second concentrated on the engine. As one of the first engines in history, the new engine featured 4 valves per cylinder. The 16-valve engine was originally developed in 1914, but the First World War interfeered and Ettore Bugatti buried the engines.

In 1920 the first outing of the 16-valve engines was a big success with Friderich winning the French Voiturette Grand Prix at LeMans. Even more successful was Bugattis clean sweep of the first four places at Brescia in 1921. In honour of this memorable victory all 16-valve engined cars were dubbed Brescia. Like with the 8-valve engines the Brescia was available in three wheelbases.

One of the Brescia's few flaws was the lack of front brakes. This was solved in 1924 when front drum brakes became a standard feature

Identifying features:
H-section front axle, front brakes unusual, carburettor on left hand side, exhaust right hand side - a unique arrangement on a Bugatti

Years Made (approx): 1914-26

Number made: 2,000

No of cylinders: 4
Bore x stroke: 66, 68, 69 x 100mm
Capacity: 1368, 1453, 1496cc
BHP (approx): 30+
RPM limit (prudent): 4000 or even 4500 on a good Brescia
Camshaft: sohc
Valves (per cylinder): 4
Camshaft drive: Front, bevel
Crankshaft bearings, No. and Type: Early, 3 plain; later 2 BB, 1 plain; plain rods*
Carburettor: 1 or 2 Zenith
Ignition: 1 or 2 Magnetos, usually SEV
Plugs per cylinder: 1 or 2
Firing Order: 1, 2, 4, 3

Clutch: Type: Wet, multi-plate

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

Rear Axle: Normal Ratio: 14/45, 13/45, 12/45 = 3.2, 3.46, 3.75

Dimensions:   T13 T22 T23
Wheelbase: m 2.0** 2.4*** 2.55
  in 78.75 94.5 100.4

Track: 45.3in (1.15m)
Chassis weight (approx): 1350lb (610kg)

Location and Type: Foot, transmission; right hand, rear: FWB in 1926

Type: wire
Tyre size: original 710 x 90; modern fitment 4.50 x 19

Crossbreeding with Other Types:
Same chassis as 8-valve cars; long chassis used on early T30; 1924/6 Brescia axles and radiator similar to T30

* Ball bearing type can be identified by larger housing boss at rear of crankcase

** Sometimes quoted as 1967mm (77.5in)

*** Sometimes quoted as 2417mm (95.2in)